Enhancing the catalytic activity of catalysts is a core objective in their design and synthesis processes,and the accessibility of active sites is one of the crucial factors determining catalyst activity.Polyoxometala...Enhancing the catalytic activity of catalysts is a core objective in their design and synthesis processes,and the accessibility of active sites is one of the crucial factors determining catalyst activity.Polyoxometalate-based metal-organic complexes(POMOCs)with well-defined structures,which combine the advantages of POMs and MOCs,may offer the possibility to construct catalysts with highly accessible active sites.In this study,a series of POMOCs were successfully designed and synthesized using different POM templates,including[CoII1.5(L)1.5(PMo12O40)(H_(2)O)4]·3H_(2)O(Co-PMo12),[CoII1.5(L)1.5(PW12O40)(H_(2)O)4]·3H_(2)O(Co-PW12),[CoII2(L)2-(SiW12O40)(H_(2)O)4]·11H_(2)O(Co-SiW12),and H[CoII2.5(L)3-(P2W18O62)(H_(2)O)8]·10H_(2)O(Co-P2W18),which were characterized by Fourier transform infrared spectroscopy,powder X-ray diffraction,and single crystal X-ray diffraction.The differences in catalytic activity among the four POMOCs for olefin epoxidation were attributed to the distinct accessibility of Co(II)sites upon thermal activation.Among them,Co-P2W18 achieved a remarkable 99%yield of 1,2-epoxycyclooctane within 3 h at room temperature using O_(2)as the oxidant,owing to its highly accessible unsaturated Co(II)sites.Co-P2W18 exhibits significantly superior catalytic activity for the cyclooctene epoxidation reaction compared to most reported catalysts.Additionally,the reaction mechanism was investigated using density functional theory.展开更多
This study presents a novel polyoxometalate(POM)constructed crystalline inorganic framework,featuring a 2D layered architecture with irregular porosity and inherent proton sources.This unique configuration establishes...This study presents a novel polyoxometalate(POM)constructed crystalline inorganic framework,featuring a 2D layered architecture with irregular porosity and inherent proton sources.This unique configuration establishes an intrinsic hydrogen bonding network that facilitates proton hopping(Grotthuss mechanism),achieving a[100]directional proton conductivity of 1.75×10^(-3)S cm^(-1)under a low relative humidity(RH)of 35%at 298 K.Notably,under elevated conditions(338 K,95%RH),it attains a superprotonic conductivity of 1.61 S cm^(-1),representing one of the highest values recorded for framework materials to date.Analysis of the molecular structure,pore geometry characteristics and topological connectivity,and water vapor adsorption experiment(offering proton diffusion coefficient),indicates that the exceptional water-mediated proton dynamics stem from the interlayer S-shaped irregular pore channels,which probably induce a siphon-like effect to significantly enhance the transport of hydrated protons under the vehicle mechanism.This work not only proposes a POM strategy for constructing 2D inorganic frameworks but also reveals the irregular pore channel-enhanced proton dynamics,providing new insights into the optimization of proton conductors.展开更多
A core-shell type Co_(19)-added polyoxometalate H_(17)Na_(4)Cs_(21)[Co_(19)(μ_(3)-OH)_(12)(A-α-SiW_(10)O_(37))_(6)]·8 Cl·12H_(2)O(1)has been made under hydrothermal conditions guided by the lacunary direct...A core-shell type Co_(19)-added polyoxometalate H_(17)Na_(4)Cs_(21)[Co_(19)(μ_(3)-OH)_(12)(A-α-SiW_(10)O_(37))_(6)]·8 Cl·12H_(2)O(1)has been made under hydrothermal conditions guided by the lacunary directing synthetic strategy.Single crystal X-ray diffraction(SXRD)has shown that 19 Co^(2+)are arranged in a flat plane through edge sharing in a mode of 3-4-5-4-3,forming a core-shell type polyanion cluster{Co_(19)(SiW_(10))_6}with a diameter of approximately 2.24 nm.Visible-light-driven photocatalytic hydrogen evolution performance studies have shown that 1 is an efficient heterogeneous water reduction catalyst(WRC)with the H_(2)evolution rate of 2902.5μmol h^(-1)g^(-1).Moreover,the cycle tests indicated that 1 was also a good heterogeneous catalyst.展开更多
For a long time,researchers have been fascinated by the structurally diverse and high-performance characteristics of polyoxometalates(POMs).Modifying POMs with various types and properties of metals has broadened thei...For a long time,researchers have been fascinated by the structurally diverse and high-performance characteristics of polyoxometalates(POMs).Modifying POMs with various types and properties of metals has broadened their applications in fields such as magnetism,luminescence,and catalysis.However,despite the discovery of numerous POM structures doped with transition metal ions,the development of aluminum(Al)as aⅢA group metal in the POM field has been slow.Aluminum,the most abundant metal in nature,offers innate electron-deficient properties that,when combined with highly charged POMs,could introduce novel structures and excellent functionalities like proton conduction to this field.Therefore,this review will address the gap in summarizing Al-containing POMs by categorizing and summarizing the synthesis,structural characteristics,and properties of Al-containing POMs,aiming to provide a theoretical foundation for exploring POM structures doped with Al atoms.The review also analyzes and forecasts the prospects in this field.展开更多
Improving the surface atoms utilization efficiency of catalysts is extremely important for large-scale H_(2)production by electrochemical water splitting,but it remains a great challenge.Herein,we reported two kinds o...Improving the surface atoms utilization efficiency of catalysts is extremely important for large-scale H_(2)production by electrochemical water splitting,but it remains a great challenge.Herein,we reported two kinds of Mo O_(3)-polyoxometalate hybrid nanobelt superstructures(MoO_(3)-POM HNSs,POM=PW_(12)O_(40)and Si W_(12)O_(40))using a simple hydrothermal method.Such superstructure with highly uniform nanoparticles as building blocks can expose more surface atoms and emanate increased specific surface area.The incorporated POMs generated abundant oxygen vacancies,improved the electronic mobility,and modulated the surface electronic structure of MoO_(3),allowing to optimize the H^(*)adsorption/desorption and dehydrogenation kinetics of catalyst.Notably,the as-prepared MoO_(3)-PW_(12)O_(40)HNSs electrodes not only displayed the low overpotentials of 108 mV at 10 mA/cm^(2)current density in 0.5 mol/L H_(2)SO_(4)electrolyte but also displayed excellent long-term stability.The hydrogen evolution reaction(HER)performance of MoO_(3)-POM superstructures is significantly better than that of corresponding bulk materials MoO_(3)@PW_(12)O_(40)and Mo O_(3)@Si W_(12)O_(40),and the overpotentials are about 8.3 and 4.9 times lower than that of single Mo O_(3).This work opens an avenue for designing highly surface-exposed catalysts for electrocatalytic H_(2)production and other electrochemical applications.展开更多
In the field of Raman spectroscopy detection,the quest for a non–noble metal,recyclable,and highly sensitive detection substrate is of utmost importance.In this work,a new crystalline and noble metal–free substrate ...In the field of Raman spectroscopy detection,the quest for a non–noble metal,recyclable,and highly sensitive detection substrate is of utmost importance.In this work,a new crystalline and noble metal–free substrate of[Bi(DMF)_(8)][PMo_(12)O_(40)](Bi–PMo_(12))is designed,which is composed of[PMo_(12)O_(40)]^(3−)and solvated[Bi(DMF)_(8)]^(3+)cations.Mechanistic studies have revealed that Raman scattering quenching phenomenon arises from two main factors.Firstly,it arises from the absorption of the scattered light due to the transition of a single electron in the reduced state of MoV between 4d orbitals.Secondly,after the interaction between the substrate and hydrazine,the surface undergoes varying degrees of roughening,leading to an impact on the scattered light intensity.These two effects collectively contribute to the detection of low concentrations of N_(2)H_(4).As a result,Bi–PMo_(12)opens up a novel Raman scattering quenching mechanism to realize the detection of reduced N_(2)H_(4)small molecules.A remarkably low detection limit of 4.5×10^(−9)ppm for N_(2)H_(4)is achieved on the Bi–PMo_(12)substrate.This detection has a lower concentration than the currently known SERS detection of N_(2)H_(4).Moreover,Bi–PMo_(12)can be recovered and reused through recrystallization,achieving a recovery rate of up to ca.51%.This study reveals the underlying potential of crystalline polyoxometalate materials in the field of Raman detection,thus opening up new avenues for highly sensitive analysis using Raman techniques.展开更多
With several favorable properties,including flexibility,biocompatibility,and conductivity,conductive hydrogels are one of the most promising flexible sensing materials and are expected to be used in areas such as wear...With several favorable properties,including flexibility,biocompatibility,and conductivity,conductive hydrogels are one of the most promising flexible sensing materials and are expected to be used in areas such as wearable devices,health monitoring,and electronic skin.However,water in hydrogels freezes at sub-zero temperatures,which greatly affects the performance of hydrogels at low temperatures.Therefore,it remains a challenge to prepare conductive hydrogels that can maintain their performance at low temperatures.In this work,we developed a series of polyoxometalate-based anti-freezing hydrogels with high conductivity by constructing a semi-interpenetrating network using polyacrylamide and sodium alginate,and then introducing H_(3)PW_(12)O_(40)(HPW)and glycerol into it via a facile soaking strategy.Among the obtained anti-freezing hydrogels,PSWG-50%hydrogel has the proton conductivity of 0.325 S·cm^(−1) at room temperature and can maintain high proton conductivity over a wide temperature range from−20 to 65℃.Based on these advantages,PSWG-50%hydrogel has been used in flexible sensors to monitor human movement,such as limb bending.Whether in mild or cold environments,PSWG-50%hydrogel shows great potential in the field of flexible sensor.展开更多
Persistent illumination inevitably leads to the formation of Pb^(0)and I^(0)species in perovskite film,serving as non-radiative recombination centers and thus limiting the process of the commercial application.Herein,...Persistent illumination inevitably leads to the formation of Pb^(0)and I^(0)species in perovskite film,serving as non-radiative recombination centers and thus limiting the process of the commercial application.Herein,we propose a redox strategy to dynamically eliminate the defective Pb^(0)and I^(0)generated during device operation using polyoxometalate(POM)as an additive.Benefiting from the reversible W^(5+/6+)redox activity and the structural stability when accepting and donating electrons from perovskite film,POMs play a role of the redox shuttle that oxidizes Pb^(0)into Pb^(2+)and reduces I^(0)into I^(-),consequently inhibiting the formation of Pb^(0)and I^(0)species and reducing the film defects,which benefits the improvement of stability and performance.As a result,the efficiency of carbon-based all-inorganic CsPbI_(2)Br cell is significantly improved to 15.12% and the efficiency of the organic-inorganic hybrid(Cs_(0.05)MA_(0.05)FA_(0.9))Pb(I_(0.93)Br_(0.07))_(3)cell is also increased to 24.20%.More importantly,the target device shows superior stability under air conditions after storage for 1500 h,high temperature after 750 h,and persistent irradiation over200 h,respectively,providing a new method for efficient and stable perovskite solar cells.展开更多
Comparing to the conventional polyoxometalate(POM)-templated silver(Ag)clusters,asymmetrically covered POM-templated Ag clusters have been rarely reported.In this work,a new Ag cluster,H[Co(SiW_(11)O_(39))Co_(4)(OH)_(...Comparing to the conventional polyoxometalate(POM)-templated silver(Ag)clusters,asymmetrically covered POM-templated Ag clusters have been rarely reported.In this work,a new Ag cluster,H[Co(SiW_(11)O_(39))Co_(4)(OH)_(3)(NO_(3))_(2)(SiW_(9)O_(34))@Ag_(37)(^(t)BuC≡C)_(23)(NO_(3))_(2)(DMF)_(3)](Ag_(37)Co_(5)),has been successfully prepared using a facile solvothermal approach.Such a unique asymmetrical architecture is ascribed to the uneven charge distribution of the in situ generated[Co(SiW_(11)O_(39))]^(6-)and[Co_(4)(OH)_(3)(NO_(3))_(2)(SiW_(9)O_(34))]^(7-)moieties,leading to the asymmetrical coverage of alkynyl-protected Ag shell.Various physicochemical and catalytic studies revealed that the resulting solid-state Ag_(37)Co_(5) crystals exhibited interesting temperature-dependent photoluminescence property,efficient and recyclable photothermal conversion ability,and good catalytic activity towards the detoxication of 4-nitrophenol.展开更多
Efficient removal of antibiotics is of great significance for the sustainability of aquatic ecosystems.In this work,a new polyoxometalate-based metal-organic hybrid material[Ag_(3)L_(0.5)(HSiW_(12)O_(4)0)]·2C_(2)...Efficient removal of antibiotics is of great significance for the sustainability of aquatic ecosystems.In this work,a new polyoxometalate-based metal-organic hybrid material[Ag_(3)L_(0.5)(HSiW_(12)O_(4)0)]·2C_(2)H_(5)OH·2CH_(3)CN(Ag-L-SiW_(12))was prepared by using Keggin-type polyoxometalate anion and thiacalix[4]arene-based ligand(L)via solvothermal method.Subsequently,a composite heterojunction Ag-L-SiW_(12)@BiVO_(4)photoanode was fabricated by loading Ag-L-SiW_(12)on the surface of BiVO_(4).The photoelectrocatalytic degradation performance of ciprofloxacin(CIP)was explored under the simulated solar radiation.Remarkably,the CIP degradation efficiency reached 93%within 240 min using the optimal Ag-LSiW_(12)@BiVO_(4)photoanode,which is approximately 2 and 23 times those of pristine BiVO_(4)and Ag-L-SiW_(12),respectively.Furthermore,density functional theory(DFT)calculations were conducted to elucidate the role of Ag-L-SiW_(12)during the photoelectrocatalytic process.This work offers an example of the efficient composite photoelectrocatalysts for the treatment of antibiotic wastewater.展开更多
The polysulfides shuttle effect,sluggish sulfur redox kinetics and the corrosion of the Li anode have become important factors limiting the commercial application of lithium-sulfur batteries(LSBs).Herein,the polyoxome...The polysulfides shuttle effect,sluggish sulfur redox kinetics and the corrosion of the Li anode have become important factors limiting the commercial application of lithium-sulfur batteries(LSBs).Herein,the polyoxometalate(POM)nanoclusters with high catalytic activity and cobalt selenide with strong polarity are initially complemented to construct a PMo_(12)/CoSe_(2)@NC/CNTs multifunctional separator that can simultaneously solve the above problems.A series of experimental and theoretical results demonstrate that the Keggin-type POM,H_(3)PMo_(12)O_(40)nH_(2)O(PMo_(12))nanoclusters could function as catalytic centers for sulfur-involved transformations,with the CoSe_(2)nanoparticles serving as adsorption sites for soluble polysulfides.Accordingly,the assembled battery with the PMo_(12)/CoSe_(2)@NC/CNTs modified separator achieves an initial discharge capacity of 1263.79 mA h g^(-1),maintaining 635.77 mA h g^(-1),with a capacity decay rate of 0.06%per cycle after 500 cycles at 3C.This work provides a strategic approach for incorporating POM nanoclusters with polar periodic nanomaterials in LSB separators,contributing to the development of multifunctional separator materials,thus promoting the advancement of energy storage systems.展开更多
Constructing clus ter heterostructures with strongly coupled interfaces is of great importance to accelerating the catalytic reactions that involve multiple intermediates.Herein,a strongly coupled cluster heterostruct...Constructing clus ter heterostructures with strongly coupled interfaces is of great importance to accelerating the catalytic reactions that involve multiple intermediates.Herein,a strongly coupled cluster heterostructure composed of platinum and molybdenum carbide(Pt@Mo_(2)C)derived from polyoxometalate clusters is designed to achieve excellent alkaline hydrogen evolution reaction.The Pt@Mo_(2)C cluster exhibits strong electronic interactions between Pt and Mo_(2)C,working together to facilitate the H_(2)O dissociation by concurrently binding intermediates(Pt-H*and Mo-OH*),thus accelerating the kinetics of the rate-determining Volmer step.Theoptimized Pt@Mo_(2)C exhibits a high mass activity of12.1 A·mgpt^(-1),19.2 times higher than that of 20%Pt/C in alkaline media.Moreover,it can be stabilized at a current density of 100 mA·cm^(-2)for more than 200 h.This work demonstrated the superiority of the cluster heterostructures and co-catalytic effect towards the development of highly efficient electrocatalysts.展开更多
Green synthesis of drugs is of paramount importance for current public health and a prerequisite to new drugs exploiting.Nowadays,novel strategies of disease diagnosis and therapies are in blooming development as rema...Green synthesis of drugs is of paramount importance for current public health and a prerequisite to new drugs exploiting.Nowadays,novel strategies of disease diagnosis and therapies are in blooming development as remarkable advances have been achieved which are all highly depended on drug development.Under the current requirements to high production capacity and novel synthesis methods of drugs,green synthesis based on strategies with different ways of empowering,advanced catalysts and unique reaction equipment are attracting huge attention and of great challenging.Higher quality products and environmentally friendly synthesis conditions are becoming more and more important for manufacturing process which has new requirements for catalyst materials and synthesis processes.Polyoxometalates(POMs)are class of transition metals-oxygen clusters with precise molecular structures and superior physicochemical properties which have made longstanding and important applications upon research community of functional materials,catalysis and medicine.In this review,the recent advances of polyoxometalates based strategies for green synthesis of drugs are summarized including POMs based catalysts,alternative reaction equipment based novel synthesis protocols.The significance of POMs to pharmaceutical and industrial field is highlighted and the related perspective for future development are well discussed.展开更多
Nanozymes,as a new generation of artificial enzymes,exhibit similar chemical properties,catalytic efficiency,and reaction kinetics to natural enzymes.Nanozymes can offer several advantages over natural enzymes,includi...Nanozymes,as a new generation of artificial enzymes,exhibit similar chemical properties,catalytic efficiency,and reaction kinetics to natural enzymes.Nanozymes can offer several advantages over natural enzymes,including the decreased cost,the increased stability,and the enhanced catalytic activity.These advantages have positioned nanozymes as a research focus in the fields of chemistry,materials and biomedicine.Polyoxometalates(POMs)and their composites have been found to possess excellent catalytic capabilities as peroxidase mimics.Given this,this review aims to provide a comprehensive overview of the POM-based nanozymes,covering their structural categorization,evolution,and various applications over the past decade.The dynamic nature of this field would promise the intriguing challenges and opportunities in the future.Additionally,we address the existing issues with the POM-based peroxidase-like enzymes and suggest the potential directions for future research.This review would serve as a valuable resource for researchers seeking to develop the improved therapeutic and diagnostic technologies using the POM-based nanozymes,thereby advancing the fields of biochemistry and materials science.展开更多
Noble metal nanoclusters have attracted great scientific interests due to their tempting properties and applications.Significant strides have been made in recent years to synthesis atomically precise nanoclusters by u...Noble metal nanoclusters have attracted great scientific interests due to their tempting properties and applications.Significant strides have been made in recent years to synthesis atomically precise nanoclusters by utilizing polyoxometalates as protecting ligands.Remarkably,the group of Professor Suzuki from the University of Tokyo has made a great contribution in this field.Here we spotlight on four related papers in this area and present a brief highlight of these publications.展开更多
Production o f aromatics from lignin has attracted much attention. Because of the coexistence of C-O and C-C bonds and their complex combinations in the lignin macromolecular network, a plausible roadmap for de...Production o f aromatics from lignin has attracted much attention. Because of the coexistence of C-O and C-C bonds and their complex combinations in the lignin macromolecular network, a plausible roadmap for developing a lignin catalytic decomposition process could be developed by exploring the transformation mechanisms of various model compounds. Herein, decomposition of a lignin model compound, 2-phenoxyacetophenone （2-PAP）, was investigated over several ce-sium-exchanged polyoxometalate （Cs-POM） catalysts. Decomposition of 2-PAP can follow two dif-ferent mechanisms： an active hydrogen transfer mechanism or an oxonium cation mechanism. The mechanism for most reactions depends on the competition between the acidity and redox proper-ties of the catalysts. The catalysts of POMs perform the following functions： promoting active hy-drogen liberated from ethanol and causing formation of and then temporarily stabilizing oxonium cations from 2-PAP. The use of Cs-PMo, which with strong redox ability, enhances hydrogen libera-tion and promotes liberated hydrogen transfer to the reaction intermediates. As a consequence, complete conversion of 2-PAP （〉99%） with excellent selectivities to the desired products （98.6% for phenol and 91.1% for acetophenone） can be achieved.展开更多
The design and syntheses of metal-organic cages(MOCs)based on polyoxometalates(POMs)building blocks have attracted increasing attention due to their intriguing molecular architectures and physicochemical properties.In...The design and syntheses of metal-organic cages(MOCs)based on polyoxometalates(POMs)building blocks have attracted increasing attention due to their intriguing molecular architectures and physicochemical properties.In this work,we have successfully synthesized and systematically characterized a tetrahedral polyoxometalate-based organic cage(POC),K_(3)Na_(17)H_(12)[(C_(4)H_(6)O_(6))_(6)[Ni_(4)(OH)_(3)(A-α-SiW_(9)O_(34))]_(4)]·96H_(2)O(Ni_(16)L_(6)(SiW_(9))_(4)),using tritopic Ni_(4)-substituted Keggin cluster(Ni_(4)SiW_(9))as nodes and flexible L-(+)-tartaric acid ligands as linkers.The resulting POC tetrahedron has been firstly investigated as efficient catalyst for visible-light-driven hydrogen production,achieving a turnover number of 15,500 after 96-h photocatalysis.Such high catalytic performance of Ni_(16)L_(6)(SiW_(9))_(4)POC catalyst could be attributed to its unique cage structure,thereby offering more efficient catalytic component accessibility.In addition,spectroscopic analyses illustrated the photocatalytic mechanism and the structural stability of the TBA-Ni_(16)L_(6)(SiW_(9))_(4)catalyst during the photocatalytic process.展开更多
Polyelectrolytes are charged polymers comprising macromolecules in which substantial portions of the constituent units contain cationic(e.g.,pyridinium,ammonium)or anionic(e.g.,sulfonate,carboxylate)groups,which posse...Polyelectrolytes are charged polymers comprising macromolecules in which substantial portions of the constituent units contain cationic(e.g.,pyridinium,ammonium)or anionic(e.g.,sulfonate,carboxylate)groups,which possess special functions from the features of counterions,such as dissociation to charged species,mechanical stability,phase behavior,etc.Therefore,functional polyelectrolytes have been widely applied in many fields.In this perspective,we present some progresses in the studies of poly(polyoxometalate)s,denoted as poly(POM)s,as a kind of new charged polymers/polyelectrolytes,by covalent bonding between the inorganic polyoxometalate(POM)clusters and the organic polymer chains.According to the distinct positions of POMs in polymer chain and functions of poly(POM)s,they are divided into the following four categories:crosslinked poly(POM);side-chain poly(POM);backbone poly(POM),including poly(POM)-conjugated polymer hybrid and block poly(POM)-polymer;and POM-based covalent organic framework(PCOF).This perspective introduces the synthesis methods of poly(POM)polyelectrolytes and their macromolecular and aggregate structural characteristics,while also focusing on their properties and functions.Their application areas include catalysis,thermal resistance,optical functions,fuel cells and batteries,etc.展开更多
Polyoxometalates(POMs)are molecular metal-oxide clusters with precise chemical composition and architecture.Besides their bioactivities,electron-rich POMs have shown potential for enhancing synergistic therapy,such as...Polyoxometalates(POMs)are molecular metal-oxide clusters with precise chemical composition and architecture.Besides their bioactivities,electron-rich POMs have shown potential for enhancing synergistic therapy,such as photothermal therapy(PTT),photodynamic therapy(PDT),and chemo-dynamic therapy(CDT),through near-infrared region(NIR)absorption and redox reactions.展开更多
A series of novel photocatalysts, H3PW12O40-Y-TiO2 nanocomposites with different H3PW12O40 loading levels （10%-40%） were prepared by impregnation method. And the Y-TiO2 support, doped with yttrium, was synthesized v...A series of novel photocatalysts, H3PW12O40-Y-TiO2 nanocomposites with different H3PW12O40 loading levels （10%-40%） were prepared by impregnation method. And the Y-TiO2 support, doped with yttrium, was synthesized via sol-gel technique. The prepared catalysts were characterized by Fourier transform infrared spectroscopy （FT-IR）, powder X-ray diffraction （XRD）, nitrogen adsorption-desorption analysis and scanning electron microscopy （SEM）. The processes allowed obtaining Keggin structure and crystallized anatase with large BET surface area as well as uniform distribution. The effects of H3PW12O40 loadings, catalyst dose, initial pH and concentration of dye solution on the degradation kinetics of methyl orange under UV light （λ≥365 nm） were discussed. Kinetics studies showed that the photocatalytic degradation of methyl orange fitted the apparent first-order reaction. Methyl orange was totally degraded in 21 min under optimum conditions： 20% loading, 0.03 g dose and pH 1.0. The catalyst was stable and easily to be separated from reaction system for recovery.展开更多
基金financially supported by the National Natural Science Foundation of China(22271021,21971024,and 22201021)the Natural Science Foundation and Education Department of Liaoning Province(LJ232410167011)。
文摘Enhancing the catalytic activity of catalysts is a core objective in their design and synthesis processes,and the accessibility of active sites is one of the crucial factors determining catalyst activity.Polyoxometalate-based metal-organic complexes(POMOCs)with well-defined structures,which combine the advantages of POMs and MOCs,may offer the possibility to construct catalysts with highly accessible active sites.In this study,a series of POMOCs were successfully designed and synthesized using different POM templates,including[CoII1.5(L)1.5(PMo12O40)(H_(2)O)4]·3H_(2)O(Co-PMo12),[CoII1.5(L)1.5(PW12O40)(H_(2)O)4]·3H_(2)O(Co-PW12),[CoII2(L)2-(SiW12O40)(H_(2)O)4]·11H_(2)O(Co-SiW12),and H[CoII2.5(L)3-(P2W18O62)(H_(2)O)8]·10H_(2)O(Co-P2W18),which were characterized by Fourier transform infrared spectroscopy,powder X-ray diffraction,and single crystal X-ray diffraction.The differences in catalytic activity among the four POMOCs for olefin epoxidation were attributed to the distinct accessibility of Co(II)sites upon thermal activation.Among them,Co-P2W18 achieved a remarkable 99%yield of 1,2-epoxycyclooctane within 3 h at room temperature using O_(2)as the oxidant,owing to its highly accessible unsaturated Co(II)sites.Co-P2W18 exhibits significantly superior catalytic activity for the cyclooctene epoxidation reaction compared to most reported catalysts.Additionally,the reaction mechanism was investigated using density functional theory.
基金supported by the National Natural Science Foundation of China(22271075,22171071)。
文摘This study presents a novel polyoxometalate(POM)constructed crystalline inorganic framework,featuring a 2D layered architecture with irregular porosity and inherent proton sources.This unique configuration establishes an intrinsic hydrogen bonding network that facilitates proton hopping(Grotthuss mechanism),achieving a[100]directional proton conductivity of 1.75×10^(-3)S cm^(-1)under a low relative humidity(RH)of 35%at 298 K.Notably,under elevated conditions(338 K,95%RH),it attains a superprotonic conductivity of 1.61 S cm^(-1),representing one of the highest values recorded for framework materials to date.Analysis of the molecular structure,pore geometry characteristics and topological connectivity,and water vapor adsorption experiment(offering proton diffusion coefficient),indicates that the exceptional water-mediated proton dynamics stem from the interlayer S-shaped irregular pore channels,which probably induce a siphon-like effect to significantly enhance the transport of hydrated protons under the vehicle mechanism.This work not only proposes a POM strategy for constructing 2D inorganic frameworks but also reveals the irregular pore channel-enhanced proton dynamics,providing new insights into the optimization of proton conductors.
基金supported by the National Natural Science Foundation of China(21831001,21571016,91122028)the National Science Fund for Distinguished Young Scholars(20725101)。
文摘A core-shell type Co_(19)-added polyoxometalate H_(17)Na_(4)Cs_(21)[Co_(19)(μ_(3)-OH)_(12)(A-α-SiW_(10)O_(37))_(6)]·8 Cl·12H_(2)O(1)has been made under hydrothermal conditions guided by the lacunary directing synthetic strategy.Single crystal X-ray diffraction(SXRD)has shown that 19 Co^(2+)are arranged in a flat plane through edge sharing in a mode of 3-4-5-4-3,forming a core-shell type polyanion cluster{Co_(19)(SiW_(10))_6}with a diameter of approximately 2.24 nm.Visible-light-driven photocatalytic hydrogen evolution performance studies have shown that 1 is an efficient heterogeneous water reduction catalyst(WRC)with the H_(2)evolution rate of 2902.5μmol h^(-1)g^(-1).Moreover,the cycle tests indicated that 1 was also a good heterogeneous catalyst.
基金supported by National Natural Science Foundation of China(No.22371278)Funding of Fujian Provincial Chemistry Discipline Alliance+1 种基金Natural Science Foundation of Fujian Province(No.2021J06035)Youth Innovation Promotion Association CAS(No.Y2018081)。
文摘For a long time,researchers have been fascinated by the structurally diverse and high-performance characteristics of polyoxometalates(POMs).Modifying POMs with various types and properties of metals has broadened their applications in fields such as magnetism,luminescence,and catalysis.However,despite the discovery of numerous POM structures doped with transition metal ions,the development of aluminum(Al)as aⅢA group metal in the POM field has been slow.Aluminum,the most abundant metal in nature,offers innate electron-deficient properties that,when combined with highly charged POMs,could introduce novel structures and excellent functionalities like proton conduction to this field.Therefore,this review will address the gap in summarizing Al-containing POMs by categorizing and summarizing the synthesis,structural characteristics,and properties of Al-containing POMs,aiming to provide a theoretical foundation for exploring POM structures doped with Al atoms.The review also analyzes and forecasts the prospects in this field.
基金financially supported by the Program for the Development of Science and Technology of Jilin Province(Nos.YDZJ202201ZYTS313,YDZJ202201ZYTS395,20240402072GH,and 20240101004JJ)the National Natural Science Foundation of China(Nos.22201097 and 52171210)。
文摘Improving the surface atoms utilization efficiency of catalysts is extremely important for large-scale H_(2)production by electrochemical water splitting,but it remains a great challenge.Herein,we reported two kinds of Mo O_(3)-polyoxometalate hybrid nanobelt superstructures(MoO_(3)-POM HNSs,POM=PW_(12)O_(40)and Si W_(12)O_(40))using a simple hydrothermal method.Such superstructure with highly uniform nanoparticles as building blocks can expose more surface atoms and emanate increased specific surface area.The incorporated POMs generated abundant oxygen vacancies,improved the electronic mobility,and modulated the surface electronic structure of MoO_(3),allowing to optimize the H^(*)adsorption/desorption and dehydrogenation kinetics of catalyst.Notably,the as-prepared MoO_(3)-PW_(12)O_(40)HNSs electrodes not only displayed the low overpotentials of 108 mV at 10 mA/cm^(2)current density in 0.5 mol/L H_(2)SO_(4)electrolyte but also displayed excellent long-term stability.The hydrogen evolution reaction(HER)performance of MoO_(3)-POM superstructures is significantly better than that of corresponding bulk materials MoO_(3)@PW_(12)O_(40)and Mo O_(3)@Si W_(12)O_(40),and the overpotentials are about 8.3 and 4.9 times lower than that of single Mo O_(3).This work opens an avenue for designing highly surface-exposed catalysts for electrocatalytic H_(2)production and other electrochemical applications.
基金the financial support from the National Natural Science Foundation of China(No.21971085)the Natural Science Foundation of Shandong Province(No.ZR2021MB008)。
文摘In the field of Raman spectroscopy detection,the quest for a non–noble metal,recyclable,and highly sensitive detection substrate is of utmost importance.In this work,a new crystalline and noble metal–free substrate of[Bi(DMF)_(8)][PMo_(12)O_(40)](Bi–PMo_(12))is designed,which is composed of[PMo_(12)O_(40)]^(3−)and solvated[Bi(DMF)_(8)]^(3+)cations.Mechanistic studies have revealed that Raman scattering quenching phenomenon arises from two main factors.Firstly,it arises from the absorption of the scattered light due to the transition of a single electron in the reduced state of MoV between 4d orbitals.Secondly,after the interaction between the substrate and hydrazine,the surface undergoes varying degrees of roughening,leading to an impact on the scattered light intensity.These two effects collectively contribute to the detection of low concentrations of N_(2)H_(4).As a result,Bi–PMo_(12)opens up a novel Raman scattering quenching mechanism to realize the detection of reduced N_(2)H_(4)small molecules.A remarkably low detection limit of 4.5×10^(−9)ppm for N_(2)H_(4)is achieved on the Bi–PMo_(12)substrate.This detection has a lower concentration than the currently known SERS detection of N_(2)H_(4).Moreover,Bi–PMo_(12)can be recovered and reused through recrystallization,achieving a recovery rate of up to ca.51%.This study reveals the underlying potential of crystalline polyoxometalate materials in the field of Raman detection,thus opening up new avenues for highly sensitive analysis using Raman techniques.
基金supported by the National Natural Science Foundation of China(22071019,21872021 and 21671033).
文摘With several favorable properties,including flexibility,biocompatibility,and conductivity,conductive hydrogels are one of the most promising flexible sensing materials and are expected to be used in areas such as wearable devices,health monitoring,and electronic skin.However,water in hydrogels freezes at sub-zero temperatures,which greatly affects the performance of hydrogels at low temperatures.Therefore,it remains a challenge to prepare conductive hydrogels that can maintain their performance at low temperatures.In this work,we developed a series of polyoxometalate-based anti-freezing hydrogels with high conductivity by constructing a semi-interpenetrating network using polyacrylamide and sodium alginate,and then introducing H_(3)PW_(12)O_(40)(HPW)and glycerol into it via a facile soaking strategy.Among the obtained anti-freezing hydrogels,PSWG-50%hydrogel has the proton conductivity of 0.325 S·cm^(−1) at room temperature and can maintain high proton conductivity over a wide temperature range from−20 to 65℃.Based on these advantages,PSWG-50%hydrogel has been used in flexible sensors to monitor human movement,such as limb bending.Whether in mild or cold environments,PSWG-50%hydrogel shows great potential in the field of flexible sensor.
基金financial support provided by the National Natural Science Foundation of China(62374105,62304124,52472259,62204098,22179051)the Special Fund of Taishan Scholar Program of Shandong Province(tsqnz20221141)。
文摘Persistent illumination inevitably leads to the formation of Pb^(0)and I^(0)species in perovskite film,serving as non-radiative recombination centers and thus limiting the process of the commercial application.Herein,we propose a redox strategy to dynamically eliminate the defective Pb^(0)and I^(0)generated during device operation using polyoxometalate(POM)as an additive.Benefiting from the reversible W^(5+/6+)redox activity and the structural stability when accepting and donating electrons from perovskite film,POMs play a role of the redox shuttle that oxidizes Pb^(0)into Pb^(2+)and reduces I^(0)into I^(-),consequently inhibiting the formation of Pb^(0)and I^(0)species and reducing the film defects,which benefits the improvement of stability and performance.As a result,the efficiency of carbon-based all-inorganic CsPbI_(2)Br cell is significantly improved to 15.12% and the efficiency of the organic-inorganic hybrid(Cs_(0.05)MA_(0.05)FA_(0.9))Pb(I_(0.93)Br_(0.07))_(3)cell is also increased to 24.20%.More importantly,the target device shows superior stability under air conditions after storage for 1500 h,high temperature after 750 h,and persistent irradiation over200 h,respectively,providing a new method for efficient and stable perovskite solar cells.
基金financially supported by the National Natural Science Foundation of China(Nos.21871025,21831001)the Recruitment Program of Global Experts(Young Talents)Beijing Institute of Technology(BIT)Excellent Young Scholars Research Fund.
文摘Comparing to the conventional polyoxometalate(POM)-templated silver(Ag)clusters,asymmetrically covered POM-templated Ag clusters have been rarely reported.In this work,a new Ag cluster,H[Co(SiW_(11)O_(39))Co_(4)(OH)_(3)(NO_(3))_(2)(SiW_(9)O_(34))@Ag_(37)(^(t)BuC≡C)_(23)(NO_(3))_(2)(DMF)_(3)](Ag_(37)Co_(5)),has been successfully prepared using a facile solvothermal approach.Such a unique asymmetrical architecture is ascribed to the uneven charge distribution of the in situ generated[Co(SiW_(11)O_(39))]^(6-)and[Co_(4)(OH)_(3)(NO_(3))_(2)(SiW_(9)O_(34))]^(7-)moieties,leading to the asymmetrical coverage of alkynyl-protected Ag shell.Various physicochemical and catalytic studies revealed that the resulting solid-state Ag_(37)Co_(5) crystals exhibited interesting temperature-dependent photoluminescence property,efficient and recyclable photothermal conversion ability,and good catalytic activity towards the detoxication of 4-nitrophenol.
基金supported by the National Natural Science Foundation of China(Grant No.21471029).
文摘Efficient removal of antibiotics is of great significance for the sustainability of aquatic ecosystems.In this work,a new polyoxometalate-based metal-organic hybrid material[Ag_(3)L_(0.5)(HSiW_(12)O_(4)0)]·2C_(2)H_(5)OH·2CH_(3)CN(Ag-L-SiW_(12))was prepared by using Keggin-type polyoxometalate anion and thiacalix[4]arene-based ligand(L)via solvothermal method.Subsequently,a composite heterojunction Ag-L-SiW_(12)@BiVO_(4)photoanode was fabricated by loading Ag-L-SiW_(12)on the surface of BiVO_(4).The photoelectrocatalytic degradation performance of ciprofloxacin(CIP)was explored under the simulated solar radiation.Remarkably,the CIP degradation efficiency reached 93%within 240 min using the optimal Ag-LSiW_(12)@BiVO_(4)photoanode,which is approximately 2 and 23 times those of pristine BiVO_(4)and Ag-L-SiW_(12),respectively.Furthermore,density functional theory(DFT)calculations were conducted to elucidate the role of Ag-L-SiW_(12)during the photoelectrocatalytic process.This work offers an example of the efficient composite photoelectrocatalysts for the treatment of antibiotic wastewater.
基金supported by the National Natural Science Foundation of China(22201244,22374125,21971221 and 21773203)the Yangzhou University Interdisciplinary Research Foundation for Chemistry Discipline of Targeted Support(yzuxk202010)+2 种基金High-Level Entrepreneurial and Innovative Talents Program of Jiangsu‘Qing Lan Project’in Colleges and Universities of Jiangsu ProvinceLvyangjinfeng Talent Program of Yangzhou,China Postdoctoral Science Foundation(2022M722688)。
文摘The polysulfides shuttle effect,sluggish sulfur redox kinetics and the corrosion of the Li anode have become important factors limiting the commercial application of lithium-sulfur batteries(LSBs).Herein,the polyoxometalate(POM)nanoclusters with high catalytic activity and cobalt selenide with strong polarity are initially complemented to construct a PMo_(12)/CoSe_(2)@NC/CNTs multifunctional separator that can simultaneously solve the above problems.A series of experimental and theoretical results demonstrate that the Keggin-type POM,H_(3)PMo_(12)O_(40)nH_(2)O(PMo_(12))nanoclusters could function as catalytic centers for sulfur-involved transformations,with the CoSe_(2)nanoparticles serving as adsorption sites for soluble polysulfides.Accordingly,the assembled battery with the PMo_(12)/CoSe_(2)@NC/CNTs modified separator achieves an initial discharge capacity of 1263.79 mA h g^(-1),maintaining 635.77 mA h g^(-1),with a capacity decay rate of 0.06%per cycle after 500 cycles at 3C.This work provides a strategic approach for incorporating POM nanoclusters with polar periodic nanomaterials in LSB separators,contributing to the development of multifunctional separator materials,thus promoting the advancement of energy storage systems.
基金supported by the National Natural Science Foundation of China(Nos.22171287 and 52303274)Taishan Scholar Project of Shandong Province(No.tsqn202103046)+2 种基金Natural Science Foundation of Shandong Province(No.ZR2022QE175)Young Innovative Science and Technology Support Program for Universities of Shandong Province,P.R.China(Nos.2023KJ280 and 2021KJ014)Fundamental Research Funds for the Central Universities(Nos.24CX07007A and 22CX01002A-1)
文摘Constructing clus ter heterostructures with strongly coupled interfaces is of great importance to accelerating the catalytic reactions that involve multiple intermediates.Herein,a strongly coupled cluster heterostructure composed of platinum and molybdenum carbide(Pt@Mo_(2)C)derived from polyoxometalate clusters is designed to achieve excellent alkaline hydrogen evolution reaction.The Pt@Mo_(2)C cluster exhibits strong electronic interactions between Pt and Mo_(2)C,working together to facilitate the H_(2)O dissociation by concurrently binding intermediates(Pt-H*and Mo-OH*),thus accelerating the kinetics of the rate-determining Volmer step.Theoptimized Pt@Mo_(2)C exhibits a high mass activity of12.1 A·mgpt^(-1),19.2 times higher than that of 20%Pt/C in alkaline media.Moreover,it can be stabilized at a current density of 100 mA·cm^(-2)for more than 200 h.This work demonstrated the superiority of the cluster heterostructures and co-catalytic effect towards the development of highly efficient electrocatalysts.
基金supported by the National Natural Science Foundation of China(No.21801153)Natural Science Foundation of Shandong Province(No.ZR2023MB065)+1 种基金Academic promotion program of Shandong First Medical University(No.2019LJ003)High-level Overseas Talent Workstation of Shandong Province.
文摘Green synthesis of drugs is of paramount importance for current public health and a prerequisite to new drugs exploiting.Nowadays,novel strategies of disease diagnosis and therapies are in blooming development as remarkable advances have been achieved which are all highly depended on drug development.Under the current requirements to high production capacity and novel synthesis methods of drugs,green synthesis based on strategies with different ways of empowering,advanced catalysts and unique reaction equipment are attracting huge attention and of great challenging.Higher quality products and environmentally friendly synthesis conditions are becoming more and more important for manufacturing process which has new requirements for catalyst materials and synthesis processes.Polyoxometalates(POMs)are class of transition metals-oxygen clusters with precise molecular structures and superior physicochemical properties which have made longstanding and important applications upon research community of functional materials,catalysis and medicine.In this review,the recent advances of polyoxometalates based strategies for green synthesis of drugs are summarized including POMs based catalysts,alternative reaction equipment based novel synthesis protocols.The significance of POMs to pharmaceutical and industrial field is highlighted and the related perspective for future development are well discussed.
基金the National Natural Science Foundation of China(No.52372264,32271609,52073071,51703043)the Natural Science Foundation of Heilongjiang Province of China(No.LH2023B002).
文摘Nanozymes,as a new generation of artificial enzymes,exhibit similar chemical properties,catalytic efficiency,and reaction kinetics to natural enzymes.Nanozymes can offer several advantages over natural enzymes,including the decreased cost,the increased stability,and the enhanced catalytic activity.These advantages have positioned nanozymes as a research focus in the fields of chemistry,materials and biomedicine.Polyoxometalates(POMs)and their composites have been found to possess excellent catalytic capabilities as peroxidase mimics.Given this,this review aims to provide a comprehensive overview of the POM-based nanozymes,covering their structural categorization,evolution,and various applications over the past decade.The dynamic nature of this field would promise the intriguing challenges and opportunities in the future.Additionally,we address the existing issues with the POM-based peroxidase-like enzymes and suggest the potential directions for future research.This review would serve as a valuable resource for researchers seeking to develop the improved therapeutic and diagnostic technologies using the POM-based nanozymes,thereby advancing the fields of biochemistry and materials science.
基金financially supported by the Foundation of Jilin Educational Committee(JJKH20231298KJ)Natural Scientific Foundation of Jilin Province Science and Technology Department(20230101032JC)
文摘Noble metal nanoclusters have attracted great scientific interests due to their tempting properties and applications.Significant strides have been made in recent years to synthesis atomically precise nanoclusters by utilizing polyoxometalates as protecting ligands.Remarkably,the group of Professor Suzuki from the University of Tokyo has made a great contribution in this field.Here we spotlight on four related papers in this area and present a brief highlight of these publications.
基金supported by the National Key Basic Research Program of China(973 program,2013CB934101)National Natural Science Foundation of China(21433002,21573046)+1 种基金China Postdoctoral Science Foundation(2016M601492)International Science and Technology Cooperation Projects of Guangxi(15104001-5)~~
文摘Production o f aromatics from lignin has attracted much attention. Because of the coexistence of C-O and C-C bonds and their complex combinations in the lignin macromolecular network, a plausible roadmap for developing a lignin catalytic decomposition process could be developed by exploring the transformation mechanisms of various model compounds. Herein, decomposition of a lignin model compound, 2-phenoxyacetophenone （2-PAP）, was investigated over several ce-sium-exchanged polyoxometalate （Cs-POM） catalysts. Decomposition of 2-PAP can follow two dif-ferent mechanisms： an active hydrogen transfer mechanism or an oxonium cation mechanism. The mechanism for most reactions depends on the competition between the acidity and redox proper-ties of the catalysts. The catalysts of POMs perform the following functions： promoting active hy-drogen liberated from ethanol and causing formation of and then temporarily stabilizing oxonium cations from 2-PAP. The use of Cs-PMo, which with strong redox ability, enhances hydrogen libera-tion and promotes liberated hydrogen transfer to the reaction intermediates. As a consequence, complete conversion of 2-PAP （〉99%） with excellent selectivities to the desired products （98.6% for phenol and 91.1% for acetophenone） can be achieved.
基金financially supported by the National Natural Science Foundation of China(Nos.21871025 and 21831001)the Recruitment Program of Global Experts(Young Talents)BIT Excellent Young Scholars Research Fund。
文摘The design and syntheses of metal-organic cages(MOCs)based on polyoxometalates(POMs)building blocks have attracted increasing attention due to their intriguing molecular architectures and physicochemical properties.In this work,we have successfully synthesized and systematically characterized a tetrahedral polyoxometalate-based organic cage(POC),K_(3)Na_(17)H_(12)[(C_(4)H_(6)O_(6))_(6)[Ni_(4)(OH)_(3)(A-α-SiW_(9)O_(34))]_(4)]·96H_(2)O(Ni_(16)L_(6)(SiW_(9))_(4)),using tritopic Ni_(4)-substituted Keggin cluster(Ni_(4)SiW_(9))as nodes and flexible L-(+)-tartaric acid ligands as linkers.The resulting POC tetrahedron has been firstly investigated as efficient catalyst for visible-light-driven hydrogen production,achieving a turnover number of 15,500 after 96-h photocatalysis.Such high catalytic performance of Ni_(16)L_(6)(SiW_(9))_(4)POC catalyst could be attributed to its unique cage structure,thereby offering more efficient catalytic component accessibility.In addition,spectroscopic analyses illustrated the photocatalytic mechanism and the structural stability of the TBA-Ni_(16)L_(6)(SiW_(9))_(4)catalyst during the photocatalytic process.
基金supported by the Natural Science Foundation of Shandong Province of China(No.ZR2023QB278)the National Natural Science Foundation of China(No.92061120).
文摘Polyelectrolytes are charged polymers comprising macromolecules in which substantial portions of the constituent units contain cationic(e.g.,pyridinium,ammonium)or anionic(e.g.,sulfonate,carboxylate)groups,which possess special functions from the features of counterions,such as dissociation to charged species,mechanical stability,phase behavior,etc.Therefore,functional polyelectrolytes have been widely applied in many fields.In this perspective,we present some progresses in the studies of poly(polyoxometalate)s,denoted as poly(POM)s,as a kind of new charged polymers/polyelectrolytes,by covalent bonding between the inorganic polyoxometalate(POM)clusters and the organic polymer chains.According to the distinct positions of POMs in polymer chain and functions of poly(POM)s,they are divided into the following four categories:crosslinked poly(POM);side-chain poly(POM);backbone poly(POM),including poly(POM)-conjugated polymer hybrid and block poly(POM)-polymer;and POM-based covalent organic framework(PCOF).This perspective introduces the synthesis methods of poly(POM)polyelectrolytes and their macromolecular and aggregate structural characteristics,while also focusing on their properties and functions.Their application areas include catalysis,thermal resistance,optical functions,fuel cells and batteries,etc.
基金supported by the National Natural Science Foundation of China(Grant Nos.:92261203,21971106,22171073,22101118,and 22201123)the Central Guided Science and Technology Development Foundation of Liaoning Province,China(Grant No.:2022 JH6/100100036)+1 种基金the Start-up Fund from Southern University of Science and Technology(SUSTech),China,the Stable Support Plan Program of Shenzhen Natural Science Fund,China(Program Contract No.:20200925161141006)the Shenzhen Nobel Prize Scientists Laboratory Project(Shenzhen Grubbs Institute),China(Project No.:C17783101).
文摘Polyoxometalates(POMs)are molecular metal-oxide clusters with precise chemical composition and architecture.Besides their bioactivities,electron-rich POMs have shown potential for enhancing synergistic therapy,such as photothermal therapy(PTT),photodynamic therapy(PDT),and chemo-dynamic therapy(CDT),through near-infrared region(NIR)absorption and redox reactions.
基金Project supported by Institution of Chemical Materials, China Academy of Engineering Physics
文摘A series of novel photocatalysts, H3PW12O40-Y-TiO2 nanocomposites with different H3PW12O40 loading levels （10%-40%） were prepared by impregnation method. And the Y-TiO2 support, doped with yttrium, was synthesized via sol-gel technique. The prepared catalysts were characterized by Fourier transform infrared spectroscopy （FT-IR）, powder X-ray diffraction （XRD）, nitrogen adsorption-desorption analysis and scanning electron microscopy （SEM）. The processes allowed obtaining Keggin structure and crystallized anatase with large BET surface area as well as uniform distribution. The effects of H3PW12O40 loadings, catalyst dose, initial pH and concentration of dye solution on the degradation kinetics of methyl orange under UV light （λ≥365 nm） were discussed. Kinetics studies showed that the photocatalytic degradation of methyl orange fitted the apparent first-order reaction. Methyl orange was totally degraded in 21 min under optimum conditions： 20% loading, 0.03 g dose and pH 1.0. The catalyst was stable and easily to be separated from reaction system for recovery.
