Atomically precise metal nanoclusters are an emerging type of nanomaterial which has diverse interfacial metal-ligand coordination motifs that can significantly affect their physicochemical properties and functionalit...Atomically precise metal nanoclusters are an emerging type of nanomaterial which has diverse interfacial metal-ligand coordination motifs that can significantly affect their physicochemical properties and functionalities.Among that,Cu nanoclusters have been gaining continuous increasing research attentions,thanks to the low cost,diversified structures,and superior catalytic performance for various reactions.In this review,we first summarize the recent progress regarding the synthetic methods of atomically precise Cu nanoclusters and the coordination modes between Cu and several typical ligands and then discuss the catalytic applications of these Cu nanoclusters with some explicit examples to explain the atomical-level structure-performance relationship.Finally,the current challenges and future research perspectives with some critical thoughts are elaborated.We hope this review can not only provide a whole picture of the current advances regarding the synthesis and catalytic applications of atomically precise Cu nanoclusters,but also points out some future research visions in this rapidly booming field.展开更多
The polyquinolines with 2,2'-pyridylquinoline as bidentate and 2,6-diquinolylpyridine as tridentate ligand have been prepared from 4,4-dlamino- 3,3'-dibenzoyldiphenyl ether, 4,4'-diacetyldiphenyl ether and...The polyquinolines with 2,2'-pyridylquinoline as bidentate and 2,6-diquinolylpyridine as tridentate ligand have been prepared from 4,4-dlamino- 3,3'-dibenzoyldiphenyl ether, 4,4'-diacetyldiphenyl ether and 1,4-bis (2-acetylpyridyl-6-oxy) benzene, 2,6-diacetylpyridine, respectively. These polyquinoline-supported ligands have been used in hydrogenation and hydroformylation of olefins with some transition metal complexes.展开更多
The ceria-zirconia compound oxide-supported noble metal Pd(Pd@CZ)is widely used in three-way catalyst.Moreover,the surface structure of CZ plays an important role in catalytic activity of Pd.However,how to regulate th...The ceria-zirconia compound oxide-supported noble metal Pd(Pd@CZ)is widely used in three-way catalyst.Moreover,the surface structure of CZ plays an important role in catalytic activity of Pd.However,how to regulate the surface structure of CZ and clarify the structure–activity relationship is still a challenge.In this paper,a strategy is proposed to develop high activity Pd@CZ nanocatalysts by tuning Y doping sites in CZ.The precipitate-deposition method is developed to prepare the novel Ce_(0.485)Zr_(0.485)Y_(0.03)O_(2) composite with surface doping of Y(CZ-Y-S).In addition,the Pd@CZ-Y-S(Pd supported on CZ-Y-S)exhibits superior catalytic activity for HC,CO,and NO oxide,wherein,for CO and C_(3)H_(6) oxidation,the low-temperature activity of Pd@CZ-Y-S is still 20%higher than that of Pd@CZ-Y-B(Y bulk doping)and commercial Pd@CZ after 1000℃/4 h aging.The effect mechanism is further studied by density functional theory(DFT)calculation.Compared with Pd@CZ-Y-B,Pd@CZ-Y-S shows the lower CO oxide reaction energy barriers due to the weaker adsorption strength of O2.The Y surface doping strategy could provide valuable insights for the development of highly efficient Pd@CZ catalyst with extensive applications.展开更多
Two novel isopolyoxovanadates modified by ethylenediamine,[Cu(en)_(2)]_(2)[V_(4)^(Ⅳ)V_(6)^(Ⅴ)O_(25)](1)and[Cu(en)_(2)][V_(6)^(Ⅴ)O_(16)](2)(en=ethanediamine,C_(2)H_(8)N_(2)),have been successfully synthesized under ...Two novel isopolyoxovanadates modified by ethylenediamine,[Cu(en)_(2)]_(2)[V_(4)^(Ⅳ)V_(6)^(Ⅴ)O_(25)](1)and[Cu(en)_(2)][V_(6)^(Ⅴ)O_(16)](2)(en=ethanediamine,C_(2)H_(8)N_(2)),have been successfully synthesized under hydrothermal conditions.Both compounds represent new structural types in the V_(10)and V_(6)cluster family,featuring two-dimensional pure inorganic vanadate layer structures.The compounds were thoroughly characterized by infrared spectroscopy(IR),single-crystal X-ray diffraction(SCXRD),powder X-ray diffraction(PXRD),X-ray photoelectron spectroscopy(XPS),and thermogravimetric analysis(TG).Their catalytic properties were investigated in sulfide oxidation and Knoevenagel condensation under mild conditions.Notably,compound 1,which contains mixed-valent V^(Ⅳ)/V^(Ⅴ)centers,demonstrates exceptional catalytic performance in the selective oxidation of methyl phenyl sulfide.It achieves a conversion rate of 98.3% with a selectivity of 84.9% towards sulfoxide within just 30 minutes at room temperature.Moreover,in the Knoevenagel condensation,compound 1 demonstrates remarkable activity with 95.2% conversion of benzaldehyde and>99% product selectivity within 90 minutes.Recycling experiments confirm the excellent stability of both compounds.This study not only enhances the structural diversity of polyoxovanadates but also offers efficient bifunctional catalysts for organic transformations under mild conditions.展开更多
Phosphaalkenes are an emerging class of ligands with unique electronic properties that can be regarded as tuneable variants of the ubiquitous CO ligand.Our group has recently reported the synthesis of the P,N-type pho...Phosphaalkenes are an emerging class of ligands with unique electronic properties that can be regarded as tuneable variants of the ubiquitous CO ligand.Our group has recently reported the synthesis of the P,N-type phosphaalkene ligand quin-CHvPMes^(*)(1,quin=2-quinolinyl)and its coordination chemistry with Rh(Ⅰ)was investigated.展开更多
1.Introduction Over the past two decades hydrocarbyl derivatives of lanthanides have been in the focus of constant attention due to their unique reactivity.1–5 Enormous progress which has been made in chemistry of al...1.Introduction Over the past two decades hydrocarbyl derivatives of lanthanides have been in the focus of constant attention due to their unique reactivity.1–5 Enormous progress which has been made in chemistry of alkyl compounds of lanthanides in the+3 oxidation state6–10 clearly demonstrated the tremendous benefits that can be achieved through their application in a series of important and hardly feasible stoichiometric and catalytic transformations.展开更多
Iron catalysis is attractive for organic synthesis because iron is inexpensive,abundant,and non-toxic.To control the activity and stability of an iron center,a large number of iron pincer complexes have been synthesiz...Iron catalysis is attractive for organic synthesis because iron is inexpensive,abundant,and non-toxic.To control the activity and stability of an iron center,a large number of iron pincer complexes have been synthesized.Many such complexes exhibit excellent catalytic activity in a number of important organic reactions such as hydrogenation,hydrosilylation,dehydrogenation,and carbon-carbon bond forming reactions.In this review,recent examples of representative iron pincer catalysts are presented.展开更多
Overcoming the pH limitation and increasing the catalyst reusability remain pressing demands for metal-lic glass(MG)in wastewater remediation.Herein,Co_(78)Si_(8)B_(14)MG ribbons are used to degrade dye wastew-ater by...Overcoming the pH limitation and increasing the catalyst reusability remain pressing demands for metal-lic glass(MG)in wastewater remediation.Herein,Co_(78)Si_(8)B_(14)MG ribbons are used to degrade dye wastew-ater by activating hydrogen peroxide(H_(2)O_(2))as Fenton-like catalysts.The Co-based MG catalysts exhibit high degradation efficiency under both acidic and alkaline conditions,and the kinetic reaction rate at pH 10(0.176 min^(−1)) and pH 4(0.089 min^(−1)) is 5.9 and 1.2 times higher than that of the extensively studied Fe-based MG catalysts,respectively.Impressively,the Co-based MG catalysts can be reused up to 20-60 times at universal pH conditions,demonstrating fairly good reusability.The newly discovered Co-based MG catalysts do not follow the classical Fenton reactions with H_(2)O^(2) the way Fe-based MGs do.In an acid environment,hydroxyl radicals play a dominant role in the degradation,while in an alkaline environ-ment,the effect of hydroxyl radicals is weakened,and Co^(3+) ions exert a relatively major function on the degradation.The excellent performance in catalytic activity and reusability at universal pH conditions of the Co-based MGs will inspire the development of MGs in wastewater treatment.展开更多
Due to their unique physical and chemical properties,two-dimensional(2D)boron nanosheets have received tremendous research attention and demonstrated substantial value in electronic devices,biomedicine,and energy conv...Due to their unique physical and chemical properties,two-dimensional(2D)boron nanosheets have received tremendous research attention and demonstrated substantial value in electronic devices,biomedicine,and energy conversion.In the preparation of boron nanosheets,compared with the bottom-up synthesis predominantly employed for electronics,the top-down synthesis route offers more facile and scalable production.In this mini-review,we mainly discuss the recent advances in the synthesis of boron nanosheets using the top-down strategy and the relevant applications in energy catalysis.Finally,inspired by our recent works on the novel applications of 2D silicon,we put forward prospects for designing boron nanosheets,providing insights into developing viable techniques for high-performance heterogeneous catalysis.展开更多
In the present study,green synthesis of silver nanoparticles(AgNPs)were prepared by using Acalypha indica(AI)plant aqueous extract,which is used as a reducing and capping agent.The surface plasma resonance of AI-AgNPs...In the present study,green synthesis of silver nanoparticles(AgNPs)were prepared by using Acalypha indica(AI)plant aqueous extract,which is used as a reducing and capping agent.The surface plasma resonance of AI-AgNPs was obtained at 436 nm by the ultraviolet-visible(UV-Vis)spectrum,which confirmed the formation of AI-AgNPs.Fourier transform infrared(FTIR)spectrometer studies revealed that phenolic and carbonyl groups are involved in the reduction of Ag+to Ag.The transmission electron microscope(TEM)micrograph reveals that the size of green synthesized AI-AgNPs was obtained in the range of 18.7 with spherical morphology.The negative zeta potential of-16.1 mV of AI-AgNPs indicates the surface charge of the AI-AgNPs as negative the colloidal formulation is moderately stable.The current investigation additionally encompasses the demonstration of the potent antimicrobial efficacy of AI-AgNPs against Escherichia coli,Salmonella typhi,Staphylococcus aureus,and Streptococcus pyogenes.Furthermore,the study involves subjecting the green synthesized AI-AgNPs to assessments of antioxidant activity using,NO,and H2O2 methodologies,anti-cancer studies,DNA binding studies,and photocatalytic dye degradation.展开更多
Single-atom catalysts(SACs)are drawing widespread attention because of high atomic availability,strong metal-support interaction(SMSI),high activity,and selectivity.The porous materials are potential supports for anch...Single-atom catalysts(SACs)are drawing widespread attention because of high atomic availability,strong metal-support interaction(SMSI),high activity,and selectivity.The porous materials are potential supports for anchoring single atoms due to their ultrahigh surface areas and homogeneously adjustable channel structure.The SACs stabilized over the porous materials,such as zeolites,metal-organic frameworks(MOFs),carbon nitride(CN),and other mesoporous materials(silica,metal oxides),have been extensively explored nowadays.In this review,we summarize and highlight the latest studies in microenvironment regulation of single atom active centers through a full-scale comparison over porous materials anchored SACs in the advancement of structure characteristics,modulation strategy,characterizations,and reaction implementations.The precise electronic and geometric configurations of isolated metal atoms can be modulated through the strong interaction between the metals and supports of porous materials.Furthermore,recent progress of certain typical catalytic reaction is comprehensively explored to receive in-depth analysis of the catalytic mechanisms over the well-regulated SACs based on advanced techniques.Finally,the principal challenges and outlooks of porous materials supported SACs toward potential catalytic reaction are also suggested and expected.This work will offer novel perspectives on the progression of well distributed catalysts for a series of practical application.展开更多
Copper has received extensive attention in the field of catalysis due to its rich natural reserves,low cost,and superior catalytic performance.Herein,we reviewed two modification mechanisms of co-catalyst on the coord...Copper has received extensive attention in the field of catalysis due to its rich natural reserves,low cost,and superior catalytic performance.Herein,we reviewed two modification mechanisms of co-catalyst on the coordination environment change of Cu-based catalysts:(1)change the electronic orbitals and geometric structure of Cu without any catalytic functions;(2)act as an additional active site with a certain catalytic function,as well as their catalytic mechanism in major reactions,including the hydrogenation to alcohols,dehydrogenation of alcohols,water gas shift reaction,reduction of nitrogenous compounds,electrocatalysis and others.The influencing mechanisms of different types of auxiliary metals on the structure-activity relationship of Cu-based catalysts in these reactions were especially summarized and discussed.The mechanistic understanding can provide significant guidance for the design and controllable synthesis of novel Cu-based catalysts used in many industrial reactions.展开更多
Atomically dispersed catalysts(ADCs)have been diffusely researched for the development of advanced catalytic processes owing to their welldefined structure,high atomic utilization,and outstanding activity.Precisely de...Atomically dispersed catalysts(ADCs)have been diffusely researched for the development of advanced catalytic processes owing to their welldefined structure,high atomic utilization,and outstanding activity.Precisely decoding the intrinsic structures and coordination microenvironments of ADCs still confronts significant challenges.Overcoming these challenges is important for profound understanding of the structure-activity relationships and directing the future design of ADCs.Herein,this minireview summarizes recent progress and advanced characterization techniques for the engineering of ADCs,including single-atom catalysts,dualatom catalysts,and atomic cluster catalysts with regard to precise synthesis,structural regulation,and the structure-performance relationship.The catalytic merits and regulation strategies of recent breakthroughs in energy conversion,enzyme mimicry,and organic synthesis are thoroughly discussed to disclose the catalytic mechanism-guided ADCs design.Finally,a comprehensive summary of the future challenges and potential prospects is presented to stimulate more design and application possibilities for ADCs.We believe that this comprehensive minireview will open up novel pathways for the widespread utilization of ADCs in diverse catalytic processes.展开更多
Graphene doping continues to gather momentum because it enables graphene properties to be tuned,thereby affording new properties to,improve the performance of,and expand the application potential of graphene.Graphene ...Graphene doping continues to gather momentum because it enables graphene properties to be tuned,thereby affording new properties to,improve the performance of,and expand the application potential of graphene.Graphene can be chemically doped using various methods such as surface functionalization,hybrid composites(e.g.,nanoparticle decoration),and substitution doping,wherein C atoms are replaced by foreign ones in the graphene lattice.Theoretical works have predicted that graphene could be substitutionally doped by aluminum(Al)atoms,which could hold promise for exciting applications,including hydrogen storage and evolution,and supercapacitors.Other theoretical predictions suggest that Al substitutionally doped graphene(AIG)could serve as a material for gas sensors and the catalytic decomposition of undesirable materials.However,fabricating Al substitutionally doped graphene has proven challenging until now.Herein,we demonstrate how controlled-flow chemical vapor deposition(CVD)implementing a simple solid precursor can yield high-quality and large-area monolayer AIG,and this synthesis is unequivocally confirmed using various characterization methods including local electron energy-loss spectroscopy(EELS).Detailed high-resolution transmission electron microscopy(HRTEM)shows numerous bonding configurations between the Al atoms and the graphene lattice,some of which are not theoretically predicted.Furthermore,the produced AIG shows a CO_(2) capturability superior to those of other substitutionally doped graphenes.展开更多
Carbon dots(CDs)are a class of zero-dimensional carbon-based nanomaterials with a size of less than 10 nm and remarkable fluorescence properties[1].Owing to their excellent fluorescence characteristics,chemical stabil...Carbon dots(CDs)are a class of zero-dimensional carbon-based nanomaterials with a size of less than 10 nm and remarkable fluorescence properties[1].Owing to their excellent fluorescence characteristics,chemical stability,biocompatibility,and low toxicity,CDs show great potential in biomedical,catalytic,and optoelectronic applications[2],[3].Based on their formation mechanisms,micro/nano structures,and properties.展开更多
基金supported by the open funds of Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education, Chinathe funding from Guangdong Natural Science Funds (No. 2023A0505050107)。
文摘Atomically precise metal nanoclusters are an emerging type of nanomaterial which has diverse interfacial metal-ligand coordination motifs that can significantly affect their physicochemical properties and functionalities.Among that,Cu nanoclusters have been gaining continuous increasing research attentions,thanks to the low cost,diversified structures,and superior catalytic performance for various reactions.In this review,we first summarize the recent progress regarding the synthetic methods of atomically precise Cu nanoclusters and the coordination modes between Cu and several typical ligands and then discuss the catalytic applications of these Cu nanoclusters with some explicit examples to explain the atomical-level structure-performance relationship.Finally,the current challenges and future research perspectives with some critical thoughts are elaborated.We hope this review can not only provide a whole picture of the current advances regarding the synthesis and catalytic applications of atomically precise Cu nanoclusters,but also points out some future research visions in this rapidly booming field.
文摘The polyquinolines with 2,2'-pyridylquinoline as bidentate and 2,6-diquinolylpyridine as tridentate ligand have been prepared from 4,4-dlamino- 3,3'-dibenzoyldiphenyl ether, 4,4'-diacetyldiphenyl ether and 1,4-bis (2-acetylpyridyl-6-oxy) benzene, 2,6-diacetylpyridine, respectively. These polyquinoline-supported ligands have been used in hydrogenation and hydroformylation of olefins with some transition metal complexes.
基金This study was financially supported by the National Natural Science Foundation of China(No.52204376)Youth Foundation of Hebei Province(No.E2022103007)+2 种基金Young Elite Scientists Sponsorship Program by CAST 2021QNRC001High Tech Zone Science and Technology Project of Yanjiao(No.YJXM211211)Youth Fund Project of GRINM(No.G12620223129035).
文摘The ceria-zirconia compound oxide-supported noble metal Pd(Pd@CZ)is widely used in three-way catalyst.Moreover,the surface structure of CZ plays an important role in catalytic activity of Pd.However,how to regulate the surface structure of CZ and clarify the structure–activity relationship is still a challenge.In this paper,a strategy is proposed to develop high activity Pd@CZ nanocatalysts by tuning Y doping sites in CZ.The precipitate-deposition method is developed to prepare the novel Ce_(0.485)Zr_(0.485)Y_(0.03)O_(2) composite with surface doping of Y(CZ-Y-S).In addition,the Pd@CZ-Y-S(Pd supported on CZ-Y-S)exhibits superior catalytic activity for HC,CO,and NO oxide,wherein,for CO and C_(3)H_(6) oxidation,the low-temperature activity of Pd@CZ-Y-S is still 20%higher than that of Pd@CZ-Y-B(Y bulk doping)and commercial Pd@CZ after 1000℃/4 h aging.The effect mechanism is further studied by density functional theory(DFT)calculation.Compared with Pd@CZ-Y-B,Pd@CZ-Y-S shows the lower CO oxide reaction energy barriers due to the weaker adsorption strength of O2.The Y surface doping strategy could provide valuable insights for the development of highly efficient Pd@CZ catalyst with extensive applications.
基金supported by the Natural Science Foundation of Hebei Province(Grant No.B2021205027,B2021205024 and B2020205006)the Science Foundation of Hebei Normal University(L2025K02).
文摘Two novel isopolyoxovanadates modified by ethylenediamine,[Cu(en)_(2)]_(2)[V_(4)^(Ⅳ)V_(6)^(Ⅴ)O_(25)](1)and[Cu(en)_(2)][V_(6)^(Ⅴ)O_(16)](2)(en=ethanediamine,C_(2)H_(8)N_(2)),have been successfully synthesized under hydrothermal conditions.Both compounds represent new structural types in the V_(10)and V_(6)cluster family,featuring two-dimensional pure inorganic vanadate layer structures.The compounds were thoroughly characterized by infrared spectroscopy(IR),single-crystal X-ray diffraction(SCXRD),powder X-ray diffraction(PXRD),X-ray photoelectron spectroscopy(XPS),and thermogravimetric analysis(TG).Their catalytic properties were investigated in sulfide oxidation and Knoevenagel condensation under mild conditions.Notably,compound 1,which contains mixed-valent V^(Ⅳ)/V^(Ⅴ)centers,demonstrates exceptional catalytic performance in the selective oxidation of methyl phenyl sulfide.It achieves a conversion rate of 98.3% with a selectivity of 84.9% towards sulfoxide within just 30 minutes at room temperature.Moreover,in the Knoevenagel condensation,compound 1 demonstrates remarkable activity with 95.2% conversion of benzaldehyde and>99% product selectivity within 90 minutes.Recycling experiments confirm the excellent stability of both compounds.This study not only enhances the structural diversity of polyoxovanadates but also offers efficient bifunctional catalysts for organic transformations under mild conditions.
基金support by LIKAT(PhD fellowship for P.G.)is gratefully acknowledged.
文摘Phosphaalkenes are an emerging class of ligands with unique electronic properties that can be regarded as tuneable variants of the ubiquitous CO ligand.Our group has recently reported the synthesis of the P,N-type phosphaalkene ligand quin-CHvPMes^(*)(1,quin=2-quinolinyl)and its coordination chemistry with Rh(Ⅰ)was investigated.
基金supported by the Russian Science Foundation(grant 17-73-20262-Π).
文摘1.Introduction Over the past two decades hydrocarbyl derivatives of lanthanides have been in the focus of constant attention due to their unique reactivity.1–5 Enormous progress which has been made in chemistry of alkyl compounds of lanthanides in the+3 oxidation state6–10 clearly demonstrated the tremendous benefits that can be achieved through their application in a series of important and hardly feasible stoichiometric and catalytic transformations.
文摘Iron catalysis is attractive for organic synthesis because iron is inexpensive,abundant,and non-toxic.To control the activity and stability of an iron center,a large number of iron pincer complexes have been synthesized.Many such complexes exhibit excellent catalytic activity in a number of important organic reactions such as hydrogenation,hydrosilylation,dehydrogenation,and carbon-carbon bond forming reactions.In this review,recent examples of representative iron pincer catalysts are presented.
基金supported by the National Natural Science Foundation of China(No.51801209)the Natural Science Foundation of Liaoning Province of China(Nos.2019-ZD-0195 and LQN202014)+2 种基金the Natural Science Foundation of Liaoning University(No.LDQN2019020)the Liaoning Revitalization Talents Program(Nos.XLYC1802078 and XLYC1807062)the fund of Qing-dao(No.19-9-2-1-wz).
文摘Overcoming the pH limitation and increasing the catalyst reusability remain pressing demands for metal-lic glass(MG)in wastewater remediation.Herein,Co_(78)Si_(8)B_(14)MG ribbons are used to degrade dye wastew-ater by activating hydrogen peroxide(H_(2)O_(2))as Fenton-like catalysts.The Co-based MG catalysts exhibit high degradation efficiency under both acidic and alkaline conditions,and the kinetic reaction rate at pH 10(0.176 min^(−1)) and pH 4(0.089 min^(−1)) is 5.9 and 1.2 times higher than that of the extensively studied Fe-based MG catalysts,respectively.Impressively,the Co-based MG catalysts can be reused up to 20-60 times at universal pH conditions,demonstrating fairly good reusability.The newly discovered Co-based MG catalysts do not follow the classical Fenton reactions with H_(2)O^(2) the way Fe-based MGs do.In an acid environment,hydroxyl radicals play a dominant role in the degradation,while in an alkaline environ-ment,the effect of hydroxyl radicals is weakened,and Co^(3+) ions exert a relatively major function on the degradation.The excellent performance in catalytic activity and reusability at universal pH conditions of the Co-based MGs will inspire the development of MGs in wastewater treatment.
基金supported by the National Natural Science Foundation of China(No.52372233)the Fundamental Research Funds for the Central Universities(No.226-2022-00200),China.
文摘Due to their unique physical and chemical properties,two-dimensional(2D)boron nanosheets have received tremendous research attention and demonstrated substantial value in electronic devices,biomedicine,and energy conversion.In the preparation of boron nanosheets,compared with the bottom-up synthesis predominantly employed for electronics,the top-down synthesis route offers more facile and scalable production.In this mini-review,we mainly discuss the recent advances in the synthesis of boron nanosheets using the top-down strategy and the relevant applications in energy catalysis.Finally,inspired by our recent works on the novel applications of 2D silicon,we put forward prospects for designing boron nanosheets,providing insights into developing viable techniques for high-performance heterogeneous catalysis.
文摘In the present study,green synthesis of silver nanoparticles(AgNPs)were prepared by using Acalypha indica(AI)plant aqueous extract,which is used as a reducing and capping agent.The surface plasma resonance of AI-AgNPs was obtained at 436 nm by the ultraviolet-visible(UV-Vis)spectrum,which confirmed the formation of AI-AgNPs.Fourier transform infrared(FTIR)spectrometer studies revealed that phenolic and carbonyl groups are involved in the reduction of Ag+to Ag.The transmission electron microscope(TEM)micrograph reveals that the size of green synthesized AI-AgNPs was obtained in the range of 18.7 with spherical morphology.The negative zeta potential of-16.1 mV of AI-AgNPs indicates the surface charge of the AI-AgNPs as negative the colloidal formulation is moderately stable.The current investigation additionally encompasses the demonstration of the potent antimicrobial efficacy of AI-AgNPs against Escherichia coli,Salmonella typhi,Staphylococcus aureus,and Streptococcus pyogenes.Furthermore,the study involves subjecting the green synthesized AI-AgNPs to assessments of antioxidant activity using,NO,and H2O2 methodologies,anti-cancer studies,DNA binding studies,and photocatalytic dye degradation.
基金supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region(No.2024D01C23)the China Postdoctoral Science Foundation(No.2022M721803)+2 种基金Beijing-Tianjin-Hebei Fundamental Research Cooperation Project(No.B2024202090 to L.G.W.)the National Natural Science Foundation of China(No.22325101 to D.S.W.)the China National Petroleum Corporation Basic Forward-looking Science and Technology Project(No.2023ZZ1202).
文摘Single-atom catalysts(SACs)are drawing widespread attention because of high atomic availability,strong metal-support interaction(SMSI),high activity,and selectivity.The porous materials are potential supports for anchoring single atoms due to their ultrahigh surface areas and homogeneously adjustable channel structure.The SACs stabilized over the porous materials,such as zeolites,metal-organic frameworks(MOFs),carbon nitride(CN),and other mesoporous materials(silica,metal oxides),have been extensively explored nowadays.In this review,we summarize and highlight the latest studies in microenvironment regulation of single atom active centers through a full-scale comparison over porous materials anchored SACs in the advancement of structure characteristics,modulation strategy,characterizations,and reaction implementations.The precise electronic and geometric configurations of isolated metal atoms can be modulated through the strong interaction between the metals and supports of porous materials.Furthermore,recent progress of certain typical catalytic reaction is comprehensively explored to receive in-depth analysis of the catalytic mechanisms over the well-regulated SACs based on advanced techniques.Finally,the principal challenges and outlooks of porous materials supported SACs toward potential catalytic reaction are also suggested and expected.This work will offer novel perspectives on the progression of well distributed catalysts for a series of practical application.
基金This work was supported by the National Natural Science Foundation of China(Grant No.21576205)。
文摘Copper has received extensive attention in the field of catalysis due to its rich natural reserves,low cost,and superior catalytic performance.Herein,we reviewed two modification mechanisms of co-catalyst on the coordination environment change of Cu-based catalysts:(1)change the electronic orbitals and geometric structure of Cu without any catalytic functions;(2)act as an additional active site with a certain catalytic function,as well as their catalytic mechanism in major reactions,including the hydrogenation to alcohols,dehydrogenation of alcohols,water gas shift reaction,reduction of nitrogenous compounds,electrocatalysis and others.The influencing mechanisms of different types of auxiliary metals on the structure-activity relationship of Cu-based catalysts in these reactions were especially summarized and discussed.The mechanistic understanding can provide significant guidance for the design and controllable synthesis of novel Cu-based catalysts used in many industrial reactions.
基金supported by the National Natural Science Foundation of China(grant no.22171157).
文摘Atomically dispersed catalysts(ADCs)have been diffusely researched for the development of advanced catalytic processes owing to their welldefined structure,high atomic utilization,and outstanding activity.Precisely decoding the intrinsic structures and coordination microenvironments of ADCs still confronts significant challenges.Overcoming these challenges is important for profound understanding of the structure-activity relationships and directing the future design of ADCs.Herein,this minireview summarizes recent progress and advanced characterization techniques for the engineering of ADCs,including single-atom catalysts,dualatom catalysts,and atomic cluster catalysts with regard to precise synthesis,structural regulation,and the structure-performance relationship.The catalytic merits and regulation strategies of recent breakthroughs in energy conversion,enzyme mimicry,and organic synthesis are thoroughly discussed to disclose the catalytic mechanism-guided ADCs design.Finally,a comprehensive summary of the future challenges and potential prospects is presented to stimulate more design and application possibilities for ADCs.We believe that this comprehensive minireview will open up novel pathways for the widespread utilization of ADCs in diverse catalytic processes.
基金supported by the National Natural Science Foundation of China(NSFC,No.52071225)the National Science Center,and the Czech Republic under the ERDF program“Institute of Environmental Technology-Excellent Research”(No.CZ.02.1.01/0.0/0.0/16-019/0000853)M.H.R.and L.F.thank the Sino-German Research Institute for support(No.GZ 1400).
文摘Graphene doping continues to gather momentum because it enables graphene properties to be tuned,thereby affording new properties to,improve the performance of,and expand the application potential of graphene.Graphene can be chemically doped using various methods such as surface functionalization,hybrid composites(e.g.,nanoparticle decoration),and substitution doping,wherein C atoms are replaced by foreign ones in the graphene lattice.Theoretical works have predicted that graphene could be substitutionally doped by aluminum(Al)atoms,which could hold promise for exciting applications,including hydrogen storage and evolution,and supercapacitors.Other theoretical predictions suggest that Al substitutionally doped graphene(AIG)could serve as a material for gas sensors and the catalytic decomposition of undesirable materials.However,fabricating Al substitutionally doped graphene has proven challenging until now.Herein,we demonstrate how controlled-flow chemical vapor deposition(CVD)implementing a simple solid precursor can yield high-quality and large-area monolayer AIG,and this synthesis is unequivocally confirmed using various characterization methods including local electron energy-loss spectroscopy(EELS).Detailed high-resolution transmission electron microscopy(HRTEM)shows numerous bonding configurations between the Al atoms and the graphene lattice,some of which are not theoretically predicted.Furthermore,the produced AIG shows a CO_(2) capturability superior to those of other substitutionally doped graphenes.
基金supported in part by the National Natural Science Foundation of China(U24A2079 and 82570162)the Natural Science Foundation of Henan Province(252300421125).
文摘Carbon dots(CDs)are a class of zero-dimensional carbon-based nanomaterials with a size of less than 10 nm and remarkable fluorescence properties[1].Owing to their excellent fluorescence characteristics,chemical stability,biocompatibility,and low toxicity,CDs show great potential in biomedical,catalytic,and optoelectronic applications[2],[3].Based on their formation mechanisms,micro/nano structures,and properties.
