Coupling adsorption and in-situ Fenton-like oxidation process was developed for Methylene blue(MB) using refined iron-containing lowgrade attapulgite(ATP) clay, and the removal mechanism was investigated. The MB was i...Coupling adsorption and in-situ Fenton-like oxidation process was developed for Methylene blue(MB) using refined iron-containing lowgrade attapulgite(ATP) clay, and the removal mechanism was investigated. The MB was initially adsorbed on the porous ATPs, and then the enriched MB was removed by the H2O2-assisted Fenton-like oxidation with the iron-containing ATP catalyst. Under optimal conditions, the ATP powder exhibits the maximum removal efficiency of 100% with negligible iron leaching(1.5 mg L^(-1)) and no sludge formation. Furthermore,polysulfone/ATP(PSF/ATP) pellets were fabricated through a water-induced phase separation process to construct a fixed-bed reactor(FBR) for continuous contaminant removal. For the first cycle, the maximum adsorption capacity was 15.5 L with an outlet MB concentration of1.973 mg L-1(< 2 mg L^(-1), GB4287-2012) using the PSF/ATP pellets containing 50.0 g of ATP powders, and the maximum Fenton-like oxidation capacity was 35.5 L with the outlet concentration of 0.831 mg L^(-1). After five cycles, the total treated volume of the MB solution was ca. 255 L, and the efficiency remained above 99%. After 10 h of continuous treatment towards practical resin industrial wastewater, the chemical oxygen demand(COD) removal efficiency was still measured at 83.05%, costing 0.398 $ m^(-3). These results demonstrate the practical applicability of iron-containing low-grade ATP clay for textile water treatment.展开更多
Flower-like hierarchical three-dimensional Ni Fe layered double hydroxides hollow microspheres(3D NiFe-LDH HMS),as one kind of novel non-noble metal electrocatalysts,have been fabricated in a templatefree route for wa...Flower-like hierarchical three-dimensional Ni Fe layered double hydroxides hollow microspheres(3D NiFe-LDH HMS),as one kind of novel non-noble metal electrocatalysts,have been fabricated in a templatefree route for water oxidation.Both of the concentration of ammonium fluoride and the reaction time are adjusted to obtain a series of Ni Fe-LDH microspheres,with different internal structures from massive to hollow generated during the hydrothermal treatment,which improve the electrocatalytic activity of the Ni Fe-LDH catalysts towards the evolution reaction of oxygen.The optimized Ni Fe-LDH-0.4M HMS show the excellent OER performance in alkaline electrolyte withη=290 mV@10 mA cm^-2,and a Tafel slope of 51 mV dec-1,which outperforms the benchmark RuO2 catalyst.The possible reason is attributed to the more exposure of active sites,and fast ion transport resulting from the hierarchical hollow structure.展开更多
CeO_(2)decorated CoOx rod-like hybrid,supported onto holey reduced graphene(CoOx/CeO_(2)/RGO)composite,was fabricated via a surfactant-assisted route.Its corresponding electrocatalytic performance towards oxygen reduc...CeO_(2)decorated CoOx rod-like hybrid,supported onto holey reduced graphene(CoOx/CeO_(2)/RGO)composite,was fabricated via a surfactant-assisted route.Its corresponding electrocatalytic performance towards oxygen reduction/evolution reactions(ORR and OER)was systematically investigated in alkaline electrolyte.Structural,morphological and compositional studies revealed changes in electronic and surface properties when CeO_(2)was introduced as an oxygen buffer material.The oxygen vacancies effectively enhanced the electrocatalytic activity,while the synergistic effect of co-catalyst CeO_(2),CoOx activecenters,and defective graphene with many voids facilitate the charge/mass transfer,making CoOx/CeO_(2)/RGO an efficient and stable bifunctional electrocatalyst for OER/ORR with△E=0.76 V(△E=E10mAcm.-2OER-E_(1/2).ORR).This parameter is 70 mV and 270 mV lower than CoOx/RGO and the benchmark Pt/C,respectively.In addition,the OER/ORR bifunctionality of CoOx/CeO_(2)/RGO composite outperforms that of Pt/C catalyst in a H2-O_(2)micro fuel cell platform.展开更多
Bimetallic cobalt-nickel sulfide nanoparticles anchored on S-,N-codoped holey carbon nanosheets(CoNiS-T@NCFs)with a hydrangea-like morphology,were synthesized via a confinement synthesis route,in which an intercalated...Bimetallic cobalt-nickel sulfide nanoparticles anchored on S-,N-codoped holey carbon nanosheets(CoNiS-T@NCFs)with a hydrangea-like morphology,were synthesized via a confinement synthesis route,in which an intercalated LDH precursor was subjected to the interlayer-confined carbonization and host-layer sulfurization.The phase transformation and structure evolution(e.g.,atom site occupancy,crystallite size,and cell volume)of the CoNi-S-T@NCFs electrocatalysts,as a function of sulfurization temperatures,were confirmed by X-ray diffraction and Rietveld analyses.The sulfur vacancies effectively enhance the electrocatalytic activity,while the synergistic effect of(Co,Ni)7 S8 alloy and S,N-codoped carbon matrix facilitates the electron transfer and accelerates reaction kinetics,making CoNi-S-900@NCFs an efficient and stable bifunctional electrocatalyst for oxygen reduction reaction(ORR).The rich highvalence Co(Ⅲ)and Ni(Ⅲ)of CoNi-S-900@NCFs facilitates the in-situ transformation of the metal(oxy)hydroxides intermediates with high catalytic activity for oxygen evolution reaction(OER).Thus,with a bifunctional parameter,ΔE,of 0.75 V(E_(j=10,OER)-E_(1/2,ORR)),this electrocatalyst slightly outperforms the state-of-the-art commercial Pt/C+RuO_(2)/C catalyst(ΔE=0.76 V)in alkaline medium.This work demonstrates the influence that the sulfurization temperature has on the relationship between the structure and electrocatalytic performance of bimetallic sulfides prepared by the synthesis strategy using the intercalated LDH precursor.This strategy can be extended to prepare other chalcogenides with binary or ternary transition metals.展开更多
The present paper reports a new fluoride-free and energy-saving lead electrolytic refining process in order to solve the serious problems of the existing Betts lead electrorefining process, such as low production effi...The present paper reports a new fluoride-free and energy-saving lead electrolytic refining process in order to solve the serious problems of the existing Betts lead electrorefining process, such as low production efficiency,high energy consumption and fluorine pollution. In the process, a mixed solution of perchloric acid and lead perchlorate(HClO4-Pb(ClO4)2) with the additives of gelatin and sodium lignin sulfonate is employed as the new electrolyte. The cathodic polarization curves show that HClO4 is very stable, and there is no any reduction reaction of HClO4 during the electrolytic process. The redox reactions of lead ions in HClO4 solution are very reversible with an ultrahigh capacity efficiency, so the HClO4 acts as a stable support electrolyte with higher ionic conductivity than the traditional H2SiF6 electrolyte. The results of the scale-up experiments show that under the optimal conditions of 2.8 mol·L-1 HClO4, 0.4 mol·L-1 Pb(ClO4)2 and electrolysis temperature of 45 ℃, the energy consumption is as low as 24.5 kW·h·(t Pb)-1 , only about 20% of that by Betts method at the same current density of 20 mA·cm-2, and the purity of the refined lead is up to 99.9992%, much higher than that specified by Chinese national standard(99.994%, GB/T 469-2013) and European standard(99.99%, EN 12659–1999).展开更多
Background:The adjustment of sex ratios in birds can occur at the egg and nestling stages. Previous studies showed that the sex ratio was affected by environmental factors and parental condition; it may result in seas...Background:The adjustment of sex ratios in birds can occur at the egg and nestling stages. Previous studies showed that the sex ratio was affected by environmental factors and parental condition; it may result in seasonal and ecosystem differences.Methods:In this study, the brood sex ratio of the Yellow-bellied Prinia(Prinia flaviventris) in the Nonggang area, Guangxi, southwestern China, was investigated during the breeding season from May to June in 2013 using PCR amplification from whole-genome DNA extracted from blood samples. A total of 31 nests of Yellow-bellied Prinia, including 132 brood fledglings and 31 pairs, were sampled.Results:The results showed that the brood sex ratio of the Yellow-bellied Prinia was 1:1, and sex ratios of different nests were evenly distributed within the study area. No significant relationship was found between parental quality and nest characteristics with the brood sex ratio.Conclusions:The present study indicated that no brood sex ratio bias in the Yellow-bellied Prinia highlighted the complexity of sex ratio adjustment in birds. In spite of our negative results, the lack of an association between brood sex ratio and parental quality and environmental factors in the Yellow-bellied Prinia provides valuable information on the adjustment of sex ratios in birds.展开更多
Carbon-based N-coordinated Mn(Mn-N_(x)/C)single-atom electrocatalysts are considered as one of the most desirable non-precious oxygen reduction reaction(ORR)candidates due to their insignificant Fenton reactivity,high...Carbon-based N-coordinated Mn(Mn-N_(x)/C)single-atom electrocatalysts are considered as one of the most desirable non-precious oxygen reduction reaction(ORR)candidates due to their insignificant Fenton reactivity,high abundance,and intriguing electrocatalytic performance.However,current MnN_(x)/C single-atom electrocatalysts suffer from high overpotentials because of their low intrinsic activity and unsatisfactory chemical stability.Herein,through an in-situ polymerization-assisted pyrolysis,the Co as a second metal is introduced into the Mn-N_(x)/C system to construct Co,Mn-N_(x)dual-metallic sites,which atomically disperse in N-doped 1D carbon nanorods,denoted as Co,Mn-N/CNR and hereafter.Using electron microscopy and X-ray absorption spectroscopy(XAS)techniques,we verify the uniform dispersion of CoN4and MnN4atomic sites and confirm the effect of Co doping on the MnN_(4) electronic structure.Density functional theory(DFT)calculations further elucidate that the energy barrier of ratedetermining step(^(*)OH desorption)decreases over the 2 N-bridged MnCoN_(6) moieties related to the pure MnN_(4).This work provides an effective strategy to modulate the local coordination environment and electronic structure of MnN_(4) active sites for improving their ORR activity and stability.展开更多
Soybean(Glycine max[L.]Merr.)is a food and oil crop whose growth and yield are influenced by root and nodule development.In the present study,Gm NMHC5 was found to promote the formation of nodules in overexpressing mu...Soybean(Glycine max[L.]Merr.)is a food and oil crop whose growth and yield are influenced by root and nodule development.In the present study,Gm NMHC5 was found to promote the formation of nodules in overexpressing mutants.In contrast,the number of nodules in Gmnmhc5 edited with CRISPR/Cas9 decreased sharply.In 35 S:Gm NMHC5 mutants,expression levels of genes involved in nodulation were significantly up-regulated.Both in vitro and in vivo biochemical analyses showed that Gm NMHC5 directly interacted with Gm GAI(a DELLA protein),and the content of gibberellin 3(GA_(3))in overexpressing mutants was lower than that in the wild type.These results revealed that Gm NMHC5 participates in the classical GA signaling pathway,and may regulate the content of GA_3 to match the optimal concentration required for nodule formation,thereby promoting nodulation by directly interacting with Gm GAI.A model illustrating the mechanism by which Gm NMHC5 promotes soybean nodulation is presented.展开更多
According to the problems such as low level and depth of experimental teaching research of Mongolian medicine in higher vocational colleges, lack of applicable teaching model mold, lack of students practical operation...According to the problems such as low level and depth of experimental teaching research of Mongolian medicine in higher vocational colleges, lack of applicable teaching model mold, lack of students practical operation in time, and single teaching, the development direction and ideas of bloodletting model mold in Mongolian medicine in vocational Mongolian medicine teaching were proposed to provide valuable reference for the experimental teaching reform of traditional therapy of Mongolian medicine and the teaching reform and development ideas of Mongolian medicine and other traditional medicine.展开更多
Echinacoside(ECH),a representative phenylethanol glycoside,exhibits diverse pharmacological properties and is used in the treatment of neurodegenerative disorders(e.g.,Parkinson’s and Alzheimer’s diseases),ischemic ...Echinacoside(ECH),a representative phenylethanol glycoside,exhibits diverse pharmacological properties and is used in the treatment of neurodegenerative disorders(e.g.,Parkinson’s and Alzheimer’s diseases),ischemic brain injury,and cancer.The growing therapeutic demand for ECH has highlighted the need for scalable production.However,conventional methods face major limitations:chemical synthesis is hindered by the compound’s structural complexity,and the yield of ECH extracted from plants is naturally low due to the host-dependent growth of Cistanche deserticola(C.deserticola),a parasitic desert plant.To establish a sustainable microbial production platform,we first deciphered the biosynthetic pathway of ECH in C.deserticola by integrating metabolomics analyses of plant tissues and callus cultures.This enabled the identification of key precursors,enzymatic steps,and regulatory mechanisms.Leveraging this knowledge,we engineered the pathway in Saccharomyces cerevisiae,achieving de novo ECH biosynthesis at a titer of 7.52±1.42 mg/l.This study lays the foundation for industrial-scale ECH production and deepens our understanding of bioactive compound biosynthesis in parasitic plants,offering insights for future pathway engineering efforts.展开更多
Herein,FeCo bimetallic organic frameworks(MOFs)with different compositions were fabricated by controlling the initial molar ratio of Fe^(3+)/Co^(2+)ions.Through a one-step carbonization treatment of FeCo MOFs and the ...Herein,FeCo bimetallic organic frameworks(MOFs)with different compositions were fabricated by controlling the initial molar ratio of Fe^(3+)/Co^(2+)ions.Through a one-step carbonization treatment of FeCo MOFs and the melamine mixture,a series of FeCo nanoalloys encapsulated in bamboo-like N-doped carbon nanotubes(CNTs).展开更多
It is of great and increasing interest to develop multifunctional additives to enhance the anti-aging performance of polypropylene(PP)and then enlarge its application fields.Here,a hindered amine light stabilizer(H fo...It is of great and increasing interest to develop multifunctional additives to enhance the anti-aging performance of polypropylene(PP)and then enlarge its application fields.Here,a hindered amine light stabilizer(H for HALS)and a hindered phenolic antioxidant(D for DBHP)with low molecular weight were co-intercalated into layered double hydroxides(LDHs)through a coprecipitation method to produce a series of inorganic–organic hybrid materials Zn2Al-HxDy-LDH,adjusting the anion ratio(x+y=1 and x:y=0:1,1:0,1:1,2:1,1:2).Subsequently,hybrid material LDH fillers(HALS-LDH,DBHP-LDH,HxDy-LDH,and(H-LDH)x(D-LDH)y),used as anti-aging agents,were successively dispersed into PP by two methods:solvent mixing/casting and extrusion mixing.The corresponding crystalline structure,morphological,rheological properties and thermal and light oxidative degradation behaviour were carefully investigated using various techniques such as XRD,TEM and rheology.The results showed that the LDH fillers were well dispersed into PP without any influence on its crystallization behavior and provided a chain extension effect on PP,and this is even more pronounced for HxDy-LDH.The thermal stability of HxDy-LDH/PP composites(x:y=1:1,2:1,1:2)is significantly improved,compared with that of other composites.Moreover,through the accelerated aging test,the co-intercalated hybrid material HxDy-LDH significantly inhibited the oxidative degradation of PP(thermal-aging and light-aging).The concomitant presence of HALS/DBHP co-intercalated within the LDH structure strongly improved the anti-aging performance of PP.Therefore,such a co-intercalated I/O hybrid adaptive system as a multifunctional additive agent opens the pathway for potential future research of high-performance PP associated with hybrid fillers.展开更多
Developing efficient Pt-free electrocatalysts for hydrogen evolution reaction(HER)at all pHs remains challenging for large-scale hydrogen production,especially in alkaline and neutral conditions,because of sluggish wa...Developing efficient Pt-free electrocatalysts for hydrogen evolution reaction(HER)at all pHs remains challenging for large-scale hydrogen production,especially in alkaline and neutral conditions,because of sluggish water dissociation.Herein,the synthesis of novel highly dispersed RuO_(-2) nanoparticles on NiO nanosheet arrays(RuO_(-2)/NiO/NF)with efficient pH-universal HER electrocatalysis via a simple in situ growth and sequential calcination process is reported.The as-prepared RuO_(-2)/NiO/NF nanosheet arrays exhibit outstanding HER performance with overpotentials of 31,66,and 84 mV to deliver 10,100,and 300 mA cm^(-2),respectively,in 1.0 M KOH,outperforming even the commercial Pt/C electrocatalyst.In addition,RuO_(-2)/NiO/NF shows a higher turnover frequency at an overpotential of 100 mV in comparison with Pt/C electrocatalyst.It also requires extremely low overpotentials of 98 mV and 254 mV to afford 300 mA cm^(-2) in 0.5 M H_(2)SO_(4) and 1.0 M PBS-neutral solution,respectively.Moreover,RuO_(-2)/NiO/NF can work at 100 mA cm^(-2) for 200 h with negligible decay in 1.0 M KOH.The splendid HER performance can be ascribed to the 3D nanosheet arrays and highly dispersed RuO_(-2) nanoparticles with richly exposed active sites,favoring the efficient electron and mass transfer to the active sites.展开更多
Five boehmite adsorbents with high percentage of exposed(020)facets and large specific surface area were prepared by the separate nucleation and aging steps(SNAS)method at different rotating speeds,namely B-n(n=rotati...Five boehmite adsorbents with high percentage of exposed(020)facets and large specific surface area were prepared by the separate nucleation and aging steps(SNAS)method at different rotating speeds,namely B-n(n=rotating speeds)from 500 to 1500 rpm of the rotating liquidfilm reactor(RLFR).From 500 rpm to 1500 rpm,both specific surface area and percentage of exposed(020)facets increased by ca.10.8%and 16.9%,respectively.For all the samples,the adsorption behavior followed the pseudo-second order model and Langmuir isotherm model towards Congo red(CR).The B-1500 sample exhibited the best adsorption performance for CR with the maximum adsorption quantity of 1298.3 mg g^(−1) in neutral pH solution because of the smallest average particle size(d=55.6 nm),highest specific surface area(BET=224.42 m^(2)g^(−1)),and highest percentage of exposed(020)facets(55.18%).In particular,the boehmite pellets shaped with the alginate-assisted moulding method showed promising practical applications for the removal of CR in water through afixed-bed adsorption column;for example,ca.600 mL of boehmite pellets including ca.15.0 g of boehmite powder has the removal effciency of 75%in 3500 mL of aqueous solution with 100 mg L^(−1)CR.展开更多
Correction for‘Design,fabrication and anti-aging behavior of a multifunctional inorganic-organic hybrid stabilizer derived from co-intercalated layered double hydroxides for polypropylene’by Qian Zhang et al.,Inorg....Correction for‘Design,fabrication and anti-aging behavior of a multifunctional inorganic-organic hybrid stabilizer derived from co-intercalated layered double hydroxides for polypropylene’by Qian Zhang et al.,Inorg.Chem.Front.,2019,6,2539-2549.展开更多
A series of hierarchical flower-like magnesium oxide(MgO)microspheres were prepared with an ethylene glycol(EG)-assisted route at room temperature using ammonia as a precipitating agent.Effects of the ethylene glycol(...A series of hierarchical flower-like magnesium oxide(MgO)microspheres were prepared with an ethylene glycol(EG)-assisted route at room temperature using ammonia as a precipitating agent.Effects of the ethylene glycol(EG)ratio on the structure,morphology and pore properties were carefully investigated.展开更多
The pore structure of spherical alumina supports is closely related to the dispersion of catalytically active components and the diffusion of reactants.Maintaining excellent pore structure under strict reaction condit...The pore structure of spherical alumina supports is closely related to the dispersion of catalytically active components and the diffusion of reactants.Maintaining excellent pore structure under strict reaction conditions is of utmost importance.In this work,sphericalγ-Al_(2)O_(3)support with a bimodal pore structure,composed of macropores and mesopores,was successfully synthesized using dodecane as the pore-forming agent through the oil–ammonia column-shaping method.The morphology and internal pore structure of the alumina were found to be influenced by the amount of surfactant added and ultrasound treatment conditions.Notably,when concentration of surfactant was 4‰and ultrasound voltage of 20 V was applied,the resultingγ-Al_(2)O_(3)-4‰-20 displayed a highly concentrated distribution of macropores with an average pore size of 100 nm,resulting in an impressive porosity of 69.21%.In contrast,the untreated sample ofγ-Al_(2)O_(3)-0-0 only exhibited a mesoporous distribution with a porosity of 54.03%.Moreover,after being subjected to a hydrothermal treatment in a high temperature(600°C)and high humidity(water vapor)environment for 120 h,theγ-Al_(2)O_(3)-4‰-20 sample maintained a high BET specific surface area of 170.9 m^(2)g^(−1)and mercury intrusion porosimetry specific surface area of 263.3 m^(2)g^(−1).展开更多
Hierarchical porous magnesium silicate hydrate (MSH) microspheres composed of sheets are successfully developed under facile conditions using a hard template. The role of hexadecyltrimethylammonium bromide (CTAB) on t...Hierarchical porous magnesium silicate hydrate (MSH) microspheres composed of sheets are successfully developed under facile conditions using a hard template. The role of hexadecyltrimethylammonium bromide (CTAB) on the formation and adsorption behavior was also observed for the methyl orange and methylene blue. The formed MSH possesses a surface area of 453.24 m^(2)/g, an average pore size of 6.38 nm, and a pore volume of 0.75 cm^(3)/g without CTAB. Based on the role of CTAB and the change in the ratio of Mg/Si, the MSH retained its sphere-like structure with a variation in pore parameters. The formed MSH was used as an adsorbent to remove methylene blue and methyl orange. The pseudo-second-order kinetic and Langmuir Isotherm models are well-fitted, with a 256.4 mg/g removal capacity and 84.2 mg/g for methylene blue and methyl orange, respectively. The modified MSH with CTAB played a positive role for the methyl orange and a negative role for the methylene blue regarding removal performance.展开更多
基金supported by Gansu Cuihua Technology Co.,Ltd.(H2020292)Science and Technology Planning of Baiyin City,Fundamental Research Funds for the Central Universities (buctrc202208)+2 种基金Engineering Research Center of Non-metallic Minerals of Zhejiang Province and the Beijing Engineering Center for Hierarchical Catalysts. Central Government Guiding Funds for Local Science and Technology Development (2022ZY015)Nanjiang Technology Project(2023AB028)Open Laboratory of State Key Laboratory of Organic and Inorganic Composites (oic-202301006)。
文摘Coupling adsorption and in-situ Fenton-like oxidation process was developed for Methylene blue(MB) using refined iron-containing lowgrade attapulgite(ATP) clay, and the removal mechanism was investigated. The MB was initially adsorbed on the porous ATPs, and then the enriched MB was removed by the H2O2-assisted Fenton-like oxidation with the iron-containing ATP catalyst. Under optimal conditions, the ATP powder exhibits the maximum removal efficiency of 100% with negligible iron leaching(1.5 mg L^(-1)) and no sludge formation. Furthermore,polysulfone/ATP(PSF/ATP) pellets were fabricated through a water-induced phase separation process to construct a fixed-bed reactor(FBR) for continuous contaminant removal. For the first cycle, the maximum adsorption capacity was 15.5 L with an outlet MB concentration of1.973 mg L-1(< 2 mg L^(-1), GB4287-2012) using the PSF/ATP pellets containing 50.0 g of ATP powders, and the maximum Fenton-like oxidation capacity was 35.5 L with the outlet concentration of 0.831 mg L^(-1). After five cycles, the total treated volume of the MB solution was ca. 255 L, and the efficiency remained above 99%. After 10 h of continuous treatment towards practical resin industrial wastewater, the chemical oxygen demand(COD) removal efficiency was still measured at 83.05%, costing 0.398 $ m^(-3). These results demonstrate the practical applicability of iron-containing low-grade ATP clay for textile water treatment.
基金supported by the National Natural Science Foundation of ChinaProgramme XU GuangqiProgram for Changjiang Scholars and Innovative Research Team in University (No. IRT1205)
文摘Flower-like hierarchical three-dimensional Ni Fe layered double hydroxides hollow microspheres(3D NiFe-LDH HMS),as one kind of novel non-noble metal electrocatalysts,have been fabricated in a templatefree route for water oxidation.Both of the concentration of ammonium fluoride and the reaction time are adjusted to obtain a series of Ni Fe-LDH microspheres,with different internal structures from massive to hollow generated during the hydrothermal treatment,which improve the electrocatalytic activity of the Ni Fe-LDH catalysts towards the evolution reaction of oxygen.The optimized Ni Fe-LDH-0.4M HMS show the excellent OER performance in alkaline electrolyte withη=290 mV@10 mA cm^-2,and a Tafel slope of 51 mV dec-1,which outperforms the benchmark RuO2 catalyst.The possible reason is attributed to the more exposure of active sites,and fast ion transport resulting from the hierarchical hollow structure.
基金supported by the National Key R&D Program of China(No.2016YFB0301600)the National Natural Science Foundation of China,the Fundamental Research Funds for the Central Universities(JD1716,12060093063)+1 种基金the Programme XU Guangqi(Code Projet:45644RC)the financial support from the China Scholarship Council。
文摘CeO_(2)decorated CoOx rod-like hybrid,supported onto holey reduced graphene(CoOx/CeO_(2)/RGO)composite,was fabricated via a surfactant-assisted route.Its corresponding electrocatalytic performance towards oxygen reduction/evolution reactions(ORR and OER)was systematically investigated in alkaline electrolyte.Structural,morphological and compositional studies revealed changes in electronic and surface properties when CeO_(2)was introduced as an oxygen buffer material.The oxygen vacancies effectively enhanced the electrocatalytic activity,while the synergistic effect of co-catalyst CeO_(2),CoOx activecenters,and defective graphene with many voids facilitate the charge/mass transfer,making CoOx/CeO_(2)/RGO an efficient and stable bifunctional electrocatalyst for OER/ORR with△E=0.76 V(△E=E10mAcm.-2OER-E_(1/2).ORR).This parameter is 70 mV and 270 mV lower than CoOx/RGO and the benchmark Pt/C,respectively.In addition,the OER/ORR bifunctionality of CoOx/CeO_(2)/RGO composite outperforms that of Pt/C catalyst in a H2-O_(2)micro fuel cell platform.
基金the support by the Fundamental Research Funds for the Central Universities(ZY2117)financial support from the European Union(ERDF)‘Région Nouvelle Aquitaine’+2 种基金the financial support from the projects CIIEMAD-SIP-IPN No.20196152 and20220825Yfinancial support from the Joint Funds of the National Natural Science Foundation of China(ZK20180055)Programs for Foreign Talent(G2021106012L)。
文摘Bimetallic cobalt-nickel sulfide nanoparticles anchored on S-,N-codoped holey carbon nanosheets(CoNiS-T@NCFs)with a hydrangea-like morphology,were synthesized via a confinement synthesis route,in which an intercalated LDH precursor was subjected to the interlayer-confined carbonization and host-layer sulfurization.The phase transformation and structure evolution(e.g.,atom site occupancy,crystallite size,and cell volume)of the CoNi-S-T@NCFs electrocatalysts,as a function of sulfurization temperatures,were confirmed by X-ray diffraction and Rietveld analyses.The sulfur vacancies effectively enhance the electrocatalytic activity,while the synergistic effect of(Co,Ni)7 S8 alloy and S,N-codoped carbon matrix facilitates the electron transfer and accelerates reaction kinetics,making CoNi-S-900@NCFs an efficient and stable bifunctional electrocatalyst for oxygen reduction reaction(ORR).The rich highvalence Co(Ⅲ)and Ni(Ⅲ)of CoNi-S-900@NCFs facilitates the in-situ transformation of the metal(oxy)hydroxides intermediates with high catalytic activity for oxygen evolution reaction(OER).Thus,with a bifunctional parameter,ΔE,of 0.75 V(E_(j=10,OER)-E_(1/2,ORR)),this electrocatalyst slightly outperforms the state-of-the-art commercial Pt/C+RuO_(2)/C catalyst(ΔE=0.76 V)in alkaline medium.This work demonstrates the influence that the sulfurization temperature has on the relationship between the structure and electrocatalytic performance of bimetallic sulfides prepared by the synthesis strategy using the intercalated LDH precursor.This strategy can be extended to prepare other chalcogenides with binary or ternary transition metals.
基金Supported by the National Natural Science Foundation of China(21676022)the Fundamental Research Funds for the Central Universities(BHYC170A&JD701)
文摘The present paper reports a new fluoride-free and energy-saving lead electrolytic refining process in order to solve the serious problems of the existing Betts lead electrorefining process, such as low production efficiency,high energy consumption and fluorine pollution. In the process, a mixed solution of perchloric acid and lead perchlorate(HClO4-Pb(ClO4)2) with the additives of gelatin and sodium lignin sulfonate is employed as the new electrolyte. The cathodic polarization curves show that HClO4 is very stable, and there is no any reduction reaction of HClO4 during the electrolytic process. The redox reactions of lead ions in HClO4 solution are very reversible with an ultrahigh capacity efficiency, so the HClO4 acts as a stable support electrolyte with higher ionic conductivity than the traditional H2SiF6 electrolyte. The results of the scale-up experiments show that under the optimal conditions of 2.8 mol·L-1 HClO4, 0.4 mol·L-1 Pb(ClO4)2 and electrolysis temperature of 45 ℃, the energy consumption is as low as 24.5 kW·h·(t Pb)-1 , only about 20% of that by Betts method at the same current density of 20 mA·cm-2, and the purity of the refined lead is up to 99.9992%, much higher than that specified by Chinese national standard(99.994%, GB/T 469-2013) and European standard(99.99%, EN 12659–1999).
基金supported by the National Natural Science Foundation of China(Nos.31472013 to WL,31660617 to LW,31460567 to AJ,and 31572257 to HH)Key Scientific and Technological Project of Science and Information Technology of Haizhu district,Guangzhou City(2013-cg-03 to ZD,2014-cg-17 to HH)GDAS Special Project of Science and Technology Development(2017GDASCX-0107)
文摘Background:The adjustment of sex ratios in birds can occur at the egg and nestling stages. Previous studies showed that the sex ratio was affected by environmental factors and parental condition; it may result in seasonal and ecosystem differences.Methods:In this study, the brood sex ratio of the Yellow-bellied Prinia(Prinia flaviventris) in the Nonggang area, Guangxi, southwestern China, was investigated during the breeding season from May to June in 2013 using PCR amplification from whole-genome DNA extracted from blood samples. A total of 31 nests of Yellow-bellied Prinia, including 132 brood fledglings and 31 pairs, were sampled.Results:The results showed that the brood sex ratio of the Yellow-bellied Prinia was 1:1, and sex ratios of different nests were evenly distributed within the study area. No significant relationship was found between parental quality and nest characteristics with the brood sex ratio.Conclusions:The present study indicated that no brood sex ratio bias in the Yellow-bellied Prinia highlighted the complexity of sex ratio adjustment in birds. In spite of our negative results, the lack of an association between brood sex ratio and parental quality and environmental factors in the Yellow-bellied Prinia provides valuable information on the adjustment of sex ratios in birds.
基金the financial support from the Research Foundation for Talented Scholars of Hainan University(YEAZ22091)the financial supports from the Joint Funds of the National Natural Science Foundation of China(ZK20180055)+1 种基金the Programs for Foreign Talent(G2021106012L)the National Natural Science Foundation of China(22075290)。
文摘Carbon-based N-coordinated Mn(Mn-N_(x)/C)single-atom electrocatalysts are considered as one of the most desirable non-precious oxygen reduction reaction(ORR)candidates due to their insignificant Fenton reactivity,high abundance,and intriguing electrocatalytic performance.However,current MnN_(x)/C single-atom electrocatalysts suffer from high overpotentials because of their low intrinsic activity and unsatisfactory chemical stability.Herein,through an in-situ polymerization-assisted pyrolysis,the Co as a second metal is introduced into the Mn-N_(x)/C system to construct Co,Mn-N_(x)dual-metallic sites,which atomically disperse in N-doped 1D carbon nanorods,denoted as Co,Mn-N/CNR and hereafter.Using electron microscopy and X-ray absorption spectroscopy(XAS)techniques,we verify the uniform dispersion of CoN4and MnN4atomic sites and confirm the effect of Co doping on the MnN_(4) electronic structure.Density functional theory(DFT)calculations further elucidate that the energy barrier of ratedetermining step(^(*)OH desorption)decreases over the 2 N-bridged MnCoN_(6) moieties related to the pure MnN_(4).This work provides an effective strategy to modulate the local coordination environment and electronic structure of MnN_(4) active sites for improving their ORR activity and stability.
基金supported by the National Natural Science Foundation of China(31271636)the China Agriculture Research System(CARS-04)。
文摘Soybean(Glycine max[L.]Merr.)is a food and oil crop whose growth and yield are influenced by root and nodule development.In the present study,Gm NMHC5 was found to promote the formation of nodules in overexpressing mutants.In contrast,the number of nodules in Gmnmhc5 edited with CRISPR/Cas9 decreased sharply.In 35 S:Gm NMHC5 mutants,expression levels of genes involved in nodulation were significantly up-regulated.Both in vitro and in vivo biochemical analyses showed that Gm NMHC5 directly interacted with Gm GAI(a DELLA protein),and the content of gibberellin 3(GA_(3))in overexpressing mutants was lower than that in the wild type.These results revealed that Gm NMHC5 participates in the classical GA signaling pathway,and may regulate the content of GA_3 to match the optimal concentration required for nodule formation,thereby promoting nodulation by directly interacting with Gm GAI.A model illustrating the mechanism by which Gm NMHC5 promotes soybean nodulation is presented.
基金Supported by the Project of Research on Medical Simulation Education and Teaching of Higher Vocational Colleges in Guangdong Province(2022MYLX060).
文摘According to the problems such as low level and depth of experimental teaching research of Mongolian medicine in higher vocational colleges, lack of applicable teaching model mold, lack of students practical operation in time, and single teaching, the development direction and ideas of bloodletting model mold in Mongolian medicine in vocational Mongolian medicine teaching were proposed to provide valuable reference for the experimental teaching reform of traditional therapy of Mongolian medicine and the teaching reform and development ideas of Mongolian medicine and other traditional medicine.
基金supported by National Natural Science Foundation of China(22478031).
文摘Echinacoside(ECH),a representative phenylethanol glycoside,exhibits diverse pharmacological properties and is used in the treatment of neurodegenerative disorders(e.g.,Parkinson’s and Alzheimer’s diseases),ischemic brain injury,and cancer.The growing therapeutic demand for ECH has highlighted the need for scalable production.However,conventional methods face major limitations:chemical synthesis is hindered by the compound’s structural complexity,and the yield of ECH extracted from plants is naturally low due to the host-dependent growth of Cistanche deserticola(C.deserticola),a parasitic desert plant.To establish a sustainable microbial production platform,we first deciphered the biosynthetic pathway of ECH in C.deserticola by integrating metabolomics analyses of plant tissues and callus cultures.This enabled the identification of key precursors,enzymatic steps,and regulatory mechanisms.Leveraging this knowledge,we engineered the pathway in Saccharomyces cerevisiae,achieving de novo ECH biosynthesis at a titer of 7.52±1.42 mg/l.This study lays the foundation for industrial-scale ECH production and deepens our understanding of bioactive compound biosynthesis in parasitic plants,offering insights for future pathway engineering efforts.
基金supported by the National Natural Science Foundation of China,the Programme XU Guangqi(Code Projet:45644RC)the Fundamental Research Funds for the Central Universities(JD1716,12060093063)+1 种基金H.H.Zhong specially acknowledges the financial support from the China Scholarship Council.Xiao-Wei Song thanks the University Natural Science Research Project of Anhui Province(grant number KJ2019A0549)the talent introduction fund of Anqing Normal University(grant number 150002019)for financial support.
文摘Herein,FeCo bimetallic organic frameworks(MOFs)with different compositions were fabricated by controlling the initial molar ratio of Fe^(3+)/Co^(2+)ions.Through a one-step carbonization treatment of FeCo MOFs and the melamine mixture,a series of FeCo nanoalloys encapsulated in bamboo-like N-doped carbon nanotubes(CNTs).
基金supported by the National Natural Science Foundation of China(21571015,21627813)the Fundamental Research Funds for the Central Universities(JD1716,12060093063)the Program for Changjiang Scholars and Innovative Research Team in University(No.IRT1205).
文摘It is of great and increasing interest to develop multifunctional additives to enhance the anti-aging performance of polypropylene(PP)and then enlarge its application fields.Here,a hindered amine light stabilizer(H for HALS)and a hindered phenolic antioxidant(D for DBHP)with low molecular weight were co-intercalated into layered double hydroxides(LDHs)through a coprecipitation method to produce a series of inorganic–organic hybrid materials Zn2Al-HxDy-LDH,adjusting the anion ratio(x+y=1 and x:y=0:1,1:0,1:1,2:1,1:2).Subsequently,hybrid material LDH fillers(HALS-LDH,DBHP-LDH,HxDy-LDH,and(H-LDH)x(D-LDH)y),used as anti-aging agents,were successively dispersed into PP by two methods:solvent mixing/casting and extrusion mixing.The corresponding crystalline structure,morphological,rheological properties and thermal and light oxidative degradation behaviour were carefully investigated using various techniques such as XRD,TEM and rheology.The results showed that the LDH fillers were well dispersed into PP without any influence on its crystallization behavior and provided a chain extension effect on PP,and this is even more pronounced for HxDy-LDH.The thermal stability of HxDy-LDH/PP composites(x:y=1:1,2:1,1:2)is significantly improved,compared with that of other composites.Moreover,through the accelerated aging test,the co-intercalated hybrid material HxDy-LDH significantly inhibited the oxidative degradation of PP(thermal-aging and light-aging).The concomitant presence of HALS/DBHP co-intercalated within the LDH structure strongly improved the anti-aging performance of PP.Therefore,such a co-intercalated I/O hybrid adaptive system as a multifunctional additive agent opens the pathway for potential future research of high-performance PP associated with hybrid fillers.
基金supported by the National Key Research and Development Program of China(2022YFA1503400,2016YFB0301600)National Natural Science Foundation of China(21627813).
文摘Developing efficient Pt-free electrocatalysts for hydrogen evolution reaction(HER)at all pHs remains challenging for large-scale hydrogen production,especially in alkaline and neutral conditions,because of sluggish water dissociation.Herein,the synthesis of novel highly dispersed RuO_(-2) nanoparticles on NiO nanosheet arrays(RuO_(-2)/NiO/NF)with efficient pH-universal HER electrocatalysis via a simple in situ growth and sequential calcination process is reported.The as-prepared RuO_(-2)/NiO/NF nanosheet arrays exhibit outstanding HER performance with overpotentials of 31,66,and 84 mV to deliver 10,100,and 300 mA cm^(-2),respectively,in 1.0 M KOH,outperforming even the commercial Pt/C electrocatalyst.In addition,RuO_(-2)/NiO/NF shows a higher turnover frequency at an overpotential of 100 mV in comparison with Pt/C electrocatalyst.It also requires extremely low overpotentials of 98 mV and 254 mV to afford 300 mA cm^(-2) in 0.5 M H_(2)SO_(4) and 1.0 M PBS-neutral solution,respectively.Moreover,RuO_(-2)/NiO/NF can work at 100 mA cm^(-2) for 200 h with negligible decay in 1.0 M KOH.The splendid HER performance can be ascribed to the 3D nanosheet arrays and highly dispersed RuO_(-2) nanoparticles with richly exposed active sites,favoring the efficient electron and mass transfer to the active sites.
基金supported by National Key R&D Program of China(No.2016YFB0301600)the National Natural Science Foundation of China(21627813)+1 种基金the Fundamental Research Funds for the Central Universities(JD1716,12060093063)Distinguished Professor of Kunlun Scholars in Tarim University.
文摘Five boehmite adsorbents with high percentage of exposed(020)facets and large specific surface area were prepared by the separate nucleation and aging steps(SNAS)method at different rotating speeds,namely B-n(n=rotating speeds)from 500 to 1500 rpm of the rotating liquidfilm reactor(RLFR).From 500 rpm to 1500 rpm,both specific surface area and percentage of exposed(020)facets increased by ca.10.8%and 16.9%,respectively.For all the samples,the adsorption behavior followed the pseudo-second order model and Langmuir isotherm model towards Congo red(CR).The B-1500 sample exhibited the best adsorption performance for CR with the maximum adsorption quantity of 1298.3 mg g^(−1) in neutral pH solution because of the smallest average particle size(d=55.6 nm),highest specific surface area(BET=224.42 m^(2)g^(−1)),and highest percentage of exposed(020)facets(55.18%).In particular,the boehmite pellets shaped with the alginate-assisted moulding method showed promising practical applications for the removal of CR in water through afixed-bed adsorption column;for example,ca.600 mL of boehmite pellets including ca.15.0 g of boehmite powder has the removal effciency of 75%in 3500 mL of aqueous solution with 100 mg L^(−1)CR.
文摘Correction for‘Design,fabrication and anti-aging behavior of a multifunctional inorganic-organic hybrid stabilizer derived from co-intercalated layered double hydroxides for polypropylene’by Qian Zhang et al.,Inorg.Chem.Front.,2019,6,2539-2549.
基金supported by National Key R&D Program of China(No.2016YFB0301600)the National Natural Science Foundation of China,and the Fundamental Research Funds for the Central Universities(12060093063).S.Ahmed specially thanks the financial support from Chinese Scholarship Council.
文摘A series of hierarchical flower-like magnesium oxide(MgO)microspheres were prepared with an ethylene glycol(EG)-assisted route at room temperature using ammonia as a precipitating agent.Effects of the ethylene glycol(EG)ratio on the structure,morphology and pore properties were carefully investigated.
基金National Key R&D Program of China(grant No.2022YFA1503400)Lanzhou Petrochemical Research Center project,and Programs for Foreign Talent(grant No.G2021106012L).
文摘The pore structure of spherical alumina supports is closely related to the dispersion of catalytically active components and the diffusion of reactants.Maintaining excellent pore structure under strict reaction conditions is of utmost importance.In this work,sphericalγ-Al_(2)O_(3)support with a bimodal pore structure,composed of macropores and mesopores,was successfully synthesized using dodecane as the pore-forming agent through the oil–ammonia column-shaping method.The morphology and internal pore structure of the alumina were found to be influenced by the amount of surfactant added and ultrasound treatment conditions.Notably,when concentration of surfactant was 4‰and ultrasound voltage of 20 V was applied,the resultingγ-Al_(2)O_(3)-4‰-20 displayed a highly concentrated distribution of macropores with an average pore size of 100 nm,resulting in an impressive porosity of 69.21%.In contrast,the untreated sample ofγ-Al_(2)O_(3)-0-0 only exhibited a mesoporous distribution with a porosity of 54.03%.Moreover,after being subjected to a hydrothermal treatment in a high temperature(600°C)and high humidity(water vapor)environment for 120 h,theγ-Al_(2)O_(3)-4‰-20 sample maintained a high BET specific surface area of 170.9 m^(2)g^(−1)and mercury intrusion porosimetry specific surface area of 263.3 m^(2)g^(−1).
基金funded by Beijing Engineering Center for Hierarchical Catalysts,Nanjiang Technology Project(grant No.2023AB028)Open Laboratory of State Key Laboratory of Organic and Inorganic Composites(grant No.oic-202301006)+1 种基金the CSC scholarship program(grant No.2018GXz021558)distinguished professor of Kunlun Scholars in Tarim University.
文摘Hierarchical porous magnesium silicate hydrate (MSH) microspheres composed of sheets are successfully developed under facile conditions using a hard template. The role of hexadecyltrimethylammonium bromide (CTAB) on the formation and adsorption behavior was also observed for the methyl orange and methylene blue. The formed MSH possesses a surface area of 453.24 m^(2)/g, an average pore size of 6.38 nm, and a pore volume of 0.75 cm^(3)/g without CTAB. Based on the role of CTAB and the change in the ratio of Mg/Si, the MSH retained its sphere-like structure with a variation in pore parameters. The formed MSH was used as an adsorbent to remove methylene blue and methyl orange. The pseudo-second-order kinetic and Langmuir Isotherm models are well-fitted, with a 256.4 mg/g removal capacity and 84.2 mg/g for methylene blue and methyl orange, respectively. The modified MSH with CTAB played a positive role for the methyl orange and a negative role for the methylene blue regarding removal performance.
