A series of Z-schemeβ-Bi_(2)O_(3)/ZrO_(2)hetero-junction composites containing three-dimensional(3D)mesoporous silica nanospheres(MSNs)were synthesized as efficient catalysts for antibiotic remediation.The obtained M...A series of Z-schemeβ-Bi_(2)O_(3)/ZrO_(2)hetero-junction composites containing three-dimensional(3D)mesoporous silica nanospheres(MSNs)were synthesized as efficient catalysts for antibiotic remediation.The obtained MSN/β-Bi_(2)O_(3)/ZrO_(2)ternary composites possess novel lamellar cross structure,which is well constructed byβ-Bi_(2)O_(3)nanosheets,3D MSNs,and ZrO_(2)nanoparticles.The optimal sample BZS-2(Bi∶Zr∶Si=1∶0.4∶0.33)shows an adsorptive-photocatalytic removal efficiency of 92.7%towards levofloxacin(LVF)and a total organic carbon(TOC)removal efficiency of 60.0%under simu-lated solar light irradiation for 100 min.BZS-2 can also remove 90.1%and 91.2%of tetracycline hydrochloride(TC)and oxytetracycline hydrochloride(OTC),respectively,and themaximum adsorptioncapacityof TCover BZS-2is almost 10 times that of-BiO.Theimprovement ofphotocatalytic activitycan bemainly attributed to the enhanced visible-light adsorption capacity and more efficientseparationof photogenerated electron-hole pairs.A possible Z-scheme photocatalytic mechanism of p BiO/ZrOheterojunctions based on valence band offset(AEvBo)andconduction band offset(EcBo)isproposed.This study provides an efficient way to construct novel mesoporous ternary photocatalyst with increased accessible surface area and active sites for treatment of antibiotics by synergistic adsorption and photocatalysis.展开更多
We discovered that a-chymotrypsin has a promiscuous ability to catalyze the cyclocondensation of aromatic and aliphatic aldehydes with 2-aminobenzamides to afford the corresponding 2,3-dihydroquinazolin-4（1H）-ones s...We discovered that a-chymotrypsin has a promiscuous ability to catalyze the cyclocondensation of aromatic and aliphatic aldehydes with 2-aminobenzamides to afford the corresponding 2,3-dihydroquinazolin-4（1H）-ones successfully in high yields（90%–98%） under alcohol solvent. The catalytic activity of a-chymotrypsin was evaluated through investigating the temperature, the enzyme loading and the ratio of substrates in the enzyme-catalyzed reactions. The present method proves to be efficient and environmentally friendly in terms of short reaction time, high yield, green catalyst and the clean products obtained without further purification processes.展开更多
Electroreduction of small molecules such as CO2,N2,and NO3−is one of the promising routes to produce sustainable chemicals and fuels and store renewable energy,which could contribute to our carbon neutrality goal.Emer...Electroreduction of small molecules such as CO2,N2,and NO3−is one of the promising routes to produce sustainable chemicals and fuels and store renewable energy,which could contribute to our carbon neutrality goal.Emerging multicomponent electrocatalysts,integrating the advantages of individual components of catalysts,are of great importance to achieve efficient electroreduction of small molecules via activation of inert bonds and multistep transformation.In this review,some basic issues in the electroreduction of small molecules including CO2,N2,and NO3−are briefly introduced.We then discuss our fundamental understanding of the rule of interaction in multicomponent electrocatalysts,and summarize three models for multicomponent catalysts,including type I,“a non-catalytically active component can activate or protect another catalytic component”;type II,“all catalytic components provide active intermediates for electrochemical conversion”;and type III,“one component provides the substrate for the other through conversion or adsorption”.Additionally,an outlook was considered to highlight the future directions of multicomponent electrocatalysts toward industrial applications.展开更多
基金financially supported by National Natural Science Foundation of China (Nos.21962006, 21607064 and 21707055)the Youth Key Project of Natural Science Foundation of Jiangxi Province (Nos.20192ACBL20014 and 20192ACBL21011)+1 种基金the Natural Science Foundation of Jiangxi Province (Nos.20181BAB203018 and 20181BAB213010)Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology
文摘A series of Z-schemeβ-Bi_(2)O_(3)/ZrO_(2)hetero-junction composites containing three-dimensional(3D)mesoporous silica nanospheres(MSNs)were synthesized as efficient catalysts for antibiotic remediation.The obtained MSN/β-Bi_(2)O_(3)/ZrO_(2)ternary composites possess novel lamellar cross structure,which is well constructed byβ-Bi_(2)O_(3)nanosheets,3D MSNs,and ZrO_(2)nanoparticles.The optimal sample BZS-2(Bi∶Zr∶Si=1∶0.4∶0.33)shows an adsorptive-photocatalytic removal efficiency of 92.7%towards levofloxacin(LVF)and a total organic carbon(TOC)removal efficiency of 60.0%under simu-lated solar light irradiation for 100 min.BZS-2 can also remove 90.1%and 91.2%of tetracycline hydrochloride(TC)and oxytetracycline hydrochloride(OTC),respectively,and themaximum adsorptioncapacityof TCover BZS-2is almost 10 times that of-BiO.Theimprovement ofphotocatalytic activitycan bemainly attributed to the enhanced visible-light adsorption capacity and more efficientseparationof photogenerated electron-hole pairs.A possible Z-scheme photocatalytic mechanism of p BiO/ZrOheterojunctions based on valence band offset(AEvBo)andconduction band offset(EcBo)isproposed.This study provides an efficient way to construct novel mesoporous ternary photocatalyst with increased accessible surface area and active sites for treatment of antibiotics by synergistic adsorption and photocatalysis.
基金the financial support of the National Natural Science Foundation of China (Nos. 21262002, 21462001 and 21465002)the Program for Changjiang Scholars and Innovative Research Team in University (IRT13054)+1 种基金the Natural Science Foundation of Jiangxi No. 20142BAB203008)the Science and Technology Foundation of the Jiangxi Education Department (Nos. KJLD12006, GJJ14466 and KJLD14050)
文摘We discovered that a-chymotrypsin has a promiscuous ability to catalyze the cyclocondensation of aromatic and aliphatic aldehydes with 2-aminobenzamides to afford the corresponding 2,3-dihydroquinazolin-4（1H）-ones successfully in high yields（90%–98%） under alcohol solvent. The catalytic activity of a-chymotrypsin was evaluated through investigating the temperature, the enzyme loading and the ratio of substrates in the enzyme-catalyzed reactions. The present method proves to be efficient and environmentally friendly in terms of short reaction time, high yield, green catalyst and the clean products obtained without further purification processes.
基金supported by the National Natural Science Foundation of China(22002172 and 22121002)the Beijing Natural Science Foundation(J210020)the Photon Science Center for Carbon Neutrality。
文摘Electroreduction of small molecules such as CO2,N2,and NO3−is one of the promising routes to produce sustainable chemicals and fuels and store renewable energy,which could contribute to our carbon neutrality goal.Emerging multicomponent electrocatalysts,integrating the advantages of individual components of catalysts,are of great importance to achieve efficient electroreduction of small molecules via activation of inert bonds and multistep transformation.In this review,some basic issues in the electroreduction of small molecules including CO2,N2,and NO3−are briefly introduced.We then discuss our fundamental understanding of the rule of interaction in multicomponent electrocatalysts,and summarize three models for multicomponent catalysts,including type I,“a non-catalytically active component can activate or protect another catalytic component”;type II,“all catalytic components provide active intermediates for electrochemical conversion”;and type III,“one component provides the substrate for the other through conversion or adsorption”.Additionally,an outlook was considered to highlight the future directions of multicomponent electrocatalysts toward industrial applications.
