Cu/Zn/Al/Zr catalysts containing Cu in three valence states(Cu2+,Cu+and Cu0)were prepared usinga liquid reduction method and subsequently calcined at different temperatures.The effects of thecalcination temperature on...Cu/Zn/Al/Zr catalysts containing Cu in three valence states(Cu2+,Cu+and Cu0)were prepared usinga liquid reduction method and subsequently calcined at different temperatures.The effects of thecalcination temperature on the catalyst structure,interactions among components,reducibility anddispersion of Cu species,surface properties and exposed Cu surface area were systematically investigated.These materials were also applied to the synthesis of methanol via the hydrogenation ofCO2.The results show that a large exposed Cu surface area promotes catalytic CO2conversion andthat there is a close correlation between the Cu+/Cu0ratio and the selectivity for methanol.A calcinationtemperature of573K was found to produce a Cu/Zn/Al/Zr catalyst exhibiting the maximumactivity during the synthesis of methanol.展开更多
In this paper,we report our attempts to raise the efficiency of liquid reduction method when using high specific surface area TiO2(HSTiO2)by doping Au.Characterization of Au-HSTiO2 was conducted via XRD,UV-vis,SEM,and...In this paper,we report our attempts to raise the efficiency of liquid reduction method when using high specific surface area TiO2(HSTiO2)by doping Au.Characterization of Au-HSTiO2 was conducted via XRD,UV-vis,SEM,and photocurrent intensity.The experimental results show that Au-HSTiO2 exhibits prominently higher photocatalytic hydrogen production than TiO2 and HSTiO2.Enhanced photosynthetic hydrogen production ability of Au-HSTiO2 should be attributed to the presence of abundant surface active sites of HSTiO2,remarkably extending electronic holes in Au doping.This study provides a promising photosynthetic material for hydrogen production.展开更多
Nano metal materials have been widely explored to be applied in medical,environmental,and material science.Among these nanoparticles,especially silver nanoparticles(AgNPs),have drawn increasing attention for antimicro...Nano metal materials have been widely explored to be applied in medical,environmental,and material science.Among these nanoparticles,especially silver nanoparticles(AgNPs),have drawn increasing attention for antimicrobial applications.Most researchers are keen on the development of the biologically friendly capping reagents for the synthesis of AgNPs,instead of unfriendly organic polymers.In this study,the liquid chemical reduction method was used to synthesize AgNPs with edible whey protein isolate(WPI)as a capping reagent.These WPI-AgNPs had a broad size distribution(average diameter of 138.6 nm),and their dimensions could be readily controlled in the range of 22.5-149.6 nm by introducing different concentrations of chloride.Subsequently,it was confirmed that WPI-AgNPs were formed through two mechanisms,which were respectively reduced in situ(without the addition of NaCl)and ex situ(in presence of NaCl)to yield silver nanoparticles.The WPI-AgNPs synthesized in presence of 10 mM of NaCl as mediation reagent were stable at room temperature or 4℃ up to 3 months.Furthermore,the synthesized WPI-AgNPs had a good antibacterial activity toward pathogens including Gram-negative E.coli and Gram-positive S.aureus.The results shed light on method and capping reagent to stabilize silver nanoparticles,which highlighted the potential of WPI and chloride in metal nanoparticle synthesis.展开更多
基金supported by the Key Science and Technology Program of Shanxi Province,China (MD2014-10)the National Key Technology Re-search and Development Program (2013BAC11B00)the National Natural Science Foundation of China (21343012)~~
文摘Cu/Zn/Al/Zr catalysts containing Cu in three valence states(Cu2+,Cu+and Cu0)were prepared usinga liquid reduction method and subsequently calcined at different temperatures.The effects of thecalcination temperature on the catalyst structure,interactions among components,reducibility anddispersion of Cu species,surface properties and exposed Cu surface area were systematically investigated.These materials were also applied to the synthesis of methanol via the hydrogenation ofCO2.The results show that a large exposed Cu surface area promotes catalytic CO2conversion andthat there is a close correlation between the Cu+/Cu0ratio and the selectivity for methanol.A calcinationtemperature of573K was found to produce a Cu/Zn/Al/Zr catalyst exhibiting the maximumactivity during the synthesis of methanol.
基金financially supported by the National Natural Science Foundation of China(Nos.31540035,61308095,21801092,and 11904128)the Program for the Development of Science and Technology of Jilin Province(Nos.20180520002JH and 20190103100JH)+1 种基金the 13th Five-Year Program for Science and Technology of Education Department of Jilin Province(Nos.JJKH20180769KJ and JJKH20180778KJ)the Graduate Innovation Project of Jilin Normal University(No.201941)。
文摘In this paper,we report our attempts to raise the efficiency of liquid reduction method when using high specific surface area TiO2(HSTiO2)by doping Au.Characterization of Au-HSTiO2 was conducted via XRD,UV-vis,SEM,and photocurrent intensity.The experimental results show that Au-HSTiO2 exhibits prominently higher photocatalytic hydrogen production than TiO2 and HSTiO2.Enhanced photosynthetic hydrogen production ability of Au-HSTiO2 should be attributed to the presence of abundant surface active sites of HSTiO2,remarkably extending electronic holes in Au doping.This study provides a promising photosynthetic material for hydrogen production.
基金This work was supported by National Key Research and Development Program of China(2017YFC1601704)National Natural Science Foundation of China(31522044,31671909,31772034,and 31901630)+4 种基金Program of Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment&Technology(FMZ201904)National First-class Discipline Program of Food Science and Technology(JUFSTR20180205)Natural Science Foundation of Jiangsu Province-Youth Program(BK20190583)Fundamental Research Funds for the Central Universities(JUSRP12007)Jiangsu Planned Projects for Postdoctoral Research Funds(2020Z047).
文摘Nano metal materials have been widely explored to be applied in medical,environmental,and material science.Among these nanoparticles,especially silver nanoparticles(AgNPs),have drawn increasing attention for antimicrobial applications.Most researchers are keen on the development of the biologically friendly capping reagents for the synthesis of AgNPs,instead of unfriendly organic polymers.In this study,the liquid chemical reduction method was used to synthesize AgNPs with edible whey protein isolate(WPI)as a capping reagent.These WPI-AgNPs had a broad size distribution(average diameter of 138.6 nm),and their dimensions could be readily controlled in the range of 22.5-149.6 nm by introducing different concentrations of chloride.Subsequently,it was confirmed that WPI-AgNPs were formed through two mechanisms,which were respectively reduced in situ(without the addition of NaCl)and ex situ(in presence of NaCl)to yield silver nanoparticles.The WPI-AgNPs synthesized in presence of 10 mM of NaCl as mediation reagent were stable at room temperature or 4℃ up to 3 months.Furthermore,the synthesized WPI-AgNPs had a good antibacterial activity toward pathogens including Gram-negative E.coli and Gram-positive S.aureus.The results shed light on method and capping reagent to stabilize silver nanoparticles,which highlighted the potential of WPI and chloride in metal nanoparticle synthesis.
