Fabrication Of Nano Bismuth Vanadate-based Photocatalysts And Study On Their Photocatalytic Performance

Currently,the environmental problems and the shortage of fossil energy issues are restricting the development of society.On the one hand,fossil energy are non-renewable resources.On the other hand,environmental problems such as water and air pollution are threatening human health seriously.Photocatalysis technique applied to environmental area has aroused a vast concern for recent years,which can utilize solar energy to realize the production of hydrogen or degradation of organic pollutants.Bismuth vanadate(BiVO4)has obtained considerable attention due to its excellent properties,such as non-toxic,narrow band gap(Eg = 2.4 eV),good dispersibility,and higher sunlight utilization.Base on the above analysis,we studied the preparation and photocatalytic properties of BiVO4 in this paper.The main conclusions were listed as follows:1.Different morphology of BiVO4 were prepared by hydrothermal method and alcohol-thermal method.The optimal sample of BiVO4 is synthesized when pH was 7 with sodium polyphosphate by hydrothermal method,and when the volume fraction of glycerol is 50%by alcohol-thermal method.2.The silkworm chrysalis shaped Ag3PO4/BiVO4 samples were prepared via alcohol-thermal process with glycerol.0.5mmol Ag3PO4/BiVO4,1mmol Ag3PO4/BiVO4,2mmol Ag3PO4/BiVO4,3mmol Ag3PO4/BiVO4 photocatalyst were obtained by adjusting the amount of AgNO3.MB degradation rate can reach 93.48%in 60 min on 2mmol Ag3PO4/BiVO4,which is about 1.15 times higher than that of pure BiVO4.3.The straw-shaped Ag4V2O7/BiVO4 sanples were prepared via hydrothermal process.0.02-Ag4V2O7/BiVO4,0.04-Ag4V2O7/BiVO4,0.06-Ag4V2O7/BiVO4,0.08-Ag4V2O7/BiVO4 and 0.10-Ag4V207/BiVO4 photocatalyst were obtained by adjusting the amount of AgNO3.Ag4V2O7/BiVO4 nanocomposites with straw-shaped were applied in photocatalytic degradation of MB and removal of NO.The Ag4V2O7/BiVO4 heterojunction displayed excellent visible light harvesting property,lower recombination rate of photo-generated electrons and holes,and higher degradation rate for MB and higher removal rate for NO.MB degradation rate can reach 98.48%in 60 min and NO oxidation rate can reach 52.83%in 30 min on 0.08-Ag4V2O7/BiVO4,which are about 1.24 and 3.11 times higher than that of pure BiVO4 respectively.h+ and ·O2-as active species play important roles during MB degradation and NO oxidation.The main point of this article is synthesized different morphology of BiVO4,and then combined with Ag4V2O7 and Ag3PO4 to enhance its photocatalytic performance.The enhancement could be mainly attributed to the effective separation of photogenerated electrons across heterojunctioa This work provides a new insight on developing active BiVO4-based photocatalysts and demonstrates the great potential of using Ag4V2O7/BiVO4 heterojunction for efficient environment,al remediation.