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Understanding the multifunctionality in Cu-doped BiVO_4 semiconductor photocatalyst
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  • 英文篇名:Understanding the multifunctionality in Cu-doped BiVO_4 semiconductor photocatalyst
  • 作者:Chhabilal ; Regmi ; Yuwaraj ; K.Kshetri ; Ramesh ; Prasad ; PANDey ; Tae-Ho ; Kim ; Gobinda ; Gyawali ; Soo ; Wohn ; Lee
  • 英文作者:Chhabilal Regmi;Yuwaraj K.Kshetri;Ramesh Prasad PANDey;Tae-Ho Kim;Gobinda Gyawali;Soo Wohn Lee;Department of Environmental and Biochemical Engineering, Sun Moon University;Department of Advanced Materials Engineering, Sun Moon University;Institute of Biomolecule Reconstruction, Department of BT-Convergent Pharmaceutical Engineering, Sun Moon University;Division of Mechanics and ICT Convergence Engineering, Sun Moon University;
  • 英文关键词:BiVO_4;;Photocatalyst;;Methylene Blue;;Ibuprofen;;Escherichia coli;;First principle calculation
  • 中文刊名:HJKB
  • 英文刊名:环境科学学报(英文版)
  • 机构:Department of Environmental and Biochemical Engineering, Sun Moon University;Department of Advanced Materials Engineering, Sun Moon University;Institute of Biomolecule Reconstruction, Department of BT-Convergent Pharmaceutical Engineering, Sun Moon University;Division of Mechanics and ICT Convergence Engineering, Sun Moon University;
  • 出版日期:2018-12-14
  • 出版单位:Journal of Environmental Sciences
  • 年:2019
  • 期:v.75
  • 基金:supported by the Global Research Laboratory Program of the National Research Foundation of Korea (NRF);; funded by the Ministry of Education,Science and Technology (MEST) of Korea (No.2010-00339)
  • 语种:英文;
  • 页:HJKB201901007
  • 页数:14
  • CN:01
  • ISSN:11-2629/X
  • 分类号:87-100
摘要
A visible light-induced, Cu-doped BiVO_4 photocatalyst was synthesized by a microwave hydrothermal method. The photocatalytic efficiency was investigated in the degradation of model water pollutants like Methylene Blue(dye) and ibuprofen(pharmaceuticals), as well as the inactivation of Escherichia coli(bacteria). The Cu-doped BiVO4 samples showed better efficiency than undoped BiVO_4, and the 1 wt.% Cu-doped BiVO_4 sample showed the best efficiency. The degradation of Methylene Blue reached 95%, while the degradation of ibuprofen reached 75%, and the inactivation of E. coli reached 85% in irradiation with visible light. The appearance of additional absorption band shoulders and widening of the optical absorption in the visible range makes the prepared powder an efficient visible light-driven photocatalyst. Moreover, the formation of an in-gap energy state just above the valance band as determined by density functional theory(DFT) first principle calculation, facilitates the wider optical absorption range of the doped system. Similarly, this in-gap energy state also acts as an electron trap, which is favorable for the efficient separation and photoexcited charge carriers' transfer process. The formation of oxygen vacancies due to doping also improved the separation of the charge carrier, which promoted the trapping of electrons and inhibited electron hole recombination, thus increasing the photocatalytic activity. No decrease in the efficiency of the 1 wt.% Cu-doped BiVO_4 photocatalyst in the degradation of ibuprofen over three consecutive cycles revealed the stability of the photocatalyst towards photocorrosion. These findings highlight the multifunctional applications of Cu-doped BiVO_4 in wastewater containing multiple pollutants.
        A visible light-induced, Cu-doped BiVO_4 photocatalyst was synthesized by a microwave hydrothermal method. The photocatalytic efficiency was investigated in the degradation of model water pollutants like Methylene Blue(dye) and ibuprofen(pharmaceuticals), as well as the inactivation of Escherichia coli(bacteria). The Cu-doped BiVO4 samples showed better efficiency than undoped BiVO_4, and the 1 wt.% Cu-doped BiVO_4 sample showed the best efficiency. The degradation of Methylene Blue reached 95%, while the degradation of ibuprofen reached 75%, and the inactivation of E. coli reached 85% in irradiation with visible light. The appearance of additional absorption band shoulders and widening of the optical absorption in the visible range makes the prepared powder an efficient visible light-driven photocatalyst. Moreover, the formation of an in-gap energy state just above the valance band as determined by density functional theory(DFT) first principle calculation, facilitates the wider optical absorption range of the doped system. Similarly, this in-gap energy state also acts as an electron trap, which is favorable for the efficient separation and photoexcited charge carriers' transfer process. The formation of oxygen vacancies due to doping also improved the separation of the charge carrier, which promoted the trapping of electrons and inhibited electron hole recombination, thus increasing the photocatalytic activity. No decrease in the efficiency of the 1 wt.% Cu-doped BiVO_4 photocatalyst in the degradation of ibuprofen over three consecutive cycles revealed the stability of the photocatalyst towards photocorrosion. These findings highlight the multifunctional applications of Cu-doped BiVO_4 in wastewater containing multiple pollutants.
引文
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