Fabrication of electrochemically-modified BiVO4-MoS2-Co3O4composite film for bisphenol A degradation

• 作者: Yanqing Cong Wenhua Zhang Wenchen Ding Tongtong Zhang Yi Zhang Nianping Chi Qi Wang
• 来源期刊: 环境科学学报（英文版）
• 年，卷（期）: 2021,（4）
• 页码范围: 341-351
• 页数: 11页
• 语种: 英文

摘要

A new electrochemically-modified BiVO4-MoS2-Co3O4(represented as E-BiVO4-MoS2-Co3O4)thin film electrode was successfully synthesized for environmental application.MoS2 and Co3O4 were grown on the surface of BiVO4 to obtain BiVO4-MoS2-Co3O4.E-BiVO4-MoS2-Co3O4 film was achieved by further electrochemical treatment of BiVO4-MoS2-Co3O4.The as-prepared E-BiVO4-MoS2-Co3O4 exhibited significantly enhanced photoelectrocatalytic activ-ity.The photocurrent density of E-BiVO4-MoS2-Co3O4 thin film is 6.6 times that of BiVO4 un-der visible light irradiation.The degradation efficiency of E-BiVO4-MoS2-Co3O4 for bisphenol A pollutant was 81.56％in photoelectrochemical process.The pseudo-first order reaction rate constant of E-BiVO4-MoS2-Co3O4 film is 3.22 times higher than that of BiVO4.And its reaction rate constant in photoelectrocatalytic process is 14.5 times or 2 times that in pho-tocatalytic or electrocatalytic process,respectively.The improved performance of E-BiVO4-MoS2-Co3O4 was attributed to the synergetic effects of the reduction of interfacial charge transfer resistance,the formation of oxygen vacancies and sub-stoichiometric metal ox-ides and higher separation efficiency of photogenerated electron-hole pairs.E-BiVO4-MoS2-Co3O4 is a promising composite material for pollutants removal.