BiVO4-Cu2O/CuO双光电极自偏压光电催化降解苯酚研究  

Photoelectrocatalytic degradation of phenol in a self-driven system with BiVO_4-Cu_2O/CuO dual photoelectrode

作　　者：李霞 崔玥昕 王雁[2] Abdul khaliq Jan 赵旭[2,3] LI Xia;CUI Yuexin;WANG Yan;Abdul khaliq Jan;ZHAO Xu(Beijing Capital Co.Ltd.,Beijing 100028;State Key Laboratory of Environmental Aquatie Chemistry,Research Center for Eeo-Environmental Seienees,Chinese Academy of Sciences Beijing 100085;University of Chinese Academy of Sciences,Beijing 100049;Shaheed BB University Sheringal Dir,KPK,Pakistan)

机构地区：[1]北京首创股份有限公司,北京100028 [2]中国科学院生态环境研究中心环境水质学国家重点实验室,北京100085 [3]中国科学院大学,北京100049 [4]Shaheed BB University Sheringal Dir, KPK, Pakistan

出　　处：《环境科学学报》2018年第11期4299-4305,共7页Acta Scientiae Circumstantiae

基　　金：水体污染控制与治理科技重大专项(No.2017ZX07102-003); 国家自然科学基金(No.21377148,51708544)

摘　　要：基于费米能级差,构建了以BiVO_4为光阳极,Cu_2O/CuO为光阴极的双光电极可见光响应光催化燃料电池体系,研究了该体系在不同氧化剂的辅助作用下光电催化降解苯酚的效率与动力学.结果表明,向该体系中投加H_2O_2可以显著促进苯酚的降解,且反应过程光电流稳定,铜溶出量低.详细探究了H_2O_2初始浓度、pH对降解的影响,结果表明在H_2O_2投加量为5 mmol·L^(-1),初始pH为3.5条件下利于苯酚降解,5 mg·L^(-1)的苯酚可在120 min内完全去除.顺磁共振和猝灭实验表明该体系的主要氧化物种为·OH、·O^-_2和光生空穴.该催化体系实现了苯酚在可见光下的高效催化降解.In this work, a self-driven photocatalytic fuel cell （PFC） system was constructed, which consisted of a BiVO4 photoanode and a Cu20/CuO photocathode. The proposed PFC system was used for the degradation of phenol with the addition of oxidizing agents, which which could significantly enhance the degradation of phenol. The effect of initial concentration of H2O2 and initial pH on the removal of phenol was studied. The phenol can be completely removed in 120 rain with the addition of 5 mmol· L-1 H2O2 to the PFC system and pH = 3.5. Active free radicals involving ·2 OH, · O2^- and h^＋ were produced in this process, which were confirmed by electron spin resonance analysis and quenching experiment. The results showed that the H2O2- PFC system greatly enhanced the phenol degradation process.

关 键 词：自偏压 光电催化氧化 过氧化氢 有机污染物 

分 类 号：X703[环境科学与工程—环境工程]