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研究报告

李霞,崔玥昕,王雁,Abdul khaliq Jan,赵旭.BiVO₄-Cu₂O/CuO双光电极自偏压光电催化降解苯酚研究[J].环境科学学报,2018,38(11):4299-4305

Photoelectrocatalytic degradation of phenol in a self-driven system with BiVO₄-Cu₂O/CuO dual photoelectrode

李霞
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

Abdul khaliq Jan
1. 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;2. Shaheed BB University Sheringal Dir, KPK, Pakistan

摘要：基于费米能级差，构建了以BiVO₄为光阳极，Cu₂O/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H₂O₂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H₂O₂初始浓度、pH对降解的影响，结果表明在H₂O₂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、·O₂^-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.

Abstract：In this work, a self-driven photocatalytic fuel cell (PFC) system was constructed, which consisted of a BiVO₄ photoanode and a Cu₂O/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 min with the addition of 5 mmol·L^-1 H₂O₂ to the PFC system and pH=3.5. Active free radicals involving·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.