Photoelectrochemical sewage treatment by sulfite activation over an optimized BiVO4 photoanode to simultaneously promote PPCPs degradation, H2 evolution and E. coli disinfection

降级(电信) 亚硫酸盐 污水 污水处理 化学工程 化学 废物管理 环境化学 材料科学 环境科学 制浆造纸工业 环境工程 无机化学 计算机科学 电信 工程类
作者
Zexiao Zheng,Jijun He,Chencheng Dong,Irene M.C. Lo
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:419: 129418-129418 被引量:35
标识
DOI:10.1016/j.cej.2021.129418
摘要

• The photoelectrochemical performance of BiVO 4 photoanode was significantly improved by controlling morphology. • The PEC activation of sulfite simultaneously promoted PPCPs degradation, H 2 evolution, and E. coli disinfection. • SO 4 − contributed the most to BZP degradation. A new photoelectrochemical (PEC) system by means of adding sodium sulfite (Na 2 SO 3 ) was developed to treat sewage. The PEC system simultaneously promoted pharmaceuticals and personal care products (PPCPs) degradation, H 2 evolution and E. coli disinfection using an optimized, visible–light driven BiVO 4 photoanode. The PEC reactions were first carried out in 1.5 mM Na 2 SO 3 electrolyte. 92.3% of 2 ppm benzophenone-3 (BZP) was degraded, and 115.36 μmol of H 2 was produced in 90 min at 1.0 V vs. Ag/AgCl, which was a significant improvement over cases where the electrolyte was either Na 2 SO 4 or NaCl. The sulfite ions were first activated by holes and then converted into sulfate radicals, which played a dominant role in the degradation of BZP. As the holes were caught by the sulfite, charge separation was also enhanced, increasing H 2 evolution. The PEC reactions were also used to treat real sewage, in which case an 82% improvement in the rate constant of BZP degradation, 60% increase of H 2 evolution, and 0.78 log enhancement of E. coli disinfection were achieved by adding 1.5 mM Na 2 SO 3. The system was also feasible to degrade various PPCPs, and showed excellent reusability and stability, proving its great potential in sewage treatment.
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