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题名: Enhanced Photoelectrocatalytic Decomplexation of Cu-EDTA and Cu Recovery by Persulfate Activated by UV and Cathodic Reduction
作者: Zeng, Huabin; Liu, Shanshan; Chai, Buyu; Cao, Di; Wang, Yan; Zhao, Xu
刊名: ENVIRONMENTAL SCIENCE & TECHNOLOGY
出版日期: 2016-06-21
卷号: 50, 期号:12, 页码:6459-6466
DOI: 10.1021/acs.est.6b00632
部门归属: 中国科学院饮用水科学与技术重点实验室
英文摘要: In order to enhance Cu-EDTA decomplexation and copper cathodic recovery via the photoelectrocatalytic (PEC) process, S2O82- was introduced into the PEC system with a TiO2/Ti photoanode. At a current density of 0.2 mA/cm(2) and initial solution pH of 3.0, the decomplexation ratio of Cu complexes was increased from 47.5% in the PEC process to 98.4% with 5 mM S2O82- addition into the PEC process (PEC/S2O82-). Correspondently, recovery percentage of Cu was increased to 98.3% from 47.4% within 60 min. It was observed that nearly no copper recovery occurred within the initial reaction period of 10 min. Combined with the analysis of ESR and electrochemical LSV curves, it was concluded that activation of S2O82- into SO4- radicals by cathodic reduction occurred, which was prior to the reduction of liberated Cu2+ ions. UV irradiation of S2O82- also led to the production of SO4-. The generated SO4- radicals enhanced the oxidation of Cu-EDTA. After the consumption of S2O82-, the Cu recovery via cathodic reduction proceeded quickly. Acidification induced by the transformation of SO4- to OH. favored the copper cathodic recovery. The combined PEC/S2O82- process was also efficient for the TOC removal from a real electroplating wastewater with the Cu recovery efficiency higher than 80%.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36180
Appears in Collections:中国科学院饮用水科学与技术重点实验室_期刊论文

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