Enhanced Photoelectrocatalytic Decomplexation of Cu–EDTA and Cu Recovery by Persulfate Activated by UV and Cathodic Reduction

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Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
University of Chinese Academy of Sciences, Beijing 100085, China
*Phone: +86-10-62849667; fax: +86-10-62849667; e-mail: [email protected]
Cite this: Environ. Sci. Technol. 2016, 50, 12, 6459–6466
Publication Date (Web):May 23, 2016
https://doi.org/10.1021/acs.est.6b00632
Copyright © 2016 American Chemical Society
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Abstract

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/cm2 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%.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.6b00632.

  • Additional information about the detection methods of total Cu complexes and S2O82–, procedure of Cu mass balance, proposed degradation pathway of Cu–EDTA, radicals quenching study, effect of NO3, SO42–, Cl and O2 on the PEC/S2O82– process, effect of initial solution pH on the PEC process and PEC/S2O82– process, the variation of S2O82– concentration and Cu2+, characteristics of the cathode at different reaction time and qualities variation of the real electroplating wastewater (PDF)

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