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Photoelectrocatalytic Oxidation of Cu-II-EDTA at the TiO2 Electrode and Simultaneous Recovery of Cu-II by Electrodeposition
Zhao, Xu; Guo, Libao; Zhang, Baofeng; Liu, Huijuan; Qu, Jiuhui; Liu, HJ
2013
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume47Issue:9Pages:4480-4488
AbstractThe simultaneous decomplexation of Cu-EDTA and electrocleposition recovery of Cu2+ ions was attempted in a photoelectrocatalytic (PEC) system using TiO2/Ti as the anode and stainless steel as the cathode. At a current density of 0.5 mA/cm(2), removal efficiencies of 0.05 mM Cu-EDTA by photocatalysis, electrooxidation, and PEC processes were determined to be 15, 43, and 72% at 3 h, respectively. Recovery percentages of Cu2+ ions were determined to be 10, 33, and 67%, respectively. These results indicated that a synergetic effect in the decomplexation of Cu-EDTA and recovery of Cu2+ ions occurred in the PEC process, which favored acid conditions and increased with the current densities. The removal of Cu-EDTA and Cu2+ ions can be described by a pseudo-first-order kinetics model. Ca2+ ions significantly increase the removal of Cu-EDTA and recovery of Cu2+ ions. Intermediates, including Cu-NTA, Cu-EDDA, acetic acid, formic acid, and oxalic acid, were identified, and a decomplexation pathway of Cu-EDTA was proposed. The Cu-EDTA decomplexation at the anode via oxidation of hydroxyl radicals was revealed. On the basis of X-ray photoelectron spectra analysis, a reduction pathway of Cu2+ ions at the cathode was discussed. The present study may provide a promising alternative for destruction of the metal complex and recovery of metal ions.
Department环境水质学国家重点实验室
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Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/7426
Collection环境水质学国家重点实验室
Corresponding AuthorLiu, HJ
Recommended Citation
GB/T 7714
Zhao, Xu,Guo, Libao,Zhang, Baofeng,et al. Photoelectrocatalytic Oxidation of Cu-II-EDTA at the TiO2 Electrode and Simultaneous Recovery of Cu-II by Electrodeposition[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2013,47(9):4480-4488.
APA Zhao, Xu,Guo, Libao,Zhang, Baofeng,Liu, Huijuan,Qu, Jiuhui,&Liu, HJ.(2013).Photoelectrocatalytic Oxidation of Cu-II-EDTA at the TiO2 Electrode and Simultaneous Recovery of Cu-II by Electrodeposition.ENVIRONMENTAL SCIENCE & TECHNOLOGY,47(9),4480-4488.
MLA Zhao, Xu,et al."Photoelectrocatalytic Oxidation of Cu-II-EDTA at the TiO2 Electrode and Simultaneous Recovery of Cu-II by Electrodeposition".ENVIRONMENTAL SCIENCE & TECHNOLOGY 47.9(2013):4480-4488.
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