期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 47, 期 9, 页码 4480-4488出版社
AMER CHEMICAL SOC
DOI: 10.1021/es3046982
关键词
-
资金
- National Natural Science Foundation of China [51222802, 51221892, 51225805]
The 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.
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