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Enhancement of Photoelectrocatalytic Oxidation of Cu-Cyanide Complexes and Cathodic Recovery of Cu in a Metal-Free System
Tian, Shichao; Dang, Congzhe; Mao, Ran; Zhao, Xu
2018-08-01
Source PublicationACS SUSTAINABLE CHEMISTRY & ENGINEERING
ISSN2168-0485
Volume6Issue:8Pages:10273-10281
AbstractIn this work, a photoelectrocatalytic (PEC) system was established for oxidation of Cu-cyanide complexes and copper cathodic recovery. Graphitic carbon nitride (g-C3N4) responsive to visible light and graphitic carbon felt (GCF) modified by polyaniline (PANT) were used as the anode and cathode, respectively. Addition of 1.0 mM peroxydisulfate (PS) to this PEC system efficiently increased the oxidation efficiency of the Cu-cyanide complexes from 15.56% to 81.00% at 1.5 V. In comparison with the individual GCF cathode, the copper recovery efficiency was increased from 30.07% to 58.69% using a GCF/PANI electrode; the copper deposition onto the g-C3N4 photoanode was efficiently inhibited. Thus, the total Cu removal efficiency was determined to be 82.72%. The amine and imine functional groups in PANI were favorable for Cu recovery. Based upon ESR analysis, it was proposed that SO4 center dot- radicals were generated through a Fenton-like reaction. Meanwhile, PS was also activated to generate SO4 center dot- radicals by the deposition of copper oxides onto g-C3N4 photoanode and photogenerated electrons on the cathode. The generated SO4 center dot- radicals were mainly responsible for CN- removal. The established metal-free PEC system achieved the cyanide oxidation and cathodic copper recovery efficiently.
Department中国科学院饮用水科学与技术重点实验室
KeywordGraphitic carbon nitride Graphitic carbon felt Cu-cyanide Peroxydisulfate Photoelectrocatalysis
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/41363
Collection中国科学院饮用水科学与技术重点实验室
Recommended Citation
GB/T 7714
Tian, Shichao,Dang, Congzhe,Mao, Ran,et al. Enhancement of Photoelectrocatalytic Oxidation of Cu-Cyanide Complexes and Cathodic Recovery of Cu in a Metal-Free System[J]. ACS SUSTAINABLE CHEMISTRY & ENGINEERING,2018,6(8):10273-10281.
APA Tian, Shichao,Dang, Congzhe,Mao, Ran,&Zhao, Xu.(2018).Enhancement of Photoelectrocatalytic Oxidation of Cu-Cyanide Complexes and Cathodic Recovery of Cu in a Metal-Free System.ACS SUSTAINABLE CHEMISTRY & ENGINEERING,6(8),10273-10281.
MLA Tian, Shichao,et al."Enhancement of Photoelectrocatalytic Oxidation of Cu-Cyanide Complexes and Cathodic Recovery of Cu in a Metal-Free System".ACS SUSTAINABLE CHEMISTRY & ENGINEERING 6.8(2018):10273-10281.
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