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DOI: https://doi.org/10.4491/eer.2018.229
Fabrication of Ti/Ir-Ru electrode by spin coating method for electrochemical removal of copper
Joohyun Kim, and Sungjun Bae
Department of Civil and Environmental Engineering, Konkuk University, Seoul 05029, Republic of Korea
Corresponding Author: Sungjun Bae ,Tel: 82-42-450-3904, Email: bsj1003@konkuk.ac.kr
Received: July 10, 2018;  Accepted: December 31, 2018.
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ABSTRACT
Recovery of valuable metals in the industrial wastewater and sludge has attracted an attention owing to limited metallic resources in the earth. In this study, we firstly fabricated Ti/Ir-Ru electrodes by spin coating technique for effective recovery of Cu in electrowinning process. Two different Ti/Ir-Ru electrodes were fabricated using 100 and 500 mM of precursors (i.e., Ir-Ru). SEM-EDX and AFM revealed that Ir and Ru were homogenously distributed on the surface of Ti plate by the spin coating, in particular the electrode prepared by 500 mM showed distinct boundary line between Ir-Ru layer and Ti substrate. XRD, XPS, and cyclic voltammetry also revealed that characteristics of IrO2, RuO2, and TiO2 and its electrocatalytic property increased as the concentration of coating precursor increased. Finally, we carried out Cu recovery experiments using two Ti/Ir-Ru as anodes in electrowinning process, showing that both anodes showed a complete removal of Cu (1 and 10 g/L) within 6 h reaction, but much higher kinetic rate constant was obtained by the anode prepared by 500 mM. The findings in this study can provide a fundamental knowledge for surface characteristics of Ti/Ir-Ru electrode prepared by spin coating method and its potential feasibility for effective electrowinning process.
Keywords: Cu removal | Electrowinning | Spin coating | Surface characterization | Ti/Ir-Ru anode
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