Electro-oxidation of Ni(Ⅱ)-citrate complexes at BDD electrode and simultaneous recovery of metallic nickel by electrodeposition

作     者：Qiongfang Zhuo Xiaofeng Xu Shuibo Xie Xiuwen Ren Zhongying Chen Bo Yang Yanliang Li Junfeng Niu Qiongfang Zhuo;Xiaofeng Xu;Shuibo Xie;Xiuwen Ren;Zhongying Chen;Bo Yang;Yanliang Li;Junfeng Niu

作者机构：School of Civil EngineeringUniversity of South ChinaHengyang 421001China School of Environment and Civil EngineeringDongguan University of TechnologyDongguan 523808China South China Institute of Environmental SciencesMEEGuangzhou 510655China College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518071China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2022年第34卷第6期

页      面：103-113页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：supported by Major Science and Technology Program for Water Pollution Control and Treatment in China(No.2017ZX07202-001-007) the National Science Fund for Distinguished Young Scholars(No.51625801) the Guangdong Innovation Team Project for Colleges and Universities(No.2016KCXTD023) Guangdong Provincial Science and Technology Project(No.2017A020216014) the National Science Fund,China(No.21777106) Pearl River S&T Noval Program of Guangzhou,China(No.201710010065) the key projects of Dongguan social science and technology development plan(No.2019507140204) 

主　　题：Electrochemical oxidation Electrodeposition BDD anode Metal complexes Metallic nickel recovery 

摘      要：The simultaneous electro-oxidation of Ni(Ⅱ)-citrate and electrodeposition recovery of nickel metal were attempted in a combined electro-oxidation-electrodeposition reactor with a boron-doped diamond(BDD)anode and a polished titanium *** of initial nickel citrate concentration,current density,initial p H,electrode spacing,electrolyte type,and initial electrolyte dosage on electrochemical performance were *** efficiencies of Ni(Ⅱ)-citrate removal and nickel metal recovery were determined to be 100%and over 72%,respectively,under the optimized conditions(10 m A/cm^(2),pH 4.09,80 mmol/L Na_(2)SO_(4),initial Ni(Ⅱ)-citrate concentration of 75 mg/L,electrode spacing of 1 cm,and 180 min of electrolysis).Energy consumption increased with increased current density,and the energy consumption was 0.032 kWh/L at a current density of 10 m A/cm^(2)(pH 6.58).The deposits at the cathode were characterized by scanning electron microscopy(SEM),energy-dispersive spectrometry(EDS),X-ray diffraction(XRD),and X-ray photoelectron spectroscopy(XPS).These characterization results indicated that the purity of metallic nickel in cathodic deposition was over 95%.The electrochemical system exhibited a prospective approach to oxidize metal complexes and recover metallic nickel.