College of Chemistry and Chemical Engineering;
Hunan University;
Changsha 410082;
China;
Research Institute of New Building Materials;
Hunan Institute of Technology;
Hengyang 421008;
China;
Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province;
College of Chemistry and Chemical Engineering;
China West Normal University;
Nanchong 637002;
China;
Hunan Zihong Ecology Technology Co.;
Ltd.;
Changsha 410000;
China;
Electrocoagulation; Nickel wastewater; Iron configurations; Alternating current; Polynuclear iron-hydroxyl complex;