Jiang Tao, Guan Wei, Fu Min
Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing, China.
Chongqing Key Laboratory of Environmental Materials and Remediation Technologies, Chongqing University of Arts and Sciences, Chongqing, China.
Water Environ Res. 2022 Jun;94(6):e10741. doi: 10.1002/wer.10741.
Nickel exists primarily as a stable complex in electroless nickel plating wastewater, and the Ni recovery from it cannot be achieved solely through electrodeposition. As the electrocatalytic oxidation has excellent oxidation potential to break down the complex, an efficient and stable electrochemical system using the synergy of electrocatalytic oxidation and electrochemical deposition technology was developed for the recovery of nickel from electroless nickel plating wastewater. In the present study, the effects of initial pH, current density, and initial nickel ion concentration on the treatment performance of the electrochemical system was investigated. The highest Ni recovery (94.84%) and total organic carbon removal (63.94%) were achieved at a current density of 83.3 mA/cm , initial pH of 3.0, and initial Ni concentration of 0.01 M. At the same time, the recovered nickel product was confirmed by scanning electron microscopy, energy dispersive X-ray, X-ray powder diffraction, and X-ray photoelectron spectroscopy. Furthermore, the electrochemical system displayed good stability and economic benefits, thereby suggesting its excellent application potential for the treatment of electroless nickel plating wastewater. PRACTITIONER POINTS: An efficient and stable electrochemical system was developed for the recovery of nickel from electroless nickel plating wastewater. In an acidic medium, the nickel recovery rate and TOC removal ratio were 94.84% and 63.94%, respectively. The system displayed good stability, thereby suggesting its excellent application potential for the treatment of nickel plating wastewater.
镍在化学镀镍废水中主要以稳定的络合物形式存在，仅通过电沉积无法实现从其中回收镍。由于电催化氧化具有优异的氧化电位来分解该络合物，因此开发了一种利用电催化氧化和电化学沉积技术协同作用的高效稳定电化学系统，用于从化学镀镍废水中回收镍。在本研究中，考察了初始pH值、电流密度和初始镍离子浓度对电化学系统处理性能的影响。在电流密度为83.3 mA/cm²、初始pH值为3.0、初始镍浓度为0.01 M时，实现了最高的镍回收率（94.84%）和总有机碳去除率（63.94%）。同时，通过扫描电子显微镜、能量色散X射线、X射线粉末衍射和X射线光电子能谱对回收的镍产物进行了表征。此外，该电化学系统表现出良好的稳定性和经济效益，从而表明其在处理化学镀镍废水方面具有优异的应用潜力。从业者要点：开发了一种高效稳定的电化学系统用于从化学镀镍废水中回收镍。在酸性介质中，镍回收率和TOC去除率分别为94.84%和63.94%。该系统表现出良好的稳定性，从而表明其在处理镀镍废水方面具有优异的应用潜力。
