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Insight into selective removal of copper from high-concentration nickel solutions with XPS and DFT: New technique to prepare 5N-nickel with chelating resin
- Tao, Xuewen, Liu, Fuqiang, Bai, Zhiping, Wei, Dongyang, Zhang, Xiaopeng, Wang, Junfei, Gao, Jie, Sun, Xiaowen, Li, Baohua, Li, Chenghui, Li, Aimin
- Journal of environmental sciences (China) 2016 v.48 pp. 34-44
- X-radiation, X-ray photoelectron spectroscopy, active sites, adsorption, coordination compounds, copper, cost benefit analysis, metal ions, nickel, nitrogen, sorption isotherms
- An efficient and profitable separation process was proposed to prepare 5N (the purity of the metal solution reaches 99.999%) high-purity nickel from 3N nickel-solutions using Purolite S984. The adsorption performance of this superior resin, especially its selectivity for metal ions, was explored quantitatively. The maximum adsorption capacity for copper was 2.286mmol/g calculated by the Langmuir model, which was twice as large as that for nickel. In the binary systems, the adsorption capacity for nickel was decreased by 45%, indicating direct competition for the active sites. The infinite separation factor for copper versus nickel exceeded 300, revealing the feasibility of preparing 5N-level high-purity nickel solutions, which was further verified using the 800BV (bed volume) effluent in the column dynamic process. According to the cost–benefit analysis, purification contributed to a profit of approximately 60,000USD per cycle, and the investment return period was less than 1/3years. Density functional theory analysis confirmed that four nitrogen atoms would be involved in the coordination complex and thus a structure involving two five-membered rings could be achieved. The X-ray photoelectron spectra confirmed the involvement of nitrogen atoms, implying a coordination ratio of approximately 1:1.