Insight into selective removal of copper from high-concentration nickel solutions with XPS and DFT: New technique to prepare 5N-nickel with chelating resin

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• 作者：Xuewen Tao¹ ; Fuqiang Liu¹ ; ^{jogia@163.com" class="auth_mail" title="E-mail the corresponding author} ; Zhiping Bai² ; ^{baizp@nju.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Dongyang Wei³ ; Xiaopeng Zhang¹ ; Junfei Wang¹ ; Jie Gao¹ ; Xiaowen Sun¹ ; Baohua Li¹ ; Chenghui Li² ; Aimin Li¹
• 关键词：Selective separation ; High-purity nickel ; Amino chelating resin ; Copper ; Density functional theory
• 刊名：Journal of Environmental Sciences
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：48
• 期：Complete
• 页码：34-44
• 全文大小：1584 K

文摘

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 2.286 mmol/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 800 BV (bed volume) effluent in the column dynamic process. According to the cost–benefit analysis, purification contributed to a profit of approximately 60,000 USD per cycle, and the investment return period was less than 1/3 years. 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.