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

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 qua...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2016-10, Vol.48 (10), p.34-44
Main Authors: Tao, Xuewen, Liu, Fuqiang, Bai, Zhiping, Wei, Dongyang, Zhang, Xiaopeng, Wang, Junfei, Gao, Jie, Sun, Xiaowen, Li, Baohua, Li, Chenghui, Li, Aimin
Format: Article
Language:English
Subjects:
Amino chelating resin
Chelating Agents - chemistry
Chemical Fractionation - methods
Copper
Copper - chemistry
Cost-Benefit Analysis
Density functional theory
High-purity nickel
Models, Chemical
Nickel - chemistry
Selective separation
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Summary: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.
ISSN:1001-0742
1878-7320
DOI:10.1016/j.jes.2015.10.034