Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 48, Issue -, Pages 34-44Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2015.10.034
Keywords
Selective separation; High-purity nickel; Amino chelating resin; Copper; Density functional theory
Categories
Funding
- National Natural Science Foundation of China [51378253, 51522805]
- Discipline Crossing Foundation of Nanjing University
- National Natural Science Foundation of China [51378253, 51522805]
- Discipline Crossing Foundation of Nanjing University
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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. (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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