Title: Use of complexing agents for effective ion-exchange separation of Co(II)/Ni(II) from aqueous solutions
Abstract: Cation-exchange separation of Co2+/Ni2+ from aqueous solutions using water-soluble complexing agents of ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), iminodiacetic acid (IDA), and citrate was experimentally studied at 298 K. Experiments were carried out as a function of initial aqueous pH (1.0–6.0), concentration of total metals (1.5–45.0 mol/m3), the concentration ratio of two metals (0.1–10) and of complexing agent to the total metals (0–1). It was shown that the exchange selectivity strongly depended on solution pH and was not completely related to the affinity of any metal with the complexing agents. When a certain level of complexing agent was present, highly effective separation could be achieved at an appropriate pH range (for an equimolar metal solution, e.g., pH 2–3 with EDTA and NTA as well as pH>3 with IDA and citrate). The application potential of this method was highlighted for the separation of Co2+ from binary mixtures in the presence of trace amount of Ni2+ due to its high selectivity and the smaller amount of the complexing agents needed.
Publication Year: 2003
Publication Date: 2003-01-21
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
Access and Citation
Cited By Count: 28
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot