Electrochemical reduction of nickel ions from dilute solutions

Electrochemical reduction of nickel ions in dilute solution using a divided GBC-cell is of interest for purification of waste waters. A typical solution to be treated is the effluent from steel etching processes which contain low quantities of nickel, chromate and chromium ions. Reduction of chromat...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied electrochemistry 1995-10, Vol.25 (10), p.982-986
Main Authors: NJAU, K. N, JANSSEN, L. J. J
Format: Article
Language:English
Subjects:
Chemistry
Effluents
Electrochemistry
Electrodeposition
Exact sciences and technology
General and physical chemistry
Ions
Nickel
Purification
Q1
Reduction
Study of interfaces
Wastewater treatment
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Electrochemical reduction of nickel ions in dilute solution using a divided GBC-cell is of interest for purification of waste waters. A typical solution to be treated is the effluent from steel etching processes which contain low quantities of nickel, chromate and chromium ions. Reduction of chromate in a divided GBC-cell results in effluent containing Cr super(3+) ions. This paper examines the limitations to further treatment of the effluent by electrochemical reduction of nickel ions. Nickel current efficiency has been determined by varying temperature, pH, current density and concentration of supporting electrolyte. It was found that the presence of a complexing agent, e.g. NH super(+) sub(4) is necessary. To deposit nickel, complete removal of Cr super(3+) ions from the solution is inevitable. Optimum nickel current efficiencies are obtained at pH 5 and current density 10 mA cm super(-2).
ISSN:0021-891X
1572-8838
DOI:10.1007/bf00241595