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Thread 324/99
Zn and Ni codeposition from wastewater
Q. Hello,
I am working on simultaneous removal of Zn & Ni ions from wastewater by an electrochemical method. The concentration of both metals are 20 ppm. When I worked in low current density the max. removal of Ni and Zn ions was 30 & 70%. By increasing the current, the Zn ions removal increased but Ni ions removal decreased significantly. How can I get the high removal of both metal ions?
Regards,
Mitra Saidiryerson university - Toronto, Ontario, Canada
2004
publicly reply to Mitra Saidi
A. The answer to your question is obviously contained in your question. Don't use a constant current density in your process.
Marcus Hahn- Lucerne, Switzerland
2004
publicly reply to Marcus Hahn
A. A similar co-reduction requires addition of some manganese salts and varying the potential. Probably you may have to fix the potential near the 'Mn' reduction potential. Zn and Ni will co-deposit in a stoichiometric ratio. Try with KMnO4 addition and if you find anything interesting please inform me. As I am a theoretician I could not do experiment here and confirm.
Chandramohan Rathinam
SSA college - Devakottai, Tamil Nadu, India
2004
publicly reply to Chandramohan Rathinam
A. Have you tried to raise the pH, or used high surface area electrodes? Ni is usually removed well at initial pH~4.2,
Nael YASRIUniversity of Wisconsin - Fitchburg, Wisconsin, USA
May 5, 2014
publicly reply to Nael YASRI
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