Synthesis and Application of Eco-Friendlyred Onion Skins Azo Dyes for the Removal of Cobalt from Aqueous Media

Gervais Manizabayo, Aimable Niyomugabo and Dr. Uche John Chukwu
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Gervais Manizabayo: Chemistry Department, College of Science and Technology, University of Rwanda, Rwanda
Aimable Niyomugabo: Chemical Engineering Department, African Center of Excellence for Sustainable Mining, Copperbelt University, Zambia
Dr. Uche John Chukwu: Pure and Industrial Chemistry Department, University of Port Harcourt, Nigeria

International Journal of Research and Innovation in Applied Science, 2021, vol. 6, issue 7, 43-46

Abstract: The present study investigated the synthesis of low cost and environmental friendly red onion skins azo dyes derivatives and their application as ligands for the extraction of cobalt (II) ions from aqueous media. The effect of pH, agitation time, ligand concentration, and metal ion concentration on Co2+ ions removal efficiency as well as the stoichiometric coefficients were examined. The study revealed that the azo dyes were effective in removing Co2+ ion from aqueous solution. The highest removal efficiencies were obtained within the pH ranges 6-7. The results also showed that the % extraction (% E) of Co2+ions increased with agitation time and concentration of the ligand. The slope analysis carried out on the experimental data demonstrated that Co2+ions reacted with the ligands in 1:2 metals to ligand ratio.

Date: 2021
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