oa South African Journal of Chemical Engineering - The removal of Ni & Cu from a mixed metal system using sodium borohydride as a reducing agent
Removal of nickel (II) and copper (II) from aqueous solutions using NaBH4 as a reducing agent was studied. Reduction crystallization was achieved in a batch reactor at 65°C using seeded experiments. The effect of using different molar ratios of [Ni2+] : [BH4 -] namely; 1:1, 1:0.25 and 1:0.1 and seeding materials on the rate of reduction was also investigated. The results obtained showed that NaBH4 is an effective reducing agent for the removal of Ni2+ and Cu2+ from effluents. Using a molar ratio of 1:0.1 of [Ni2+]: [BH4 -] and Fe and Ni as a seeding material over 99% metal removal was achieved. Ni as a seeding material yielded the best results as it is autocatalytic although there was no significant difference in the rate of reduction compared to that obtained when Fe was used as a seeding material.
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