Chemical Precipitation of Nickel Species from Waste Water
G. Ramiro Escudero, E. Eunice Espinoza, Feng Rao
International Research Journal of Pure and Applied Chemistry · pp. 1–7 · Published 7 Dec 2017
10.9734/IRJPAC/2017/37905Abstract
In liquid-liquid and solid-liquid systems, it is possible to promote chemical precipitation of certain species by controlling the physicochemical conditions of the liquid media. In the case of solid-liquid interactions the chemical precipitates can absorb on the surface of particles modifying their surface properties (i.e. during milling), whereas for liquid-liquid system precipitation contributes to the removal (cleaning) of contaminated water (wastewater). In this work nickel sulfate hexahydrate (NiSO4 ∙ 6H2O) was dissolved in distilled water, to establish the physicochemical conditions (pH, electrochemical potential, ionic strength, activity coefficient) that enhance the chemical precipitation of nickel species. The experimental results show that nickel precipitates as nickel hydroxide (Ni(OH)2) starting at pH 3, being more evident at pH 9. Nickel precipitates completely at pH 11. From these results, it is possible to propose a decontamination mechanism for wastewater containing nickel.
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