Purification of solutions from nickel(II) ions when using iron(II) sulfate as a coagulant
Abstract
The results of studying the possibility of using a coagulant of iron(II) sulfate for cleaning contaminated solutions not only from insoluble coarse and colloidal impurities, but also from the nickel(II) ions present in them are presented. The studies were carried out at room temperature on a model sodium sulfate solution (400 mg/L), simulating polluted natural and waste waters. It was found that the removal of nickel ions from the model solution by the precipitate of iron(III) hydroxide formed in it at pH=8 is described with satisfactory accuracy by the Freundlich isotherm and the Langmuir equation for monomolecular adsorption. The found value of the sorption capacity of iron(III) hydroxide in relation to nickel ions is 833.4 mg/g, which significantly exceeds the similar sorption capacities of many mineral and carbon sorbents. The data obtained make it possible to select the required concentration of the coagulant FeSO4 to achieve a given depth of purification of contaminated solutions from nickel ions.
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