Removal of nickel(II) ions during water purification with ferrous sulfate. Part 2. Structure and composition of iron(III) hydroxide precipitates
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Abstract
A comparative analysis of the composition and structure of freshly precipitated iron(III) hydroxide precipitates obtained from a solution of iron(II) sulfate in the presence of sodium sulfate (400 mg L-1) at pH 7 and 8 before and after sorption of nickel ions on them was carried out. Using IR and Raman spectroscopy, X-ray phase and thermogravimetric analysis, it was shown that the precipitates have the general (gross) formula Fe2O3×2H2O and contain a small amount of goethite (α-FeOOH) and lepidocrocite (γ-FeOOH). It has been established that the sorption of nickel ions on these precipitates is not accompanied by chemisorption, i.e. no mixed compounds between iron and nickel are formed. The point of zero charge of precipitation particles is at pH 5.4, with positive zeta potential below and negative above this pH. The introduction of nickel ions into the solution leads to the appearance of a second zero charge point at pH 10.2.
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Funding data
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Russian Foundation for Fundamental Investigations
Grant numbers 20-48-660038 -
Ministry of Science and Higher Education of the Russian Federation
Grant numbers 124020600024-5
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