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α-Fe 2 O 3  coated hydroxy magnesium silicate (HMS) was prepared by the coprecipitation method and was used for the sorption of Cr(VI) from the aquatic environment. FT-IR, XRD, and SEM characterised the investigated composite. The influence of pH, shaking time, Cr(VI) concentration,and the temperature was investigated. The results obtained are fitted well with the pseudo-second-order kinetic model. Besides, Freundlich isotherm is adequate than the Langmuir isotherm. The adsorption was observed to be exothermic, spontaneous, and accompanied by increasing the system’s randomness. The adsorption of chromium attained equilibrium after 60.0 min. The maximum adsorption capacities of α-Fe 2 O 3 /HMS composite for Cr(VI) were 10.75 mg/g obtained at a pH of 2.

Adsorption of Cr(VI) using α-Fe 2 O 3 coated hydroxy magnesium silicate (HMS): isotherm, thermodynamic and kinetic study