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Published on: February 21, 2017
Calcined Mg-Fe-CO(3) LDH as an adsorbent for the removal of selenite
J Das1, B Sairam Patra, N Baliarsingh
1Institute of Minerals and Materials Technology (IMMT) (Formerly Regional Research Laboratory), Bhubaneswar 751 013, Orissa, India.
Abstract:
Mg-Fe-CO(3) layered double hydroxide (LDH) with a Mg/Fe molar ratio of 2.0 was synthesized by co-precipitation method and its calcined product (CLDH) was obtained by heating Mg/Fe-LDH at 500 degrees C. Sorption of SeO(2-)(3) on CLDHs was studied and the results indicate that the sorption capacity of CLDHs was higher than that of uncalcined LDHs. Isotherms for SeO(2-)(3) sorption by CLDHs were well described using the Freundlich and Langmuir equations. The thermodynamic parameters, viz. DeltaG*, DeltaH*, DeltaS* were calculated to predict the nature of adsorption. The negative and positive values of DeltaG* and DeltaH* indicate that the adsorption process is spontaneous and endothermic in nature, respectively. The adsorption process followed first-order kinetics.
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