Calcined Mg-Fe-CO(3) LDH as an adsorbent for the removal of selenite |
| |
Authors: | Das J Sairam Patra B Baliarsingh N Parida K M |
| |
Affiliation: | Institute 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. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|