Calcined Mg-Fe-CO3 LDH as an adsorbent for the removal of selenite

被引：78

作者：

Das, J. ^{[1
]}

Patra, B. Sairam ^{[1
]}

Baliarsingh, N. ^{[1
]}

Parida, K. M. ^{[1
]}

机构：

[1] Inst Minerals & Mat Technol, Reg Res Lab, Orissa, India

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2007年 / 316卷 / 02期

关键词：

calcined Mg-Fe-CO3; layered double hydroxide; adsorption; selenite; thermodynamic parameters;

D O I：

10.1016/j.jcis.2007.07.082

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Mg-Fe-CO3 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 SeO32- on CLDHs was studied and the results indicate that the sorption capacity of CLDHs was higher than that of uncalcined LDHs. Isotherms for SeO32- sorption by CLDHs were well described using the Freundlich and Langmuir equations. The thermodynamic parameters, viz. Delta G*, Delta H*, Delta S* were calculated to predict the nature of adsorption. The negative and positive values of Delta G* and Delta H* indicate that the adsorption process is spontaneous and endothermic in nature, respectively. The adsorption process followed first-order kinetics. (C) 2007 Elsevier Inc. All rights reserved.

引用

页码：216 / 223

页数：8

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