Equilibrium studies for trimethoprim adsorption on montmorillonite KSF

被引：112

作者：

Bekci, Zehra ^{[1
]}

Seki, Yoldas ^{[1
]}

Yurdakoc, M. Kadir ^{[1
]}

机构：

[1] Dokuz Eylul Univ, Dept Chem, Fac Arts & Sci, TR-35160 Izmir, Turkey

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2006年 / 133卷 / 1-3期

关键词：

trimetophrim; adsorption; montmorillonite; adsorption kinetics; FT-IR;

D O I：

10.1016/j.jhazmat.2005.10.029

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this study. the adsorption of trimethoprim (TMP) on montmorillonite KSF was studied under different conditions (pH, ionic strength, temperature). The results indicate that a pH value of 5.04 is optimum value for the adsorption of TMP on KSF. The adsorption kinetics was interpreted using pseudo-first-order kinetic model, pseudo-second-order kinetic model and intraparticle diffusion model. The pseudo-second-order model provides the best correlation with the experimental data of KSF adsorption. The adsorption data could be fitted with Freundlich, Langmuir and Dubinin-Radushkevich equation to find the characteristic parameters of each model. It was found that linear form of Langmuir isotherm seems to produce a better model than linear form of Freundlich equation. From the Langmuir and Freundlich equation, the adsorption capacity values raised as the solution temperature decreased. From DR isotherm, it was also determined that the type of adsorption can be considered as ion-exchange mechanism. Determination of the thermodynamic parameters Delta H-0, Delta S-0 and Delta G(0) showed that adsorption was spontaneous and exothermic in nature. It was also added that adsorption of TMP by KSF may involve physical adsorption. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：233 / 242

页数：10

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