Equilibrium, kinetic and thermodynamic studies of adsorption of fluoride onto plaster of Paris

被引：116

作者：

Gopal, V.

Elango, K. P. ^{[1
]}

机构：

[1] Deemed Univ, Gandhigram Rural Inst, Dept Chem, Gandhigram 624302, India

[2] Tamil Nadu Water Supply & Drainage Board, Dist Water Testing Lab, Theni 625531, India

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2007年 / 141卷 / 01期

关键词：

adsorption; defluoridation; isotherms; plaster of Paris;

D O I：

10.1016/j.jhazmat.2006.06.099

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Batch sorption system using plaster of Paris as an adsorbent was investigated to remove fluoride ions from aqueous solutions. The system variables studied include initial concentration of the sorbate, agitation time, adsorbent dose, pH, co-ions and temperature. The experimental data fitted well to the Freundlich and Langmuir isotherms. Thermodynamic parameters such as Delta H degrees, Delta S degrees and Delta G degrees were calculated indicating that the adsorption was a spontaneous and exothermic. Kinetic studies reveal that the adsorption is first order. A mechanism involving three stages (external surface adsorption, intraparticle diffusion and final equilibrium) has been proposed for the adsorption of F- onto plaster of Paris. XRD patterns of the adsorbent were recorded to get a better in sight into the mechanism of adsorption process. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：98 / 105

页数：8

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