Thermodynamics of Organic Dyes Adsorption onto Thermal Modified Rectorite

被引：0
|
作者：
Song Jingyan [1 ]
He Lingrong [1 ]
机构：
[1] Sichuan Univ Sci & Engn, Inst Architechture & Engn, Zigong 643000, Peoples R China
来源：
ADVANCED MATERIALS RESEARCH II, PTS 1 AND 2 | 2012年 / 463-464卷
关键词：
Thermal modification; Rectorite; Adsorption; Methylene blue; Thermodynamics; AQUEOUS-SOLUTION;
D O I：
10.4028/www.scientific.net/AMR.463-464.194
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Adsorption behavior of Rhodamine B (RhB) onto thermal modified rectorite (TM-R) has been thermodynamically investigated. The thermal modified rectorite prepared at different temperatures was characterized by X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET). The analysis of the isotherm equilibrium data using the Langmuir and Freundlich equations by linear methods showed that the data fitted better with Freundlich model than the Langmuir model. Thermodynamic parameters were calculated based on Van't Hoff equation. The average change of standard adsorption heat of RhB was 88.96 kJ/mol. The adsorption Gibbs free energy changes are in the range of -26.88 similar to-34.52 kJ/mol, The negative of adsorption Gibbs free energy changes in all cases are indicative of the spontaneous nature of the adsorption interaction, and the values of adsorption entropy changes are positive.
引用
收藏
页码：194 / 197
页数：4
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