Thermodynamic and kinetic studies of effective adsorption of 2,4,6-trichlorophenol onto calcine Mg/Al-CO₃ layered double hydroxide

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• 作者：Dan Zhang 张丹 ; Guoqing Zhao ; Jingang Yu…
• 关键词：Key words2 ; 4 ; 6 ; trichlorophenol ; calcined Mg/Al ; CO3 layered double hydroxide ; adsorption isotherm ; thermodynamic ; kinetics
• 刊名：Journal of Wuhan University of Technology-Mater. Sci. Ed.
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：31
• 期：6
• 页码：1211-1218
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science, general;
• 出版者：Wuhan University of Technology
• ISSN：1993-0437
• 卷排序：31

文摘

Adsorption of 2, 4, 6-trichlorophenol (TCP) onto the calcined Mg/Al-CO₃ layered double hydroxide (CLDH) was investigated. The prepared Mg/Al-CO₃ layered double hydroxide (LDH) and CLDH were characterized by powder X-ray diffraction (XRD) and thermo gravimetric analyzer-differential scanning calorimeters (TG-DSC). Moreover, 2,4,6-trichlorophenol (TCP) was removed effectively (94.7% of removal percentage in 9 h) under the optimized experimental conditions. The adsorption kinetics data fitted the pseudo-second-order model well. The Freundlich, Langmuir, and Tempkin adsorption models were applied to the experimental equilibrium adsorption data at different temperatures of solution. The adsorption data fitted the Freundlieh adsorption isotherm with good values of the correlation coefficient. A mechanism of the adsorption process is proposed according to the intraparticle diffusion model, which indicates that the overall rate of adsorption can be described as three steps.