Adsorption kinetics, thermodynamics and isotherm of Hg(II) from aqueous solutions using buckwheat hulls from Jiaodong of China

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• 作者：Zengdi Wang ; Ping Yin ; ^{yinping426@163.com} ; Rongjun Qu ; ^{rongjunqu@sohu.com} ; Hou Chen ; Chunhua Wang ; Shuhua Ren
• 关键词：Buckwheat hulls ; Mercury adsorption ; Kinetics ; Thermodynamics ; Isotherm
• 刊名：Food Chemistry
• 出版年：2013
• 出版时间：15 February, 2013
• 年：2013
• 卷：136
• 期：3-4
• 页码：1508-1514
• 全文大小：442 K

文摘

The adsorption kinetics and adsorption isotherms of buckwheat hulls in the region of Jiaodong, China (BHJC) for Hg(II) were investigated. Results revealed that the adsorption kinetics of BHJC for Hg(II) were well described by a pseudo second-order reaction model, and the adsorption thermodynamic parameters ¦¤G, ¦¤H and ¦¤S were -5.83 kJ mol^?1(35 ¡ãC), 73.1, and 256 J K^?1 mol^?1, respectively. Moreover, Langmuir, Freundlich and Redlich-Peterson isotherm models were applied to analyse the experimental data and to predict the relevant isotherm parameters. The best interpretation for the experimental data was given by the Langmuir isotherm equation, and the maximum adsorption capacity for Hg(II) is 243.90 mg/g at 35 ¡ãC. Furthermore, investigation of the adsorption selectivity showed that BHJC displayed strong affinity for mercury in the aqueous solutions and exhibited 100 % selectivity for mercury in the presence of Zn(II) and Cd(II).