Adsorption of cesium from aqueous solution using agricultural residue - Walnut shell: Equilibrium, kinetic and thermodynamic modeling studies

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• 作者：Dahu Ding ; Yingxin Zhao ; Shengjiong Yang ; Wansheng Shi ; Zhenya Zhang ; Zhongfang Lei ; Yingnan Yang ; ^{yo.innan.fu@u.tsukuba.ac.jp}
• 关键词：Walnut shell ; Nickel hexacyanoferrate (NiHCF) ; Cesium adsorption ; Integrated analysis
• 刊名：Water Research
• 出版年：2013
• 出版时间：1 May, 2013
• 年：2013
• 卷：47
• 期：7
• 页码：2563-2571
• 全文大小：1029 K

文摘

A novel biosorbent derived from agricultural residue - walnut shell (WS) is reported to remove cesium from aqueous solution. Nickel hexacyanoferrate (NiHCF) was incorporated into this biosorbent, serving as a high selectivity trap agent for cesium. Field emission scanning electron microscope (FE-SEM) and thermogravimetric and differential thermal analysis (TG-DTA) were utilized for the evaluation of the developed biosorbent. Determination of kinetic parameters for adsorption was carried out using pseudo first-order, pseudo second-order kinetic models and intra-particle diffusion models. Adsorption equilibrium was examined using Langmuir, Freundlich and Dubinin-Radushkevich adsorption isotherms. A satisfactory correlation coefficient and relatively low chi-square analysis parameter ¦Ö² between the experimental and predicted values of the Freundlich isotherm demonstrate that cesium adsorption by NiHCF-WS is a multilayer chemical adsorption. Thermodynamic studies were conducted under different reaction temperatures and results indicate that cesium adsorption by NiHCF-WS is an endothermic (¦¤H¡ã?>?0) and spontaneous (¦¤G¡ã?<?0) process.