Adsorption Behavior of Sr Ion on Calcium-Alginate-Chitosan

作者：Dong Lan^*; Deng Bing; Ding Lanlan; Cheng Qiong; Yang Yong; Du Yang

来源：Polymer-Korea, 2014, 38(5): 557-565.

DOI：10.7317/pk.2014.38.5.557

• Ca-alginate-chitosan
• adsorption
• Sr2+
• kinetics
• thermodynamics

Sodium alginate and chitosan are added to a CaCl2 solution to prepare calcium-alginate-chitosan and calcium-alginate gels. After dehydration through stoving, two types of adsorbent particles are obtained. The adsorption process of the particles obtained for low concentrations of Sr2+ satisfies a second-order kinetic equation and the Freundlich adsorption model. The thermodynamic behaviors of the particles indicate that adsorption occurs via a spontaneous physical process. XPS pattern analysis is used to demonstrate the adsorption of Sr2+ by calcium alginate and chitosan. By building an interaction model of the molecules of chitosan and alginate with Ca2+ and Sr2+ to calculate energy parameters, Fukui index, Mulliken charge, and Mulliken population, adsorption of Sr2+ on the molecular chains of chitosan as well as the boundary of calcium-alginate chitosan is observed to show weak stability; by contrast, adsorption between molecular chains is high.

• 出版日期2014-9
• 单位中国工程物理研究院; 中国工程物理研究院核物理与化学研究所