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Sodium alginate and chitosan are added to a solution to prepare calcium-alginate-chitosan and calciumalginate gels. After dehydration through stoving, two types of adsorbent particles are obtained. The adsorption process of the particles obtained for low concentrations of 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 by calcium alginate and chitosan. By building an interaction model of the molecules of chitosan and alginate with and to calculate energy parameters, Fukui index, Mulliken charge, and Mulliken population, adsorption of 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.

Adsorption Behavior of Sr Ion on Calcium-Alginate-Chitosan