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http://dx.doi.org/10.7317/pk.2014.38.5.557

Adsorption Behavior of Sr Ion on Calcium-Alginate-Chitosan  

Lan, Dong (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics)
Bing, Deng (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics)
Lanlan, Ding (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics)
Qiong, Cheng (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics)
Yong, Yang (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics)
Yang, Du (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics)
Publication Information
Polymer(Korea) / v.38, no.5, 2014 , pp. 557-565 More about this Journal
Abstract
Sodium alginate and chitosan are added to a $CaCl_2$ 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 $Sr^{2+}$ 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 $Sr^{2+}$ by calcium alginate and chitosan. By building an interaction model of the molecules of chitosan and alginate with $Ca^{2+}$ and $Sr^{2+}$ to calculate energy parameters, Fukui index, Mulliken charge, and Mulliken population, adsorption of $Sr^{2+}$ 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.
Keywords
Ca-alginate-chitosan; adsorption; $Sr^{2+}$; kinetics; thermodynamics;
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