Adsorption of Cr(VI) onto crosslinked chitosan microbeads: new kinetic and thermodynamic correlations using continuous isothermal microcalorimetry

Quimica nova

Silva, Rivaldo Cardoso¹  Cestari, Antonio Reinaldo¹  Andrade Jr, Marcos Antonio S.¹ 

[1] Universidade Federal de Sergipe, São Cristóvão, Brasil

关键词: chitosan;    Cr(VI) adsorption;    microcalorimetry.;   

DOI  :  10.1590/S0100-40422010000400022

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

The synthesis andcharacterization of crosslinked chitosan microbeads and their application inthe removal of Cr(VI) are described. New kinetic and thermodynamic parametersof Cr(VI) adsorptions processes were found using continuous isothermal calorimetry.All adsorption processes are exothermic in nature. However, a multivariate statisticalanalysis have pointed out that adsorption enthalpies were affected by importantbinary interactions of the initial Cr(VI) in solution and temperature. The adsorptionenergetic data were well fitted to a kinetic exponential model, which have indicatedfractionary adsorption kinetic orders.

【 授权许可】

CC BY