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Adsorption Properties of Oxidized Carboxymethyl Starch and Cross-linked Carboxymethyl Starch for Calcium Ion by Yan-Xiao Chen; Gong-Ying Wang is a Materials Science article available to read on EtoBox.

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The adsorption properties of oxidized carboxymethyl starch (OCMS) and cross-linked carboxymethyl starch (CCMS) with carboxymethyl groups for calcium ion in aqueous solution were investigated. Removal efficiency of calcium ion from aqueous solution was found to be dependent on initial concentration of calcium ion, the adsorbent dose and temperature. Ionization of carboxymethyl groups in OCMS and CCMS was necessary for the effective calcium removal. When the pH of the solution was adjusted below 4.0, OCMS and CCMS were no longer an effective calcium-sequestering agent. Regardless of starch type, the adsorption capacities of two anionic starches reached a state of equilibrium within 30 min for starch dispersion in calcium salt solution. Adsorption of calcium ion followed modified Freundlich kinetics with the adsorption rate for adsorption on OCMS being higher followed by that on CCMS. The adsorption rate constant was found to decrease with the increase in the temperature. Adsorption isotherm models were developed wherein the best fit was obtained in the Langmuir model for OCMS and Freundlich isotherm for CCMS, respectively. Thermodynamic study indicated that the adsorption process of

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Author

Yan-Xiao Chen; Gong-Ying Wang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0927-7757)

Published

2006

Language

EN

Field

Materials Science (Physical Sciences)