Adsorption behavior of carboxymethyl starch on titanium dioxide surfaces |
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Authors: | Yanxiao Chen Wanshun Li Xin Zhang |
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Institution: | 1.Chemical Engineering Institute,Sichuan University,Chengdu,China |
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Abstract: | The adsorption of carboxymethyl starch (CMS) on titanium dioxide surface from aqueous solution of electrolyte was investigated
by adsorption and electrokinetics mobility measurements. Zeta potential measurements showed that the addition of CMS resulted
in a shift of isoelectric point to the more acidic region, indicating the adsorption of CMS from the aqueous solution onto
titanium dioxide surface. The positively charged and hydrophilic surface sites of titanium dioxide favor the adsorption of
CMS molecules. The adsorption capacity of CMS on titanium dioxide surface was found to be controlled by the number of functional
group on CMS that promotes surface charge CMS adsorption in agreement with Langmuir isotherm. For the adsorption of CMS, the
pseudo-second-order kinetics of chemical reaction provides the best correlation of the experimental data. |
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