Adsorption Silver Ion By Chitosan Resin: Effect Of Temperature
Keywords:
อุษณีย์ รักษ์ไชยวรรณ, ยุพดี กูลรัตน์กิติวงศ์, โกวิทย์ ปิยะมังคลาAbstract
The chitosan resin was used as adsorbent for the adsorption of silver ion in batch process. The effect of temperature was thoroughly investigated. It was found that increasing temperature of silver ion increased the adsorption capacity. The highest adsorption capacity of the chitosan resin was 17.7 mg/g. The change of enthalpy was endothermic reaction. The thermodynamics study revealed that changes in enthalpy, entropy and Gibbs free energy were 29.9 kJ/mol, 94.9 J/mol-K and -306.3 J/mol, respectively. The Gibbs free energy was negative value, suggesting spontaneity of adsorption process. The pseudo-second order model was fit for describing the kinetics adsorption behavior. The mechanisms of the adsorption occurred in 2 steps. The rate limiting step for mechanism of adsorption was film diffusion.
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