| Abstract |
| The removal characteristics of As ion from aqueous solution by CTABr impregnated anthracite(CTAB-AT) was investigated under various conditions of contact time, pH and temperature. When the pH is 6, the zeta potential value of anthracite(AT) is -30 ㎷ and on the other hand, the zeta potential value of the CTAB-AT is +40 ㎷. It can be seen that the overall increase of about 70 ㎷. The kinetic study shows that As ion was adsorbed onto the CTAB-AT within the first 80 min, while equilibrium was arrived within 2 h for As ion. The experimental data was analyzed using equilibrium isotherm, kinetic and thermodynamic models. The isotherm data was well described by Langmuir isotherm model and Temkin model. The maximum adsorption capacity was found to be 7.81 mg/g for As ion from the Langmuir isotherm model at 298 oK. The kinetic data was tested using pseudo first and second order models. The results indicated that adsorption fitted well with the pseudo-second order kinetic model. The mechanism of the adsorption process showed that adsorption was dependent on intra particle diffusion model according to two step diffusion. The thermodynamic parameters(△Go, △Ho, and △So) were also determined using the equilibrium constant value obtained at different temperatures. The thermodynamic parameters indicated that the adsorption process was physisorption, and also an endothermic and spontaneous process. |
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| Key Words |
| CTABr-impregnated anthracite, isotherm model, adsorption, kinetic model, intra particle diffusion model, thermodynamic parameters |
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