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DOI : 10.17640/KSWST.2016.24.2.13 ,    Vol.24, No.2, 13 ~ 26, 2016
Title
Adsorption Characteristics of Cu(Ⅱ) and Ni(Ⅱ) Ion by Mercapto Impregnated Mesoporous Silica(MMS) Adsorbent
김학윤 Hak-yoon Kim , 김정배 Jeung-bea Kim
Abstract
Mercapto-impregnated mesoporous silica(MMS) adsorbent has been developed for the removal of Cu(Ⅱ) and Ni(Ⅱ) ions by adsorption. These adsorbent have been characterized by elemental analysis, XRD and SEM analysis. To elucidate the surface characteristic of adsorbent, the zeta potentials were measured. As a result of zeta potential data, mesoporous silica(MS) indicated that the surface potentials seem to be dependent on the pH and the -10∼-25㎷ charge showed in the range of all pH. Otherwise, the surface potentials of MMS indicated that the -20∼-58㎷ charge in the range of all pH. MMS was tested for the removal of Cu(Ⅱ) and Ni(Ⅱ) ions from aqueous solution. Experiments were carried out as a function of pH and metal ion concentration in aqueous phase. The equilibrium time was 150 min and equilibrium experiment data obeyed the pseudo second order kinetic model. The Langmuir model represented the experimental data as well. The maximum adsorption capacity of Cu(Ⅱ) and Ni(Ⅱ) ions calculated from Langmuir isotherm model was 27.1㎎/g and 23.2㎎/g, respectively. To estimated thermodynamic parameters(△H^{0}, △S^{0} and △G^{0}) indicated that the adsorption was spontaneous and endothermic. The removal selectivity by MMS was in order by Ni(Ⅱ)
Key Words
Mercapto-impregnated mesoporous silica, zeta potential, copper, nickel, Langmuir model
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