| Abstract |
| Fe(Ⅲ)-impregnated mesoporous silicas were developed for the removal of selenite, arsenate, fluoride and phosphate ions by adsorption in aqueous phase. Mesoporous silica used for heavy metals adsorbents were prepared by co-condensation of surfactant as a template and Ludox HS-40 as a silica precursor. These materials characterized by elemental analysis, XRD and SEM analysis. To elucidate the surface characteristic of adsorbents, the zeta potentials were measured. As a result of zeta potential data, mesoporous silica indicated that the surface potentials seem to be independent on the pH and the low negative charge showed in the range of all pH. On the other hand, the surface potentials of Fe(Ⅲ)-impregnated mesoporous silica indicated that positive zeta potential charge at the pH 3∼8. Fe(Ⅲ)-impregnated mesoporous silica effectively removed 95% of 20 ppm arsenate(As) at pH 4.5∼8.0 and removed 83% of 20 ppm selenite(Se) at pH 4.5∼7.7, respectively. And Fe(Ⅲ)-impregnated mesoporous silica removed 80 % of 20 ppm fluoride(F) at pH 2.5∼7.0 and removed 86 % of 20 ppm phosphate(P) at pH 2.5∼8.0, respectively. The removal selectivity by the Fe(Ⅲ)-impregnated mesoporous silica was in the order of As > P > Se > F. |
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| Key Words |
| Mesoporous silica, Fe(3)-Impregnated mesoporous silica, Hazardous anion, zeta potential, adsorption |
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