Heterogenization of Heteropoly Acids on the Activated Carbon Ⅲ. Adsorption of Dodecatungstosilicic Acid(SiW12)on Adivated Carbons in Acid Medium

Chinese Journal of Applied Chemistry ›› 1995, Vol. 0 ›› Issue (2): 9-12.

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Heterogenization of Heteropoly Acids on the Activated Carbon Ⅲ. Adsorption of Dodecatungstosilicic Acid(SiW₁₂)on Adivated Carbons in Acid Medium

Chu Wenling, Ye Xingkai, Wu Yue

Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Received:1994-08-30 Revised:1994-12-06 Published:1995-04-10 Online:1995-04-10

Abstract

Abstract: The adsorption of heteropoly acid(HPA)SiW₁₂ of Keggin structure on the acti-vated carbons of different sources has been studied in aqueous solutions of H₂SO₄, HCl,H₃PO₄ with H⁺ concentration of 3mol/L,aq. HAc solution and pure acetic acid. It is foundthat the forms of the adsorption isotherms of SiW₁₂ were different and the micropore struc-ture of the adsorbent and solvation of HPA have an important effect on HPA adsorption. Ininorganic acid medium the amount of the adsorbed HPA was higher than it was in water, andthere appeared a proportional relation between adsorptive capacity and acid strength of themedium. In organic acid medium the adsorption was more complex. An adsorption model ofHPAin acid medium is proposed.

Key words: dodecatungstosilicic acid, adsorption, activated carbon, heterogenization

Chu Wenling, Ye Xingkai, Wu Yue. Heterogenization of Heteropoly Acids on the Activated Carbon Ⅲ. Adsorption of Dodecatungstosilicic Acid(SiW₁₂)on Adivated Carbons in Acid Medium[J]. Chinese Journal of Applied Chemistry, 1995, 0(2): 9-12.

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Heterogenization of Heteropoly Acids on the Activated Carbon Ⅲ. Adsorption of Dodecatungstosilicic Acid(SiW₁₂)on Adivated Carbons in Acid Medium

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