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Citation: 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, 12(2): 9-12. shu

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

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

Received Date: 30 August 1994
Revised Date: 6 December 1994

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 found that 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. In inorganic acid medium the amount of the adsorbed HPA was higher than it was in water, and there appeared a proportional relation between adsorptive capacity and acid strength of the medium. In organic acid medium the adsorption was more complex. An adsorption model of HPA in acid medium is proposed.
- dodecatungstosilicic acid,
- adsorption,
- activated carbon,
- heterogenization
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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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Heterogenization of Heteropoly Acids on the Activated Carbon Ⅲ. Adsorption of Dodecatungstosilicic Acid (SiW₁₂) on Adivated Carbons in Acid Medium