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Citation: Dai Minguang, He Lianhe, Lin Tianyao. The Effect of Zeta Potential of Activated Carbon on the Adsorption of Dyes from Aqueous Solution 3. The Adsorption of Anionic Dye Carmine[J]. Chinese Journal of Applied Chemistry, ;1995, 12(5): 62-66. shu

The Effect of Zeta Potential of Activated Carbon on the Adsorption of Dyes from Aqueous Solution 3. The Adsorption of Anionic Dye Carmine

Department of Chemistry, Fuzhou University, Fuzhou 350002

Received Date: 25 October 1994
Revised Date: 26 June 1995

In the present paper the adsorption of anionic dve carmine(CM) on the activated carbon under various pH has been studied, and revealed that the zeta potential of the activat-ed carbon has a large effect on the adsorption capacity of CM. The results show that the zeta potential of the carbon surface is positive when the pH of the suspension is lower than pH_zpc. Therefore, with decreasing zeta potential the electrostatic attraction between anionic dye and the carbon surface greatly reduces the adsorption capacity. On the other hand the color change of CM from orange to rose in the pH range 3.5~6.8 results to the solubility increase of CM with increasing pH. Therefore,the adsorption capacity is gradually reduced and down to vanish. The adsorption kinetics and thermodynamic parameters as a function of pH have been evaluated. The mechanism for adsorption of anionic dve CM on the activated carbon has also been studied.
- activated carbon,
- zeta potential,
- carmine,
- adsorption isotherm,
- adsorption mecha-nism
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