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KMID : 1059519910350030226
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Journal of the Korean Chemical Society
1991 Volume.35 No. 3 p.226 ~ p.232
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Adsorption and Oxidation of Polychlorinated Phenols onto Transition Metal Oxides (Ⅰ). Adsorption Characteristics and Reductive Dissolution of δ-MnO2(s)
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Yun Jong-Hoon
Lim Jong-Wan
Lee Heung-Lark
Oh Sang-Oh
Lee Sun-Haing
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Abstract
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Adsorption and oxidation of polychlorinated phenols by suspended δ-MnO2 in aqueous solution have been studied. Of the proposed mechanism, adsorption reaction of chlorophenols onto δ-MnO2(s) depended upon the pH of the solution and the concentration of chlorophenol. Adsorption isotherms showed a reasonably good fit to the Langmuir isotherm. From the pH dependence of adsorption partition coefficient and the linear relationship between octanol-water partition coefficient and adsorption partiton coefficient of chlorophenol, it is estimated that adsorption is dominated by its hydrophobicity. The rate of electron transfer reaction evaluated from the rate of reductive dissolution of δ-MnO2(s) depended linearly upon the concentration of chlorophenol and the pH of medium. Observed rate constants (ko) of the meta-substituted chlorophenol were lower than that of the ortho-or para-chlorophenol because of resonance effect of chlorophenoxy radical. It is indicated that this radical is produced in the adsorption process and the electron transfer reaction is rate determining.
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