Removal of Phenols from Water by a Photocatalytic Oxidation Process

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Abstract
Photocatalyst, CdS, upon irradiation by bandgap energy produces electrons and positive holes. The positive holes are strong oxidizing agents that can render organic compounds such as phenol oxidized. The rate of phenol oxidation depends upon factors such as pH, phenol concentration, photointensity, oxygen concentration and temperature. An increase in the degree of chlorination appears to render phenols more oxidizable. Among the chlorinated phenols studied, the ease in oxidation increases in the order: 2,4,6-trichlorophenol > 2,4-dichlorophenol > 2-chlorophenol > phenol.

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