2001•Chinese Journal of Applied ChemistryRequires access

Adsorption and Photocatalytic Degradation of Humic Acid Catalyzed by Nano-TiO_2

Fan Cai

Abstract

The adsorption behavior and photocatalytic degradation of humic acid(HA) on nano TiO 2 particles in water have been studied under UV illumination as functions of pH and the concentration of TiO 2. The results showed that the adsorption of HA on TiO 2 particles was pH dependent and pzc(point of zero charge of TiO 2) dependent due to electrostatic interaction. The adsorption behavior of HA on TiO 2 particles played a very important role in the photocatalytic process. Increasing TiO 2 concentration in a neutral medium enhanced the photodegradation.

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Key concepts: Point of zero charge, Chemistry, Adsorption, Photocatalysis, Humic acid, Photodegradation, Catalysis, Degradation (telecommunications)