Abstract: Discharge of colored waste into the water cause a negative impact on physical, chemical and biological properties of environment. Besides carcogenic effects of certain pigments or dyes or strong colors on human beings also have been reported. Thus elimination of these commercial colorants from waste water is a major environmental concern.

PHOTOCATALYTIC DECOLORATION is one of the advanced oxidation process for the destruction of polluting materials. This paper describes an undergraduate laboratory experiment on the kinetics of heterogeneous photocatalytic decolorization of methylene blue in aqueous solution. Among the advanced oxidation processes, heterogeneous photocatalysis appears as an emerging destructive technology leading to the total mineralization of most of the organic pollutants. The experimental apparatus is simple and safe and aids the o learning of Advanced Oxidation Processes, utilizing concepts of kinetics and heterogeneous catalysis.

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