Global population growth along with everincreasing industrialization are significantly compromising access to safe drinking water. Advanced oxida- tion processes (AOPs) for wastewater treatment are emerging as one of the most efficient, renewable green chemical technologies among those being discussed to address this problem. Recently, photochemical oxidation of organic and inorganic pollutants has become an attractive technique for water purification and wastewater treatment. In order to increase the water treatment efficiency, the selection of suitable biogenic and cheaper photo catalyst, as well as a light source and an oxidation system, are some of the key parameters required. It is well known that sufficient UV penetration into the radiated liquid (promotion of efficient conversion of incident photons to charge carriers) is of paramount importance, especially for an opaque environment, and UV radiation is effective when very close to the UV lamp surface.