Abstract
Heterogeneous photocatalysis is an efficient, economical and environmentally friendly technology for removing organic contaminants from the aqueous environment. Titania is one of the most popular photocatalyst for decomposing organic compounds due to its strong photocatalytic activity, chemical and biological inertness and high photochemical stability. Extensive literature analysis has shown many possibilities to improve the efficiency of photodecomposition of organic compounds over TiO2. Clay minerals with large surface areas for adsorption and high adsorption capacity used to synthesize nanocomposites with TiO2 (especially anatase) enhance the decomposition of organic pollutants by photocatalytic degradation. Recently, clay minerals have been used more often to prepare hybrid photocatalysts. Dispersing TiO2 nanoparticles onto the surfaces of clay minerals improves the photocatalytic activity of TiO2 by providing more active surface sites and reducing the agglomeration of TiO2 particles. The present review paper offers the following: an overview of the trend in the use of the clay/TiO2 nanocomposite photocatalysts, especially halloysite/TiO2 materials for removal of organic contaminants from water, report on the recent work done and important applications for photocatalytic degradation of organic pollutants.
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