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Abstract
The photocatalytic activity of micro- and nano-titanium dioxide (TiO 2 ) has been utilized to significantly improve the degradation efficiencies of various contaminants in both water treatment and air pollution control. This article is a review of the literature covering current research on environmental applications of micro- and nano-TiO 2 . The mechanisms of contaminant degradation of nanoparticle TiO 2 are reviewed, and its special properties are compared to micro-sized TiO 2 in air purification and water treatment.