title: Enhanced sorption and photodegradation of chlorophenol over fluoride-loaded TiO2.
abstract: The presence of NaF in the aqueous suspension of TiO(2) can accelerate the photocatalytic degradation of organic pollutants. However, disposal of such a fluoride-containing wastewater is not allowed by environmental regulation. In the present work, we report on surface modification of TiO(2) with a hardly water soluble salt, fluorite and fluorapatite. The modified catalysts at low loading displayed a higher activity than bare TiO(2) for the sorption and photocatalytic degradation of phenol and 2,4-dichlorophenol in water. A kinetic study using butanol as hydroxyl radical scavenger revealed that the fluoride-modified catalysts produced more hydroxyl radicals than bare TiO(2). Five repeated experiments showed that the fluorapatite-modified TiO(2) was very stable, and could be re-used without significant loss in activity.
authors.affiliation: State Key Laboratory of Silicon Materials and Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310027, China.
authors.forename: Shan
authors.initials: S
authors.lastname: Cong
authors.forename: Yiming
authors.initials: Y
authors.lastname: Xu
mesh_terms: D000327:Adsorption; D002384:Catalysis; D002733:Chlorophenols / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D007700:Kinetics; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D002733:Chlorophenols; C009495:titanium dioxide; D014025:Titanium; D005459:Fluorides