title: Dye-sensitized TiO2-catalyzed photodegradation of sulfamethoxazole under blue or yellow light.
abstract: Visible light-induced photocatalysis is potentially advantageous and could be an efficient approach to degrade contaminants because it can be used to selectively target specific wavelength for decomposition of organic contaminants in water and wastewater. This study demonstrates the photodegradation of sulfamethoxazole (SMX) using [Pt(3,3'-dicarboxy-2,2'-bpy)(1,2-benzenedithiolate)] (Complex 1)-sensitized and [Pt(4,4'-dicarboxy-2,2'-bpy)(1,2-benzenedithiolate)] (Complex 2)-sensitized titanium dioxide (TiO2) under blue or yellow light (420 or 580 nm, respectively) irradiation in water. The Complex 1-sensitized TiO2photocatalytic oxidation of SMX reached almost 100 % removal under 420 nm irradiation for 3 h in water. In addition, the formation of hydroxyl radicals can be facilitated by bubbling O2during the photodegradation in which an effective decomposition of SMX was observed. Based on HPLC and UV-Vis studies of the decomposed products, it was found that SMX underwent cleavage of aromatic rings during the photodegradation process.
authors.affiliation: Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan. normanlu@ntut.edu.tw.
authors.forename: Norman
authors.initials: N
authors.lastname: Lu
authors.affiliation: Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan.
authors.forename: Yun-Peng
authors.initials: YP
authors.lastname: Yeh
authors.affiliation: Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan.
authors.forename: Guan-Bo
authors.initials: GB
authors.lastname: Wang
authors.affiliation: Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan.
authors.forename: Tsung-Yao
authors.initials: TY
authors.lastname: Feng
authors.affiliation: Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan. yhs@ntu.edu.tw.
authors.forename: Yang-Hsin
authors.initials: YH
authors.lastname: Shih
authors.affiliation: Department of Civil and Mechanical Engineering, Indiana University-Purdue University, 2101 E Coliseum Blvd, Fort Wayne, IN, 46805, USA. chend@ipfw.edu.
authors.forename: Dong
authors.initials: D
authors.lastname: Chen
mesh_terms: D004396:Coloring Agents / Q000737:chemistry*; D008027:Light; D010782:Photolysis; D013420:Sulfamethoxazole / Q000737:chemistry* / Q000528:radiation effects; D014025:Titanium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D004396:Coloring Agents; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014025:Titanium; D013420:Sulfamethoxazole
keywords: Emerging contaminant; Photodegradation; Pt-based dye; Sulfamethoxazole (SMX); Visible light irradiation