Dye-sensitized TiO₂-catalyzed photodegradation of sulfamethoxazole under blue or yellow light

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• 作者：Norman Lu ; Yun-Peng Yeh ; Guan-Bo Wang…
• 关键词：Sulfamethoxazole (SMX) ; Visible light irradiation ; Photodegradation ; Emerging contaminant ; Pt ; based dye
• 刊名：Environmental Science and Pollution Research
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：24
• 期：1
• 页码：489-499
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment, general; Environmental Chemistry; Ecotoxicology; Environmental Health; Atmospheric Protection/Air Quality Control/Air Pollution; Waste Water Technology / Water Pollution Control / Water M
• 出版者：Springer Berlin Heidelberg
• ISSN：1614-7499
• 卷排序：24

文摘

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 TiO₂ photocatalytic 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 O₂ during 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.