Diketone-Mediated Photochemical Processes for Target-Selective Degradation of Dye Pollutants

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• 作者：Shujuan Zhang ; Xitong Liu ; Mengshu Wang ; Bingdang Wu ; Bingcai Pan ; Hua Yang ; Han-Qing Yu
• 刊名：Environmental Science & Technology Letters
• 出版年：2014
• 出版时间：February 11, 2014
• 年：2014
• 卷：1
• 期：2
• 页码：167-171
• 全文大小：252K

文摘

Free radical-mediated advanced photochemical oxidation processes are extensively studied for the degradation of variant pollutants. However, their practical application in dye-rich wastewater treatment is limited because of the poor efficiency and the slow degradtion rate caused by the poor reaction selectivity. Here we report that two small molecular diketones could act as effective photoactivators for dye degradation through a non-free radical pathway. Under ultraviolet (UV) irradiation, diketones form charge-transfer complexes with dyes, which might turn the target dyes from shields (inner filters in some photochemical processes, such as UV with H₂O₂ and UV with TiO₂) into spears. As a result, the diketone-mediated process is much more efficient and target-selective. Moreover, diketones and their degradation products have good biocompatibility, making this novel process potentially suitable as a pretreatment step in sequential chemical鈥揵iological wastewater treatment.