Magnetic TiO₂-graphene composite as a high-performance and recyclable platform for efficient photocatalytic removal of herbicides from water

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• 作者：Yanhong Tang^a ; ^b ; Gan Zhang^b ; Chengbin Liu^b ; ^{chem_cbliu@hnu.edu.cn} ; Shenglian Luo^b ; ^{sllou@hnu.edu.cn} ; Xiangli Xu^b ; Liang Chen^b ; Bogu Wang^b
• 关键词：Graphene-TiO2 ; Photocatalyst ; Magnetic separation ; Reusability ; Herbicide removal
• 刊名：Journal of Hazardous Materials
• 出版年：2013
• 出版时间：15 May, 2013
• 年：2013
• 卷：252-253
• 期：Complete
• 页码：115-122
• 全文大小：1488 K

文摘

A new photocatalyst, magnetic TiO₂-graphene, was designed and facilely produced by combining sol-gel and assembling processes. Taking advantages of graphene and TiO₂, the catalyst exhibited strong light absorption in the visible region and high adsorption capacity to organic pollutants, resulting in almost 100 % photocatalytic removal efficiency of typical herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) from water under simulated solar light irradiation, far higher than 33 % on commercial P25. Toxicity assessment indicates the total decomposition of the original substrate. Furthermore, the catalyst can be rapidly recovered with highly stable photocatalytic performance. After 8 successive cycles, the removal efficiency of 2,4-D maintained 97.7 % , and particularly, 99.1 % 2,4-D removal efficiency came back at the ninth recycle when the catalyst was re-treated by ultrasonication. Moreover, even after being laid aside for one year the catalyst still kept the 2,4-D removal efficiency as high as 95.6 % . For practical application, the photocatalytic also demonstrated high removal efficiencies of herbicide 2,4-D. The photocatalyst is a promising platform for removing herbicide pollutants from water.