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Charge transfer between biogenic jarosite derived Fe^3+ and TiO2 enhances visible light photocatalytic activity of TiO2

查看全文 作　　者：Mahabubur [1]Chowdhury;Sipiwe [2]Shoko;Fransciuos [3]Cummings;Veruscha [1]Fester;Tunde Victor [2]Ojumu 高影响力作者 机构地区：[1]Flow Process and Rheolofy Centre, Cape Peninsula University of Technology, South Africa;[2]Department of Chemical Engineering, Cape Peninsula University of Technology, South Africa;[3]Electron Microscope Unit, University of the Western Cape, South Africa高影响力机构 出　　处：《Journal of Environmental Sciences》索引2017年第29卷第4期,共12页高影响力期刊 基　　金：supported by the National Research Foundation(No.88220,and 91510) 摘　　要：In this work, we have shown that mining waste derived Fe^(3+)can be used to enhance the photocatalytic activity of TiO_2. This will allow us to harness a waste product from the mines, and utilize it to enhance TiO_2 photocatalytic waste water treatment efficiency. An organic linker mediated route was utilized to create a composite of TiO_2 and biogenic jarosite. Evidence of Fe\O\Ti bonding in the TiO_2/jarosite composite was apparent from the FTIR, EFTEM, EELS and ELNEFS analysis. The as prepared material showed enhanced photocatalytic activity compared to pristine TiO_2, biogenic jarosite and mechanically mixed sample of jarosite and TiO_2 under both simulated and natural solar irradiation. The prepared material can reduce the electrical energy consumption by 4 times compared to pristine P25 for degradation of organic pollutant in water. The material also showed good recyclability. Results obtained from sedimentation experiments showed that the larger sized jarosite material provided the surface to TiO_2 nanoparticles, which increases the settling rate of the materials. This allowed simple and efficient recovery of the catalyst from the reaction system after completion of photocatalysis. Enhanced photocatalytic activity of the composite material was due to effective charge transfer between TiO_2 and jarosite derived Fe^(3+)as was shown from the EELS and ELNEFS. Generation of OHU was supported by photoluminesence(PL) experiments. 关 键 词：TIO2纳米粒子 光催化活性 黄钾铁矾 电荷转移 二氧化钛 生物 衍生 复合材料
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