A novel mixed-phase TiO₂/kaolinite composites and their photocatalytic activity for degradation of organic contaminants

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• 作者：Yalei  ; Zhang^a ;   ; ^{zhangyalei06@126.com} ; Huihui  ; Gan^b ; Gaoke  ; Zhang^b ;   ; ^{gkzhang@whut.edu.cn} ;   ; ^{zgkwu@126.com}
• 关键词：TiO₂ ; Kaolinite ; Heterojunction ; Photocatalysis ; Acid red G ; 4-Nitrophenol
• 刊名：Chemical Engineering Journal
• 出版年：2011
• 出版时间：15 August 2011
• 年：2011
• 卷：172
• 期：2-3
• 页码：936-943
• 全文大小：1055 K
• ISSN：S1385894711008321

文摘

We successfully synthesized the TiO₂/kaolinite (TiO₂/Kao) composites with mixed phase TiO₂ using a simple method at low temperature. The as-prepared TiO₂/Kao composites were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), nitrogen adsorption/desorption measurements, Fourier transform infrared (FT-IR) spectroscopy and UV–vis diffuse reflectance spectra (DRS). The X-ray diffraction analysis indicated that the binary mixtures of anatase and rutile or the binary mixtures of anatase and brookite or the ternary mixtures of anatase, brookite, and rutile exist in the TiO₂/Kao composites. The specific surface area of the TiO₂/Kao composites is much higher than that of the kaolinite. The as-prepared samples exhibited strong photocatalytic activity for the removal of acid red G (ARG) and 4-nitrophenol (4-NP). The composites obtained at 70 °C showed the highest photocatalytic activity, in which the mixed phases of anatase and brookite existed. The high specific surface area and heterojunction microstructure could be responsible for the high photocatalytic activity.