Improved photocatalytic activity of anatase TiO₂-pillared HTaWO₆ for degradation of methylene blue

详细信息	查看全文 | 推荐本文 |

• 作者：Bi-Zhou Lin ; ^{bzlin@hqu.edu.cn} ; Xiao-Li Li ; Bai-Huan Xu ; Yi-Lin Chen ; Bi-Fen Gao ; Xiao-Rong Fan
• 关键词：Pillared materials ; Mesoporous materials ; Tantalotungstate ; Anatase ; Photocatalysis
• 刊名：Microporous and Mesoporous Materials
• 出版年：2012
• 期刊代码：78_13871811
• 类别：ch
• 出版时间：1 June, 2012
• 卷：155
• 期：Complete
• 页码：16-23
• 文件大小：824 K

摘要

Anatase TiO₂-pillared HTaWO₆ was prepared by assembling tantalotungstate nanosheets with anatase TiO₂ nanoparticles via an exfoliation-restacking route. The resultant materials were characterized by XRD, HRTEM, TG/DTA, FT-IR, XPS, UV-vis diffuse reflectance spectroscopy and N₂ adsorption-desorption measurements. It was shown that the host 2D sheet structure was retained after exfoliation, restacking and calcination. The pillared nanohybrid is mesoporous with a gallery height of about 2 nm and a specific surface area of 91 m²/g. There exists an electronic coupling between the host nanosheets and the guest nanoparticles in the pillared system. The results of degradation of methylene blue suggest that hybridizing with TiO₂ nanoparticles, HTaWO₆ exhibits an enhanced photocatalytical behavior. A photoexcitation model in the semiconductor-semiconductor pillared photocatalyst was proposed based on UV-vis, XPS and photoelectrochemical measurements.