Tunable Photocatalytic Selectivity of Hollow TiO2 Microspheres Composed of Anatase Polyhedra with Exposed {001} Facets
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- 作者：Shengwei Liu ; Jiaguo Yu ; Mietek Jaroniec
- 刊名：Journal of the American Chemical Society
- 出版年：2010
- 出版时间：September 1, 2010
- 年：2010
- 卷：132
- 期：34
- 页码：11914-11916
- 全文大小：143K
- 年卷期：v.132,no.34(September 1, 2010)
- ISSN：1520-5126
文摘
A fluoride mediated self-transformation method is proposed for the synthesis of hollow TiO2 microspheres (HTS) composed of anatase polyhedra with exposed ca. 20% {001} facets. Importantly, HTS exhibit tunable photocatalytic selectivity in decomposing azo dyes in water. The fluorinated HTS show preferential decomposition of methyl orange (MO) in comparison to methylene blue (MB). In contrast, the surface-modified HTS by either NaOH washing or calcinations at 600 °C favor decomposition of MB over MO. The surface chemistry and the surface structure at the atomic level are key factors in tuning the adsorption selectivity and, consequently, photocatalytic selectivity of HTS toward azo dyes.