Tunable Photocatalytic Selectivity of Hollow TiO 2 Microspheres Composed of Anatase Polyhedra with Exposed {001} Facets

作者：Shengwei Liu, Jiaguo Yu, Mietek Jaroniec · 发表于：Journal of the American Chemical Society · 年份：2010 · DOI：10.1021/ja105283s · 被引用次数：1013 · 研究领域：TiO2 Photocatalysis and Solar Cells、Advanced Photocatalysis Techniques、Advanced Nanomaterials in Catalysis

A fluoride mediated self-transformation method is proposed for the synthesis of hollow TiO(2) 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 degrees 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.