Effects of pH on morphosynthesis and photocatalytic activity of calcium titanium oxides via a facile aqueous strategy

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• 作者：Weixia Dong ; Bin Song ; Gaoling Zhao ; Gaorong Han
• 关键词：A. Inorganic compounds ; B. Crystal growth ; B. Chemical synthesis ; C. Infrared spectroscopy ; D. Catalytic properties
• 刊名：Materials Research Bulletin
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：48
• 期：11
• 页码：4633-4640
• 全文大小：2703 K

文摘

By controlling pH values, calcium titanium oxides with various morphologies had been synthesized via a simple hydrothermal route. No surfactants or templates were involved in the shaping process. The results found that pH values had a crucial effect on the crystal phase and shape evolution of the samples. With increasing pH values, the obtained sample changed from one-dimension (1D) CaTi₂O₅ rod or shuttle-like shape to two-dimension (2D) CaTi₂O₄(OH)₂ nanosheets, and then to three-dimension (3D) CaTiO₃ aggregated prisms, butterfly-like dendrites and cross cubic shapes. The formation mechanism was proposed for the evolution of phase and morphology. 3D CaTiO₃ butterfly-like sample showed good photocatalytic activity due to unique morphology, enhanced light harvesting and large surface area.