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| Effect of Ca/Ti Molar Ratio on Structure and Photocatalytic Properties of CaTiO3 with Dendrite Structure |
Weixia DONG1,2( ), Gaoling ZHAO2, Qifu BAO1, Xingyong GU1 |
1 Department of Materials Science and Engineering, Jingdezhen Ceramic Institute,Jingdezhen 333001, China
2 State Key Lab of Silicon Material & Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China |
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Cite this article:
Weixia DONG, Gaoling ZHAO, Qifu BAO, Xingyong GU. Effect of Ca/Ti Molar Ratio on Structure and Photocatalytic Properties of CaTiO3 with Dendrite Structure. Chinese Journal of Materials Research, 2017, 31(4): 279-284.
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Abstract Calcium titanite CaTiO3 with dendrite structure were prepared by solvothermal method while adjusting the molar ratio of Ca/Ti. The microstructure and optical performance of the prepared CaTiO3 were characterized by means of X-ray diffractometer (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared (FT-IR) spectrometer and UV-visible (UV-vis) spectrophotometer. The results show that Ca/Ti molar ratio has an important effect on the morphologies and phases of the prepared CaTiO3. The morphology of the obtained CaTiO3 changed from nano-sheets to aggregated prisms and then to butterfly-like dendrite structure with the increasing Ca/Ti molar ratio. The mechanism for the CaTiO3 morphology changes was atributed to the transformation from the oriented self-assembly accompanied by Ostwald ripening to the diffusion-controlled process of “dissolution”. When Ca/Ti molar ratio is 1/2-1/1.5, the prepared CaTiO3 is composed of nanosheets and aggregated irregular prisms. With the increase of Ca/Ti molar ratio, nanosheets transforms to irregular prisms. When Ca/Ti molar ratio is 1/1-1.2/1, the prepared CaTiO3 exhibited mainly dendritic morphology, which was gradually developed with the increasing Ca/Ti molar ratio. When the Ca/Ti molar ratio rises to 1.25/1 and 2/1, the phases of Ca3Ti2O7 and CaCO3 appear due to the excess amount of Ca2+ ions in the solutions. When Ca/Ti molar ratio is 1.2/1, pure CaTiO3 with dendrite structure, as a micrometer-scale structured material, showed the optimum value of 0.0187 min-1 for the photocatalytic degradation, which is much convenient for storage and handling.
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Received: 25 April 2016
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| Fund: Supported by National Natural Science Foundation of China (No.51502119), Major Natural Science Foundation of Jiangxi Province in China (No.20152ACB21022), Major Scientific and Technological cooperation foundation of Jiangxi Province in China (No.20161BBH80048), Educational Project of Jiangxi Province in China (No.GJJ14629) and Jingdezhen technology bureau (No.701301-352) |
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