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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Calcination on Structural, Photocatalytic Properties of TiO_2 Nanopowders Via TiCl_4 Hydrolysis
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Effects of Calcination on Structural, Photocatalytic Properties of TiO_2 Nanopowders Via TiCl_4 Hydrolysis

机译：煅烧对TiCl_4水解TiO_2纳米粉结构，光催化性能的影响

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摘要

Photocatalytic degradation of methyl orange (MO) in water was examined using TiO_2 nanopowders under solar irradiation. These photocatalysts were successfully synthesized by hydrolysis of titanium tetra chloride (TiCl_4) in the temperature range of 70-95℃ and calcined at higher temperatures of between 400 and 900℃. The samples prepared were characterized using x-ray powder diffraction, scanning electron microscope (SEM) and Fourier transform infrared spectrophotometer (FTIR). UV-Vis spectrometer was used for analyzing the concentration of MO in solution at different time intervals during the photodegradation experiment. Parameters affecting the photodegradation rate such as catalyst crystallinity, concentration of the catalyst, MO concentration, and pH of the solution have been investigated. The results indicate that TiO_2 nanopowder was antase at low calcination temperatures in the range of 400-500℃. The sample calcined at 600℃ is composed of both anatase and rutile phase. Further increase in the temperature enhanced the intensities of diffraction peaks of the rutile phase. The size of the crystallites for all the samples prepared were found to be in the 6-13 nm range and from SEM micrographs it was in the range of 19-43 nm. The mixture of both phases exhibited a higher photoactivity in comparison with pure anatase or rutile catalysts.
机译：使用TiO_2纳米粉在阳光下检测了水中甲基橙（MO）的光催化降解。这些光催化剂是通过在70-95℃的温度范围内水解四氯化钛（TiCl_4）并在400至900℃的较高温度下煅烧而成功合成的。使用X射线粉末衍射，扫描电子显微镜（SEM）和傅里叶变换红外分光光度计（FTIR）对制备的样品进行表征。在光降解实验中，使用紫外可见光谱仪分析溶液中不同时间间隔的MO浓度。已经研究了影响光降解速率的参数，例如催化剂的结晶度，催化剂的浓度，MO的浓度和溶液的pH值。结果表明，在400-500℃的低煅烧温度下，TiO_2纳米粉体是抗酶剂。 600℃煅烧的样品由锐钛矿相和金红石相组成。温度的进一步升高增强了金红石相的衍射峰的强度。发现所有制备的样品的微晶尺寸在6-13nm范围内，并且根据SEM显微照片其在19-43nm范围内。与纯锐钛矿或金红石催化剂相比，两相的混合物均表现出更高的光活性。

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