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Effects of Calcination Temperature on Morphology, Microstructure, and Photocatalytic Performance of TiO2 Mesocrystals
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2017-07-11 00:00:00 , DOI: 10.1021/acs.iecr.7b01920 Geun Chul Park 1 , Tae Yang Seo 1 , Chae Hee Park 1 , Jun Hyung Lim 1 , Jinho Joo 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2017-07-11 00:00:00 , DOI: 10.1021/acs.iecr.7b01920 Geun Chul Park 1 , Tae Yang Seo 1 , Chae Hee Park 1 , Jun Hyung Lim 1 , Jinho Joo 1
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We synthesized TiO2 mesocrystals using a hydrothermal method and investigated the effect of calcination temperature (100–800 °C) on their morphology, crystallinity, and photocatalytic activity. While no appreciable changes in the shape, dimension, and crystal structure of the TiO2 nanoparticles (NPs) were observed as the calcination temperature increased to 300 °C, the crystallinity improved with increasing temperature. The mesocrystal form of the NPs began to disappear at 400 °C, and the specific surface area significantly decreased with increasing temperature owing to the reduced boundaries between the subunits and surface roughness of the NPs. The photocatalytic activity of the TiO2 NPs improved when the temperature increased to 300 °C because of the enhanced crystallinity and elimination of byproducts; on the other hand, it degraded above 400 °C due to the decreased surface area. These results suggest that controlling the calcination temperature is an effective way to tailor the morphology, crystallinity, and photocatalytic activity of TiO2 NPs.
中文翻译：
煅烧温度对TiO 2介晶的形貌，微观结构和光催化性能的影响
我们使用水热法合成了TiO 2介晶，并研究了煅烧温度（100–800°C）对其形貌，结晶度和光催化活性的影响。尽管在煅烧温度升至300°C时未观察到TiO 2纳米颗粒（NPs）的形状，尺寸和晶体结构发生明显变化，但结晶度随温度升高而提高。NP的介晶形式在400°C时开始消失，并且由于NP的亚单位之间的边界减少和表面粗糙度，比表面积随温度的升高而显着降低。TiO 2的光催化活性当温度升高至300°C时，NPs会改善，这是因为结晶度增强和副产物消除。另一方面，由于表面积减少，它在400°C以上会降解。这些结果表明，控制煅烧温度是调整TiO 2 NPs的形态，结晶度和光催化活性的有效方法。
更新日期：2017-07-12
中文翻译：
煅烧温度对TiO 2介晶的形貌，微观结构和光催化性能的影响
我们使用水热法合成了TiO 2介晶，并研究了煅烧温度（100–800°C）对其形貌，结晶度和光催化活性的影响。尽管在煅烧温度升至300°C时未观察到TiO 2纳米颗粒（NPs）的形状，尺寸和晶体结构发生明显变化，但结晶度随温度升高而提高。NP的介晶形式在400°C时开始消失，并且由于NP的亚单位之间的边界减少和表面粗糙度，比表面积随温度的升高而显着降低。TiO 2的光催化活性当温度升高至300°C时，NPs会改善，这是因为结晶度增强和副产物消除。另一方面，由于表面积减少，它在400°C以上会降解。这些结果表明，控制煅烧温度是调整TiO 2 NPs的形态，结晶度和光催化活性的有效方法。
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