| 不同水热条件下TiO2/电气石复合材料的光催化机制研究 |
| Study photocatalytic mechanism of TiO2 / schorl composite by different hydrothermal conditions |
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| 摘要: 为了解决TiO2纳米光催化剂易团聚、禁带宽度大的缺点，本文采用水热法制备了TiO2/电气石（3%）复合材料，研究了水热时间（2 h -10 h）和水热温度（120℃ - 200℃）对TiO2/电气石（3%）的光催化性能的影响。发现光催化降解罗丹明B的降解率由单独TiO2的60 %提高到加入电气石后的99.4%。电气石具备自发极化电场效应，降低了TiO2的禁带宽度和光生电子和空穴的复合率。在水热温度160℃、水热时间4h条件下制备的TiO2/电气石（3%）表现出最高的光催化降解罗丹明B的性能。说明TiO2与这种有自发极化的材料复合能够有效提高其光催化性能。 |
| 关键词: 水热法 TiO2/电气石 罗丹明B 光催化 第一性原理 |
| 基金项目: 国家自然科学基金 |
| Abstract: The TiO2/schorl (3%) were prepared by a hydrothermal method in order to solve the defects easy agglomeration and wide band gap of TiO2. The influences of the hydrothermal time (2 h-10 h) and the hydrothermal temperature(120℃- 200℃) on photocatalytic activity of TiO2/schorl(3%) were studied. It was found that the degradation efficiency to rhodamine B improved from 60% (TiO2) to 99.4% by composited with schorl. The schorl shows spontaneous polarization electric field, which can effectively reduce the recombination rate of photogenerated electrons and holes of TiO2. The sample TiO2/schorl (3%) synthesized at 160 ℃ for 4 h shows the highest photocatalytic performance. These results indicate that the material with spontaneous polarization can effectively improve the photocatalytic properties of TiO2. |
| Keywords: hydrothermal method TiO2 /schorl Rhodamine B photocatalytic First- principles |
| 投稿时间：2017-05-24 修订日期：2017-08-25 |
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