不同水热条件下TiO_2/电气石复合材料的光催化机制  

Photocatalytic Mechanism of TiO_2/schorl Composite by Different Hydrothermal Conditions

作　　者：亓淑艳[1] 吴超[1] 王德朋 胥焕岩[1] 

机构地区：[1]哈尔滨理工大学材料科学与工程学院,哈尔滨150080

出　　处：《无机化学学报》2017年第10期1789-1796,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学青年基金项目(No.51404083)资助项目

摘　　要：为了解决TiO_2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TiO_2/电气石(3%)复合材料,研究了水热时间(2~10 h)和水热温度(120~200℃)对TiO_2/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TiO_2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TiO_2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4 h条件下制备的TiO_2/电气石(3%)表现出最高的光催化降解罗丹明B的性能。说明TiO_2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。The TiO2/schorl（3%） were prepared by a hydrothermal method in order to solve the defects easy agglo-meration and wide band gap of TiO2. The influences of the hydrothermal time （2~10 h） and the hydrothermal temperature （120~200℃） on photocatalytic activity of TiO2/schorl（3%） were studied. It was found that the degra-dation 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 photo-catalytic performance. These results indicate that the material with spontaneous polarization can effectively improve the photocatalytic properties of TiO2.

关 键 词：水热法 TiO2/电气石 罗丹明B 光催化 第一性原理 

分 类 号：P578.953[天文地球—矿物学]