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硼氢化钠固态还原法制备氢化二氧化钛及其可见光催化性能
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Abstract:
以硼氢化钠为还原剂，通过调控反应温度和反应时间，采用固态还原法成功将白色锐钛矿二氧化钛还原为蓝色和黑色氢化二氧化钛，并对所得样品进行性质表征和性能测试。表征结果显示，氢化二氧化钛具有典型的核壳结构(TiO2/TiO2？x)，包含锐钛矿晶型内层和无序结构外层；氢化反应在无序层中引入大量缺陷，其中Ti3+和氧空位缺陷在导带下方形成杂质能级，降低氢化二氧化钛材料的禁带宽度，扩宽了光谱吸收范围，增强可见光区的光吸收和利用能力。通过制备条件调控缺陷含量获得最佳光催化性能，光催化降解罗丹明B (RhB)结果显示，300℃和50 min反应条件下制备所得蓝色氢化二氧化钛材料的光催化性能最佳，可见光照射下降解效率相比于白色二氧化钛提高了六倍。
With sodium borohydride as reducing agent, white anatase titanium dioxide was successfully reduced to blue and black hydrogenated titanium dioxide by solid state reduction method by adjusting the reaction temperature and time, and the properties of the obtained samples were characterized and tested. The characterization results show that the hydrogenated titanium dioxide has a typical core-shell structure (TiO2/TiO2？x), including the inner layer of anatase crystal and the outer layer of disordered structure. Hydrogenation reaction introduces a large number of defects in the disordered layer, among which Ti3+ and oxygen vacancy defects form impurity energy levels below the conduction band, reducing the band gap of hydrogenated titanium dioxide materials, widening the spectral absorption range, and enhancing the light absorption and utilization ability in the visible light region. The best photocatalytic performance was obtained by adjusting the defect content through the preparation conditions. The results of photocatalytic degradation of rhodamine B (RhB) showed that the blue hydrogenated titanium dioxide material prepared under 300？C and 50 min reaction conditions had the best photocatalytic performance, and the degradation efficiency under visible light irradiation was six times higher than that of white titanium dioxide.
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