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采用三种不同的氮源溶剂热合成了锐钛矿-板钛矿混晶的N-TiO2催化剂.采用X射线衍射、N2吸附-脱附、X射线光电子能谱和透射电子显微镜等手段对催化剂进行了表征.重点研究了不同氮源对催化剂的相组成、晶粒尺寸、微观结构以及比表面积的影响.采用紫外光降解气相苯测试了合成材料的催化活性.结果表明,以水合肼为氮源合成的N-TiO2表现出最优的光催化活性,其活性明显高于P25,且能够循环使用15次以上.采用气相色谱-质谱技术分析了光降解过程的中间产物,基于此提出了相应的降解机理.
The anatase-brookite mixed N-TiO2 catalyst was synthesized by three different nitrogen source solvates. The catalysts were characterized by X-ray diffraction, N2 adsorption-desorption, X-ray photoelectron spectroscopy and transmission electron microscopy The effects of different nitrogen sources on the phase composition, the grain size, the microstructure and the specific surface area of the catalyst were investigated. The catalytic activity of the synthesized material was tested by UV degradation of gaseous benzene. The results showed that the hydrazine hydrate as nitrogen The synthesized N-TiO2 showed the best photocatalytic activity, its activity was significantly higher than that of P25, and it could be reused more than 15 times. The intermediate products of photodegradation process were analyzed by gas chromatography-mass spectrometry Degradation mechanism.