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机构地区:[1]黑龙江大学化学化工与材料学院,黑龙江哈尔滨150080
出 处:《黑龙江大学自然科学学报》2007年第2期241-244,共4页Journal of Natural Science of Heilongjiang University
基 金:国家自然科学基金资助项目(20431030;20501007);黑龙江省自然科学基金资助项目(ZJG0404;B0305);黑龙江省教育厅骨干教师创新能力计划(1054G035);哈尔滨市科学基金资助项目(2005AFQXJ060)
摘 要:通过溶胶-水热法制备了不同晶相组成的TiO2纳米粒子,并利用XRD,Raman光谱等方法对样品进行了表征,同时考察了晶相组成对TiO2光催化降解罗丹明B活性的影响。结果表明,热处理温度为400℃时,TiO2纳米粒子为锐钛矿相。从400℃到700℃是锐钛矿向金红石的相转变过程。当热处理温度升至700℃时,TiO2纳米粒子完全为金红石相。在光催化实验中,580℃热处理的TiO2纳米粒子表现出较高的光催化活性,且随着热处理温度的进一步升高,光催化活性下降,这能够从晶相组成上给出解释。TiO2 nanoparticles of different crystal phase were prepared by a sol - gel method, and also were characterized by XRD, Raman testing techniques. The influences of crystal phase on the photocatalytic performance for degrading liquid phase Rhodanmine B has been further investigated. It indicated that TiO2 nanoparticles could be formed when calcined at 400 ℃. As the calcinaton temperature increases, the crystallinity becomes more perfect, the crystal phase transforms futile from anatase. TiO2 nanoparticles were futile when calcined at 700 ℃. Moreover, in the experiment of photocatalytic degradation liquid phase RhB, TiO2 nanoparticles calcined at 580 ℃ exhibited a higher photocatalytic activity and the photocatalytic activity declined as the caclination temperature increased,which was coincident with the results of the characterization.
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