摘要
为制备高性能光催化剂,以硫酸氧钛为无机前驱体,采用水热方法制备了高结晶度锐钛矿TiO2微球,用XRD,Raman,SEM等多种手段对TiO2微球进行了表征。结果表明,经700℃高温焙烧后的TiO2微球(T700)仍保持了锐钛矿结构,直径约为10μm,800℃焙烧后出现金红石相TiO2。光催化降解高毒性有机污染物2,4-二氯苯酚发现,T700具有最高的光催化活性,降解率达到99.5%,原因是其具有较高结晶度的锐钛矿晶体结构,减少了表面缺陷,从而利于光生电子-空穴对分离。
In order to prepare high-performance photo catalyst, anatase TiOa microspheres with high crystallinity were synthesized through hydrothermal method, via titanyl sulfate as inorganic precursor. The obtained TiO2 microspheres were characterized in detail by XRD, Raman and SEM. Experimental results indicated that TiOa microspheres after being calcined at 700 ℃ （T700） still possessed anatase crystalline structure. The diameters were about 10 μm. The rutile phase was present when the calcination temperature was up to 800 ℃. The photocatalytie degradation of highly toxic 2,4-dichlorophenol indicated that T700 possessed to 99.5 %, which was attributed to its high crystallinity, reduced the surface photo-generated electron-hole pairs. the highest photocatalytic activity, up defects, thus favored the separation of photo-generated electron-hole pairs.
出处
《黑龙江大学自然科学学报》
CAS
北大核心
2011年第6期827-831,共5页
Journal of Natural Science of Heilongjiang University
基金
黑龙江省教育厅科学技术面上项目(12511376)
关键词
二氧化钛
光催化
微球
高结晶度
水热法
TiO2
photocatalysis
microsphere
high crystallinity
hydrothermal method
