TiO2空心微球的制备及其在模拟太阳光下光催化降解罗丹明B活性

以钛酸丁酯为反应原料、油胺为模板剂,采用溶剂热法制备了TiO2空心微球.通过XRD、SEM、TEM、HR-TEM、N2吸附-脱附实验及FT-IR对其晶体结构、形貌、表面性质及比表面积进行了表征.在模拟太阳光下研究了TiO2对罗丹明B的光催化降解活性,并与商品TiO2(P25)的活性相比较.结果表明,空心微球为纯相锐钛矿型TiO2,球的直径处于2-5 μm之间,构成微球的初级粒子的平均粒径为10.7 nm,BET比表面积为42.95 m2/g.所制备的TiO2空心微球在2h内对罗丹明B溶液的光降解率达72％.因粒径较大而使其不易团聚,且极易回收,有利于实际应用.

Preparation of TiO2 hollow microspheres and their photocatalytic activity on rhodamine B in simulated sunlight

TiO2 hollow microspheres were synthesized by solvothermal method,using tetrabutyl titanate as the raw material and oleylamine as a template.The crystal structure,morphology,surface property and specific surface area of the as-prepared TiO2 hollow microspheres were characterized by XRD,SEM,TEM,HRTEM,FT-IR and N2 adsorption-desorption isotherm,respectively.The photocatalytic activity of the TiO2 on rhodamine B was investigated in simulated sunlight irradiation,and compared with that of P25.The results show that the hollow microspheres are pure anatase TiO2 with diameters of 2~5 μm,and the calculated average particle size is 10.7 nm.Its BET specific surface area is 42.95 m2/g.The photodegradation percentage of rhodamine B over the as-prepared TiO2 microspheres is 72% after 2 h reaction.Besides,it does not conglomerate and can be reclaimed easily due to the large particle size,which will benefit its application.