TiO2纳米晶制备条件对降解亚甲基蓝的影响研究

为研究不同的二氧化钛前驱体预处理条件对退火后二氧化钛性能的影响,以乙二醇和三氯化钛稀盐酸溶液为原料,在不同预处理条件下,采用溶剂热法制备了白色TiO2花状纳米球,并于320℃下退火,得到灰白色催化剂样品。对样品进行了结构、形貌及光催化性能测试。结果表明,在一定范围内,随着预处理搅拌时间的增加和预处理温度的升高,发现样品的晶相结构在退火之前无明显差异,但在320℃退火之后,样品会由单斜相二氧化钛逐渐趋于锐钛矿相。在预处理搅拌时间为11 h、预处理温度达到160℃的优化条件下,制备的催化剂样品为纳米薄片组成的花状纳米球二氧化钛,比表面积达到210 m2/g,光催化降解亚甲基蓝效率可达99.6%。

Effect of Preparation Conditions of TiO2 Nanocrystal on Degradation of Methylene Blue

In order to study the effect of different preparation conditions of titanium dioxide precursor on the annealing of titanium dioxide,a white TiO2flower-like nanospheres was prepared by using ethylene glycol and titanium trichloride dilute hy-drochloric acid solution,and was prepared by solvothermal method under different pretreatment conditions,then the sample of gray-white catalyst was obtained by annealing at 320℃.The structure,morphology and photocatalytic prop-erties of the sample were tested.The results showed that,in a certain range,as the pretreatment stirring time increased and the pretreatment temperature increased,the crystal structure of sample had no obvious differences before annealing,but the sample after 320℃annealing would tend from monoclinic phase TiO2to anatase phase.Under the condition of stirring time and temperature of pretreatment was 11 h and 160℃,the prepared catalyst was nanometer flake titanium dioxide,methylene blue catalytic degradation efficiency could reach 99.6%,and the surface area reached210 m2/g.