水热合成TiO_2纳米棒及其光催化降解甲基橙研究

Hydrothermal synthesis of TiO_2 nanorod and Their Application inphotocatalytic Degradation of Methyl Orange

以锐钛矿TiO2粉末为原料,采用水热法合成了Ti02纳米棒,并利用X射线粉末衍射仪(XRD)、透射电子显微镜TEM等手段对产品进行了表征.以甲基橙为模拟染料废水,TiO2纳米棒为催化剂,在紫外光照条件下考察TiO2纳米棒的投加量、甲基橙的初始浓度、光照时间、溶液pH值及重复使用次数对甲基橙光降解效率的影响。实验结果表明:TiO2纳米棒的投加质量浓度为0.2g/L,甲基橙初始浓度为10mg/L,pH为5～6;光催化反应3h后,甲基橙的降解率可达96.5%;TiO2纳米棒重复使用5次后,甲基橙的降解率仍然可达85.6%.

The TiO2 nanorod photocatalysts was prepared by Hydrothermal synthesis with the materials of titanium dioxide powder,and the morphology of TiO2 nanorod was characterized by mean of XRD and TEM technique.Methyl orange were used to simulate dye wastewater.The effect factors of the amount of TiO2 nanorod,inatial concentration of Methyl orange,pH value of solution,reation time were studied with TiO2 nanorod as catalyst under ultraviolet light.The experimental results show that there is an optimal catalyst dossge of 0.2g/L;inatial concentration of Methyl orang of 10mg/L,pH=5~6;the degradation rate of Methyl orange reached to 96.5% under ultraviolet light irradiation after 3h;TiO2 nanorod photocatalyst after 5 times reuse and the degradation rate of Methyl orange is 85.6%.