蒸汽处理钛酸制备锐钛矿相TiO2纳米晶体的光催化性能

Photocatalytic Properties of Anatase TiO_2 Nanocrystal Prepared by Steam Treatment

采用水热法,以锐钛矿相TiO2为原料,10 mol/L NaOH溶液作为矿化剂,合成了钛酸钠纤维。用XRD和TEM对产物进行了表征,观察到纤维长度超过10μm,宽度为10～100 nm。酸洗后对其进行二次蒸汽处理,得到了具有自组织趋势的锐钛矿相纳米TiO2晶体纤维。以1 kW紫外灯为光源,分析了合成的锐钛矿相TiO2纳米晶体的光催化降解亚甲基蓝性能及其长期稳定性。结果表明:合成的锐钛矿相TiO2纳米晶体对亚甲基蓝的光降解活性很高,纳米晶体易回收,且循环使用光催化活性没有发生衰减。

Sodium titanate fibers with lengths over 10 μm and widths of 10-100 nm were synthesized via hydrothermal method using anatase TiO2 as titanium source and NaOH as mineralizer, the products were characterized by transmission electron microscopy （TEM） and X-ray diffraction （XRD）. Using steam hydrothermal method to further treat sodium titanate nanofibers which was washed by HC1, anatase TiO2nanofibers with character of self-organizing were synthesized. Their degradation performance of methylene blue under 1 kW ultraviolet lamp and long-term stability was investigated. Photocatalytic experimentsindicated that the obtained anatase TiO2 nanofibers are highly active for methylene blue, and these nanocrystal catalysts could be easily recycled without decreasing of the photocatalytic activity.