采用溶胶-凝胶法合成了纳米二氧化钛光催化剂,利用X-射线衍射、原子力显微镜、紫外-可见分光光度计等测试技术研究了纳米二氧化钛的形态结构特征及其光催化性能,并探讨了甲基橙溶液的初始pH值和初始浓度、涂膜次数、光源种类、光照时间对光催化降解反应的影响机制.研究结果表明,采用紫外光源照射20min,纳米二氧化钛薄膜对甲基橙的光催化降解效率达到98%,纳米二氧化钛具有高光催化活性.
The nanocrystalline TiO2 photocatalyst was synthesized by sol-gel process.The microstructure,morphology and photocatalytic activities of as-prepared nano-TiO2 were studied using X-ray diffraction(XRD),atomic force microscopy(AFM)and ultraviolet-visible(UV-VIS)spectrophotometer.And the effects of methyl orange aqueous solution,coating times,illuminating source and irradiation time on the photodegradation of nano-TiO2 were also discussed.The results show that the photodegradation rate of methyl orange by nano-TiO2 film is 98%when illuminated for 20 min by UV source,indicating that the synthesized nanocrystalline anatase TiO2 thin film has remarkable photocatalytic efficiency.
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