【摘要】 以钛酸四正丁酯为原料,采用溶胶-凝胶法、溶胶-水热法及溶胶-微波法三种方法合成出纳米TiO2,借助XRD、UV-Vis吸收光谱等测试手段对其进行了表征,并以甲基橙为模型污染物,考察了样品的光催化性能。物相分析表明,所得样品均为锐钛矿相TiO2,与其它两种方法相比,溶胶-微波法合成的样品衍射峰明显宽化,强度明显降低,说明该法合成出纳米TiO2粒径较小;UV-Vis吸收光谱表明,溶胶-微波法合成的样品在可见光区和紫外光区对光均呈现更强的吸收,说明该法合成的粉末对光具有更高的利用率。光催化实验表明,溶胶-微波法合成样品的光催化活性高于另两种方法,紫外灯连续照射5h,甲基橙溶液脱色率为99.06%。此外,将该样品用于延安卷烟厂蒸叶车间废水的光催化氧化处理,效果较好,太阳光照射3d后COD去除率为77.4%。更多还原

【Abstract】 Using Ti (n-OC4H9)4 as raw materials,nano-TiO2 was synthesized via sol-gel,sol-hydrothermal and sol-mi- crowave method. X-ray diffraction (XRD) and UV-Vis absorption spectra technique were used to characterize the phase structure of as-synthesized samples,with methyl orange as model pollutant to review photocatalytic activity of TiO2. Phase analysis indicated that all samples were only anatase phase,and diffraction peak with sol-microwave synthesis was signifi- cantly lower than the other two methods,and TiO2 powder particle size was smaller by sol-microwave synthesis process. UV- Vis spectra revealed that microwave synthesis catalysts in the visible and ultraviolet light showed a stronger absorption,and the powder had a higher utilization rate of light. Photocatalytic experiment showed that photocatalytic activity by sol-mi- crowave process was significantly higher than the other two methods. Under ultraviolet irradiation of 5h,decolorization rate of methyl orange was as high as 99.06%.更多还原