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以钛酸丁酯为前驱体,碘溶胶为碘源,在室温下采用水解沉淀法制备了单质碘和纳米TiO2复合的双介孔结构光催化剂(M-I2-TiO2).采用X射线衍射(XRD)、透射电子显微镜(TEM)、比表面分析(BET)、紫外-可见(UV-Vis)漫反射光谱和傅里叶变换-红外光谱(FT-IR)对M-I2-TiO2进行了表征.以次甲基蓝(MB)溶液为模拟废水,对M-I2-TiO2的光催化性能进行了评价,研究了不同热处理温度对光催化活性的影响.结果表明,M-I2-TiO2在可见光区有显著的吸收,300℃热处理得到的样品比表面积高达227.6m2/g,600℃热处理所得样品的比表面积仍高达111.8m2/g,而400℃热处理所得样品具有最好的光催化降解性能.双介孔结构纳米TiO2/I2复合材料的光催化降解性能显著高于相同方法制备的纯TiO2和DegussaP-25商业产品.催化剂经6次重复使用其光催化活性基本保持不变.
Titanium tetrabutyl titanate as precursor and iodine sol as iodine source were prepared by hydrolytic precipitation at room temperature.The mesoporous structure photocatalysts (M-I2-TiO2) with single-phase iodine and nano-TiO2 were prepared by X-ray diffraction X-ray diffraction (XRD), transmission electron microscopy (TEM), surface area analysis (BET), UV-Vis diffuse reflectance spectroscopy and Fourier transform infrared spectroscopy (FT-IR) The photocatalytic activity of M-I2-TiO2 was evaluated by using methylene blue (MB) solution as simulated wastewater.The effects of different heat treatment temperatures on the photocatalytic activity were studied.The results showed that M-I2- The specific surface area of the sample obtained by heat treatment at 300 ℃ is as high as 227.6m2 / g. The specific surface area of the sample obtained after heat treatment at 600 ℃ is still as high as 111.8m2 / g, while the sample obtained by heat treatment at 400 ℃ has the best photocatalytic degradation performance. The photocatalytic degradation performance of the mesoporous nanostructured TiO2 / I2 composites was significantly higher than that of the pure TiO2 and Degussa P-25 commercial products prepared by the same method. The photocatalytic activity of the nanosized TiO2 / I2 composites remained unchanged after 6 repeated uses.