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以钛酸四丁酯、硝酸银、碳纳米管为原料,通过溶胶-凝胶法制备了系列不同碳纳米管含量和热处理温度下的掺银TiO2颗粒/碳纳米管(Ag-TiO2/CNT)的复合催化剂,以甲基橙为目标降解物考察复合物的光催化活性。利用X-射线衍射(XRD),透射电子显微镜(TEM)和电子探针能谱仪(EDS)对所制的Ag-TiO2/CNTs复合材料进行了表征。结果表明:掺银TiO2颗粒在碳纳米管上均匀分布,所制复合材料具有较高的光催化性能。不同的热处理温度决定着催化效率的高低,在实验条件下,当热处理温度为600℃时,复合物的光催化活性较高。随碳纳米管含量的增加,催化活性逐渐增大,当碳纳米管的负载量在3.5%(碳纳米管/TiO2,重量百分比)时,催化活性达到最大值,超过该比例时,催化活性反而呈下降趋势。在600℃、碳纳米管负载量3.5%时,复合物光催化活性最高,降解率达90%以上。
A series of Ag-TiO2 / CNTs with different content of carbon nanotubes and heat treatment temperature were prepared by sol-gel method using tetrabutyl titanate, silver nitrate and carbon nanotubes as raw materials. The photocatalytic activity of the composite was investigated with methyl orange as the target degradation product. The prepared Ag-TiO2 / CNTs composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron probe spectroscopy (EDS) The results show that the silver-doped TiO2 particles are uniformly distributed on the carbon nanotubes, and the prepared composite material has high photocatalytic activity. Different heat treatment temperature determines the catalytic efficiency, under the experimental conditions, when the heat treatment temperature is 600 ℃, the composite photocatalytic activity is higher. As the content of carbon nanotubes increases, the catalytic activity gradually increases. When the amount of carbon nanotubes is 3.5% (carbon nanotubes / TiO2, weight percent), the catalytic activity reaches the maximum value, and when the ratio is exceeded, the catalytic activity is opposite Showing a downward trend. At 600 ℃, the photocatalytic activity of the composite was the highest at a loading of 3.5%, and the degradation rate was over 90%.