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用电泳沉积法在铟锡氧化物(ITO)导电玻璃上制备了TiO2/多壁碳纳米管(MWCNTs)纳米复合薄膜。对薄膜的表面形貌、晶相结构和光谱特性进行表征。以罗丹明B为模拟污染物对薄膜的光催化活性进行测定,讨论了罗丹明B溶液的pH值、通入气体以及不同辐射光波对薄膜光催化性能的影响。结果表明:制备的TiO2/MWCNTs薄膜是粒子结合紧密、粒径和孔径分布均匀的介孔纳米复合薄膜。该薄膜具有较高的光催化活性,以卤钨灯光照120min,对罗丹明B的降解率达到92.4%,是TiO2薄膜的1.2倍。复合薄膜光催化活性的提高,主要归因于膜层中形成TiO2/MWCNTs异质结和良好的碳纳米管电子通道,以及薄膜对O2和激发电子还原反应的催化作用。
TiO2 / MWCNTs nanocomposite films were prepared on indium tin oxide (ITO) conductive glass by electrophoretic deposition. The surface morphology, crystal structure and spectral properties of the films were characterized. The photocatalytic activity of Rhodamine B as a simulated pollutant was measured. The effects of pH value of Rhodamine B solution, gas and different light waves on the photocatalytic activity of the films were discussed. The results show that the prepared TiO2 / MWCNTs films are mesoporous nanocomposite films with uniform particle size distribution and uniform pore size distribution. The film has high photocatalytic activity, with halogen lamp illumination 120min, the degradation rate of rhodamine B 92.4%, is 1.2 times the TiO2 film. The enhancement of the photocatalytic activity of the composite films is mainly attributed to the formation of TiO2 / MWCNTs heterojunction and good carbon nanotube channels in the film and the catalytic effect of the films on O2 and excited electron reduction.