Abstract In order to improve the catalytic efficiency of titanium dioxide (TiO2) under visible light, TiO2 nanoparticles was composed with the silver-covered carbon nanotubes (CA) to form CNTs-Ag-TiO2 (CAT) ternary structure via in situ reduction combined with sol-gel method. The composite was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectra (DRS) and photoluminescence (PL) spectra. Using methylene blue (MB) as the model pollutant, photocatalytic activity of CAT was studied to investigate the influence of the composited amount of CA on the effect of photocatalysis. The results revealed that the photocatalytic activity of TiO2 under both visible light and UV light were improved by compositing with CA. When the mass ratio of CA is 15%, the degradation rare of methylene blue (MB) by CAT reached to 80.8% under visible light in 3 h, which is 16.5 times higher than that of TiO2. Accordingly, the degradation rate reached to 99.2% under UV light in 40 min, which is nearly twice as fast as that of TiO2.

中文翻译：

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CNTs-Ag-TiO2三元结构的制备增强可见光光催化降解有机染料污染物

摘要 为了提高二氧化钛（TiO2）在可见光下的催化效率，将TiO2纳米颗粒与银包覆的碳纳米管（CA）通过原位还原结合形成CNTs-Ag-TiO2（CAT）三元结构。溶胶-凝胶法。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、漫反射光谱（DRS）和光致发光（PL）光谱对复合材料进行表征。以亚甲基蓝（MB）为模型污染物，研究了CAT的光催化活性，研究了CA的复合量对光催化效果的影响。结果表明，与CA复合提高了TiO2在可见光和紫外光下的光催化活性。当CA的质量比为15%时，CAT对亚甲基蓝（MB）的降解率在可见光下3小时达到80.8%，是TiO2降解率的16.5倍。因此，紫外光下 40 分钟的降解率达到 99.2%，几乎是 TiO2 的两倍。