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Characterization and photocatalytic activities of C, N and S co-doped TiO2 with 1D nanostructure prepared by the nano-confinement effect

机译:纳米约束效应制备一维纳米结构的C,N,S共掺杂TiO2的表征及光催化活性

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摘要

A novel method was developed for preparing high specific surface area (156.2 m(2) g(-1)) one-dimensional TiO2 nanostructures co-doped with C, N and S by the nano-confinement effect. A nonmetal doping source (thiourea) was first intercalated into the inner space of H-titanate nanotubes prepared by the hydrothermal method, and then calcined at 450 degrees C for 2 h in air. The as-prepared C, N and S co-doped TiO2 nanowires exhibited high visible light and enhanced UV-vis activities in photocatalytic degradation of toluene in the gas phase. The samples were characterized by x-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, fast Fourier transform analysis, x-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectra and photoluminescence. The results indicated that the anatase nanowires grew along the [101] direction. Doping TiO2 nanowires with C, N and S could not only broaden the light adsorption spectra into the visible region (400-600 nm), but also inhibit the recombination of photo-induced carriers. A mechanism is proposed to elucidate the nano-confinement effect of H-titanate nanotubes in the formation of C, N and S co-doping. Based on this mechanism, the effect of C, N and S co-doping on the band structure of TiO2 nanowires is also discussed.
机译:开发了一种通过纳米约束效应制备高比表面积(156.2 m(2)g(-1))一维TiO2纳米结构的共掺杂C,N和S的新方法。首先将非金属掺杂源(硫脲)插入通过水热法制备的H-钛酸盐纳米管的内部空间中,然后在空气中于450摄氏度煅烧2小时。制备的C,N和S共掺杂的TiO2纳米线在气相中甲苯的光催化降解中表现出高可见光和增强的UV-vis活性。通过X射线衍射,透射电子显微镜,高分辨率透射电子显微镜,快速傅里叶变换分析,X射线光电子能谱,紫外可见漫反射光谱和光致发光来表征样品。结果表明,锐钛矿纳米线沿[101]方向生长。用C,N和S掺杂TiO2纳米线不仅可以将光吸收光谱扩大到可见光区域(400-600 nm),而且可以抑制光诱导载流子的复合。提出了一种机制来阐明H-钛酸盐纳米管在C,N和S共掺杂形成过程中的纳米限制作用。基于这种机理,还讨论了碳,氮和硫共掺杂对TiO2纳米线能带结构的影响。

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