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- 2015
高活性碳氮共掺杂二氧化钛纳米线的制备与应用
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Abstract:
一维纳米线（尤其是非金属掺杂的一维纳米线）具有电荷移动速度快和载流子复合率低的特点，其温和条件下的制备备受关注。本文中碳氮共掺杂TiO2纳米线以硫酸钛为钛源、异丙醇为保护剂的水热法制备而成，并进行了XRD, SEM, HRTEM, SAED, XPS, BET和UV-Vis等表征。实验结果表明：经500 oC 煅烧得到的碳氮共掺杂TiO2纳米线含有TiO2 (B)和锐钛矿相，并在600 oC时完全转变为锐钛矿相；在可见光激发下，相比于碳氮共掺杂纳米颗粒和碳掺杂纳米线，制备的碳氮共掺杂纳米线对阿特拉津的降解效果更好。这是因为： i) 碳和氮的引入有缩短催化剂价带、有效分离光生电子空穴和增加光生电子等作用；(ii) 600 oC以上煅烧能延长锐钛矿到金红石的转化温度，避免产生催化活性低的金红石相。
： One-dimensional(1D) nanowire material (especially nonmetal doped 1D nanowires) synthesized by a facile way is of great significance and greatly desired as it has higher charge carrier mobility and lower carrier recombination rate. C, N-codoped TiO2 nanowires were synthesized using titanium sulfate as a precursor and isopropanol as a protective capping agent by a hydrothermal route. The obtained doped nanowires were characterized by XRD, SEM, HRTEM, SAED, XPS, BET and UV-vis absorption spectrum. The as-synthesized C, N-codoped TiO2 nanowires calcined at 500 oC have TiO2 (B) and anatase phase and then are completely transformed to anatase phase at the calcination of 600 oC. Photocatalytic activity measurement shows that the C, N-codoped TiO2 nanowires calcined at 600 oC reveals the best photocatalytic performance for the degradation of atrazine under visible light irradiation compared to C, N-codoped TiO2 nanoparticles and C-doped TiO2 nanowires, which was attributed to i) the synergistic effect of C and N doping in narrowing the band gap, separating electron-hole pairs and increasing the photoinduced electrons, and (ii) extending the anatase-to-rutile transformation temperature above 600 oC
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