新型Zn^2＋掺杂C/Nb2O5纳米催化剂的制备及光催化性能

Preparation and Photocatalytic Performance of Novel Zn-doped C/Nb_2O_5 Nanoparticles Catalyst

采用水热技术制备了Zn掺杂的C/Nb_2O_5纳米催化剂.通过X射线衍射(XRD)、透射电子显微镜(TEM)和X射线光电子能谱(XPS)对催化剂进行了表征.结果表明,催化剂呈现较高的结晶度和较均匀的形貌,Zn元素以氧化锌的形式随机分布在C/Nb_2O_5纳米催化剂的表面,当锌/铌摩尔比为10%时,催化剂表面氧空穴(SOVs)的量会达到一个最优值.对染料罗丹明B(Rh B)和罗丹明6G(Rh6G)在可见光下的降解实验结果表明,与商业P25,Nb_2O_5以及C/Nb_2O_5相比,适量Zn掺杂的C/Nb_2O_5纳米催化剂具有更好的光催化活性.

Novel Zn-doped C/Nb_2O_5 nanoparticles were prepared via a simple hydrothermal method.The nanoparticles were characterized by X-ray diffraction（XRD）,transmission electron microscopy（TEM）and X-ray photoelectron spectroscopy（XPS）.The as-prepared nanoparticles presented enhanced crystallinity with ultrafine morphology and Zn element was confirmed to exit as the form of Zn O randomly on the surface of C/Nb_2O_5.The amount of surface oxygen vacancies（SOVs）on the catalyst surface reached an optimal value when the molar ratio of Zn/Nb was 10% proved by the XPS and surface photovoltage spectroscopy（SPS）results.The catalyst with an optimal doping amount of Zn exhibited much higher photocatalytic activity than P25 and commercial Nb_2O_5 towards degradation of Rhodamine B（Rh B）and Rhodamine 6G（Rh6G） under visible light irradiation.