负载金的掺氮二氧化钛的制备及其可见光催化性能

以纳米管钛酸为前驱体,采用水热法先制备得到新型N掺杂二氧化钛,然后用沉积沉淀法在N掺杂二氧化钛表面负载微量贵金属Au,制备得到负载Au的掺N二氧化钛.利用TEM、XRD、XPS、ESR和DRS等手段研究了样品的形貌、晶体结构、元素化学态和光谱吸收性质.样品光催化活性通过可见光催化降解丙烯进行评价,结果表明,样品N-Ti...

Preparation of Gold-Modified Nitrogen-Doped TiO2 and Its Visible Light Photocatalytic Activity

N-doped TiO2 was obtained from nanotube titanic acid and aqueous ammonia by hydrothermal method,and then gold-modified N-doped TiO2 was prepared using deposition-precipitation method to deposit Au on the surface of N-doped TiO2.The physicochemical properties of resultant N-doped or Au/N-doped TiO2 samples were investigated by means of transmission electron microscopic(TEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),diffuse reflectance spectra(DRS),and electron spin resonance(ESR).The photocatalytic activity was evaluated by monitoring oxidation of propylene under visible light irradiation.Results indicated that N-TiO2 and Au/N-TiO2 showed obviously the visible light(λ≥420 nm) photocatalytic activity.The visible light sensitization was ascribed to the formation of single-electron-trapped oxygen vacancies.