摘要
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-TiO2和Au/N-TiO2具有明显的可见光(λ≥420 nm)催化活性.ESR结果表明,掺氮过程中生成的束缚单电子的氧空位是样品具有可见光响应的原因.
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 depositionprecipitation 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.
出处
《影像科学与光化学》
CAS
CSCD
北大核心
2011年第5期353-363,共11页
Imaging Science and Photochemistry
基金
国家自然科学基金(20973054)
关键词
TIO2
金负载
氮掺杂
光催化
TiO2
Au
N-doped
visible light
photocatalytic activity
