【摘要】 将活性炭负载与N掺杂有效结合,采用酸催化水解法在粉状活性炭（AC）表面合成TiO₂前驱体,在NH₃/N₂气氛中程序升温处理制得N掺杂TiO_2-xN_y/AC（TON/AC）光催化剂.以苯酚为模型物,考查了TON/AC紫外光区、可见光区及太阳光下催化活性以及分离性能、使用寿命.采用XPS、XRD、DRS、FTIR、SEM、低温氮物理吸附对光催化剂的表面特征、吸光特性、晶相结构等进行表征.结果表明,N以阴离子形式进入TiO₂体相并置换晶格中的O,适量N掺杂的TON/AC在紫外光区、可见光区及太阳光下均表现出较高的活性.N掺杂在TiO₂表面生成Ti-O-N键,形成新的能级结构,使催化剂的吸收红移至450～550nm,诱发TiO₂可见光催化活性.AC负载可降低TiO₂团聚体的尺寸,增加催化剂比表面积,为光催化降解提供高浓度环境,从而提高光催化效率同时还可改善催化剂分离性能,提高催化剂使用寿命.更多还原

【Abstract】 An efficient visible-light response composite photocatalyst TiO_2-xN_y/AC was prepared by calcination of the mixture of TiO₂ precursor made by acid catalyzed hydrolysis method and actived carbon （AC） in NH₃/N₂ atmosphere.Photocatalytic activity was investigated through the photocat- alytic degradation of phenol.The separability of TON/AC was determined by gravity sedimentation. X-ray photoelectron spectroscope,X-ray diffraction,diffuse reflectance spectroscope,Fourier transform infrared spectroscope,scanning electron microscope and N₂ adsorption isotherm were used for catalyst characterization.The results show that anion N is incorporated into TiO₂ lattice and substitutes part of O.TON/AC with suitable N-doping exhibits high activity under ultraviolet light,visible light and solar light irradiation.Also,TON/AC exhibits better decantability and less deactivation.Doped-N can form a new band gap above the valence band of TiO₂ which can extend the adsorption edge to 450-550nm.In addition,Aetived carbon support is beneficial to the high dispersion and large surface area of N-doped TiO₂.更多还原