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TiO_2前驱体,在NH_3/N_2气氛中程序升温处理制得N掺杂TiO_(2-x)N_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TiO_2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TiO_2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TiO_2可见光催化活性.AC负载可降低TiO_2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.
An efficient visible-light response composite photocatalyst TiO2-xNy/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 photocatalytic 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, Actived carbon support is beneficial to the high dispersion and large surface area of N-doped TiO2.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第3期464-470,共7页
Journal of Inorganic Materials
基金
教育部新世纪优秀人才资助计划
教育部博士点基金(20050225006)
国家自然科学基金(30400339)
关键词
TIO2
N掺杂
活性炭
光催化
TiO2
nitrogen doped
activated carbon
photocatalytic
