N和Al共掺杂TiO_2粉体的固相合成及可见光降解性能

Synthesis of N and Al Co-doped TiO_2 Particles with Visible Light Degradation Property via Solid State Reaction Route

采用固相反应法合成了N与Al共掺杂TiO2(N-Al-TiO2)粉体材料,利用XRD,UV-Vis,N2吸附及XPS等对其进行了物相织构表征,并研究了可见光辐照下催化剂对中性红的降解性能.结果表明,N和Al均进入TiO2晶格或晶格间隙,材料表面不仅存在替位取代形成的N-Ti-O与Ti-O-Al键,且存在间隙掺杂形成的Ti-N-O与Ti-O-N键.与纯TiO2相比,N-Al-TiO2对中性红显示出很高的可见光降解活性,2h内中性红的降解率为95.8%,降解过程服从一级反应动力学规律.

N and Al co-doped TiO2（N-Al-TiO2） particles were successfully synthesized via a solid-state reaction route.Their properties were characterized by XRD,N2 adsorption-desorption,UV-Vis and XPS.The photodegradation of neutral red（NR） on the N-Al-TiO2 material irradiated with visible light was investigated.The XPS results clearly show that both N and Al have been incorporated into the lattice of TiO2.The N-Ti-O and Ti-O-Al bonds formed by lattice substitution and Ti-N-O and Ti-O-N bonds configured by interstitial doping on the N-Al-TiO2 material surface are presented.Compared with pure TiO2,the photodegradation properties of NR on the N-Al-TiO2 shows excellent visible light catalytic properties,the degradation rate of NR is 95.8% in 2 h,and the degradation process of NR follows the principle of pseudo-first-order reaction.