多壁碳纳米管负载TiO_2的光催化脱硝性能（英文）

Photocatalytic removal of nitric oxide by multi‐walled carbon nanotubes‐supported TiO_2

采用溶胶凝胶法制备了多壁碳纳米管负载TiO2(MWCNTs/TiO2),并利用透射电镜、X射线光电子能谱、X射线衍射和紫外-可见漫反射光谱对样品进行了表征.结果表明,MWCNTs/TiO2晶型以锐钛矿为主,MWCNTs的引入会限制TiO2晶粒的生长.另外,MWCNTs/TiO2的光吸收边向长波区域偏移.针对模拟烟气,在固定床光催化反应器中对采用涂覆处理的MWCNTs/TiO2的光催化脱硝性能进行了实验研究.结果表明,NO初始浓度较低时,光催化脱硝效率较高,SO2的存在可抑制光催化脱硝过程,而O2及H2O则有促进作用.在最佳实验条件(73 mg/m3 NO,8%O2,5%H2O)下,光催化脱硝效率可达46%.提出了光催化脱硝反应机理.

Multi-walled carbon nanotubes （MWCNTs） coated with TiO2 were prepared by a sol-gel method and characterized by transmission electron microscopy,X-ray photoelectron spectroscopy,X-ray diffraction,and UV-Vis diffuse reflectance spectroscopy.It was found that MWCNTs/TiO2 consisted mainly of anatase phase.The introduction of MWCNTs inhibited TiO2 grain growth.Moreover,the adsorption edge of MWCNTs/TiO2 shifted toward long-wavelength region compared with bare TiO2.The photocatalytic ability of MWCNTs/TiO2 for NO removal was experimentally investigated in a fixed-bed reactor.The results showed that a lower initial NO concentration was conducive to NO removal.A negative effect of SO2 on denitration was observed.In contrast,O2 and H2O played a promotional role in the photocatalytic denitration.At optimal conditions （73 mg/m3 NO,8% O2,5% H2O）,NO removal efficiency of 46% was achieved.In addition,the reaction mechanism of denitration was proposed.