用于隧道内尾气降解的复合改性纳米TiO_(2)研发  

Research and Development of Composite Modified Nano-TiO_(2) for Degradation of Tail Gas in Tunnel

作　　者：刘栋 罗银 冯学茂 宾武 武建民[3] 王红伟 覃仲 LIU Dong;LUO Yin;FENG Xue-mao;BIN Wu;WU Jian-min;WANG Hong-wei;QIN Zhong(Guangxi New Development Transportation Group Co.,Ltd.,Nanning Guangxi 530029,China;Zhongnan Institute of Safety and Environment Technology Co.,Ltd.,Wuhan Hubei 430000,China;Key Laboratory of Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi’an Shaanxi 710064,China)

机构地区：[1]广西新发展交通集团有限公司,广西南宁530029 [2]中南安全环境技术研究院股份有限公司,湖北武汉430000 [3]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064

出　　处：《当代化工》2023年第6期1289-1296,1302,共9页Contemporary Chemical Industry

基　　金：2021年广西交通运输行业重点科技项目,环保型高亮度隧道内抗滑面层修筑技术研究。

摘　　要：为解决隧道内汽车尾气对环境污染的问题,针对隧道内特殊的光照条件,研制了一种基于金属离子(Fe)、非金属离子(N)和半导体(WO_(3))的复合改性纳米TiO_(2),以提高汽车尾气降解效率。采用溶胶-凝胶法制备了复合改性纳米TiO_(2),并利用X射线衍射仪和紫外可见分光光度计对其进行性能表征。X射线衍射分析表明:复合改性使得纳米TiO_(2)晶粒变小,有利于纳米TiO_(2)更好地发挥表面尺度效应,提高光催化活性。紫外可见光漫反射分析表明:复合改性使得纳米TiO_(2)吸收光带发生明显红移,对可见光的吸收度增强。设计了三因素三水平的正交试方案,采用自制的尾气降解测试装置进行了尾气降解试验。结果表明:复合改性较单一改性提高了纳米TiO_(2)的催化效率,且Fe^(3+)的掺入量对尾气降解效果的影响最为显著,当Fe^(3+)掺量为1.69%、N掺量为1.5%、WO_(3)掺量为6.12%时,尾气降解效率最高。In order to improve the degradation efficiency of automobile exhaust in highway tunnel,which has the special lighting conditions,a nano-TiO_(2) based on the composite modification of metal ions (Fe),non-metal ions (N)and semiconductors (WO_(3)) was developed.Composite modified nano-TiO_(2) was prepared by sol-gel method,and its properties were characterized by X-ray diffractometer and UV-Vis spectrophotometer.X-ray diffraction analysis showed that the composite modification made the nano-TiO_(2) grains smaller,which was conducive to better play the surface scale effect of nano-TiO_(2).The diffuse reflectance analysis of UV and visible light showed that the composite modification made the absorption band of nano-TiO_(2) red shift obviously,and the absorption of visible light was increased.Orthogonal test scheme with three factors and three levels was designed,and the tail gas degradation test was carried out by using the self-made tail gas degradation test device.The results showed that the composite modification improved the catalytic efficiency of nano-TiO_(2),the addition of Fe^(3+)had the most significant effect on the degradation of tail gas.When the Fe^(3+)content was 1.69%,the N content was 1.5%and the WO_(3) content was 6.12%,the tail gas degradation efficiency was the highest.

关 键 词：公路隧道 尾气降解 纳米TiO_(2) 复合改性 性能表征 降解效率 

分 类 号：U416.2[交通运输工程—道路与铁道工程]