摘要
纳米二氧化钛(TiO_(2))是一种多功能的宽禁带半导体金属氧化物,直接水解法是合成纳米TiO_(2)的一种简单手段.钛酸四丁酯的水解过程是一个与水的亲核取代反应,OH-取代丁基形成Ti(OH)x沉淀和丁醇分子,而经过不同水解时长的前驱体在煅烧后得到的TiO_(2)具有不同的催化活性,也影响其对NO的降解性能.本研究以钛酸四丁酯作为原料,通过控制钛酸四丁酯的老化时间制备出了一系列Xh-TiO_(2)样品.其中,8h-TiO_(2)在浓度600 ppb的流动相NO气流中具有52%以上的去除活性,循环测试表明样品具有良好的催化稳定性.XRD表征证实所有样品均为典型的锐钛矿晶相,SEM观察其表面形貌,活性物种捕获实验证实光生空穴在催化NO去除中起重要作用.
Nano-titanium dioxide(TiO_(2))is a kind of multi-functional wide band gap semiconductor metal oxide.Direct hydrolysis method is a simple method to synthesize TiO_(2).The hydrolysis process of tetrabutyl titanate is a nucleophilic substitution reaction with water,in which OH-replaces butyl group to form Ti(OH)x precipitation and butanol molecules.However,TiO_(2)obtained after calcination of precursors with different hydrolysis time has different catalytic activities,which also affects NO degradation activity.In this study,a series of Xh-TiO_(2)samples were synthesized by using tetra-butyl titanate as raw material and controlling different aging time.The removal activity of 8h-TiO_(2)in the mobile phase NO flow with a concentration of 600 ppb was more than 52%,cyclic test showed that the sample had good catalytic stability.XRD characterization confirmed that all the samples were typical anatase crystal phase,SEM observation of the surface morphology,active species capture experiment confirmed that photogenerated holes plays an important role in the catalytic removal of NO.
作者
刘建利
董国辉
LIU Jian-li;DONG Guo-hui(School of Environmental Science and Engineering, Shaanxi University of Science & Techology, Xi′an 710021, China)
出处
《陕西科技大学学报》
北大核心
2021年第3期7-13,共7页
Journal of Shaanxi University of Science & Technology
基金
国家自然科学基金项目(21603271,21876104)。
关键词
二氧化钛
光催化
NO去除
水解
titanium dioxide
photocatalytic
NO removal
hydrolysis
