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TiO2掺杂过渡金属真空紫外光催化去除空气中苯

发表时间:2015-12-31  浏览量:1741  下载量:642
全部作者: 黄海保,占玉杰,徐颖,黄文君,张路,冯秋雨
作者单位: 中山大学环境科学与工程学院
摘 要: 以溶胶凝胶法制备TiO2基掺杂过渡金属系列光催化剂,利用扫描电子显微镜(scanning electron microscope,SEM)、X射线衍射(X-ray diffraction,XRD)等对其形貌、结构、尺寸进行分析和表征;分别进行气体湿度、流量及初始浓度对185 nm真空紫外光催化降解苯的影响实验,在与真空紫外光催化反应条件完全相同的情况下,对比分析以254 nm紫外灯为光源的光催化效果;对掺杂不同过渡金属TiO2基系列催化剂的光催化性能和臭氧催化氧化性能进行研究。实验结果表明:在进气湿度50%、苯浓度 50 ppm(1 ppm=3.487 mg/m3)、空气流量1 L/min的条件下,1% Mn掺杂改性TiO2光催化剂对苯的真空紫外光催化去除效果最好,达到58%,是相同条件下普通254 nm光催化效果的20倍以上,同时能够完全消除残余臭氧,具有光解、光催化降解和臭氧催化氧化三重功效。同时得出:真空紫外光反应中,羟基自由基的氧化是去除苯的主要途径。
关 键 词: 环境工程学;真空紫外光催化;TiO2;过渡金属
Title: Vacuum ultraviolet photocatalytic degradation of gaseous benzene using TiO2 modified by transition metals
Author: HUANG Haibao, ZHAN Yujie, XU Ying, HUANG Wenjun, ZHANG Lu, FENG Qiuyu
Organization: School of Environmental Science and Engineering, Sun Yat-Sen University
Abstract: A series of transition metal modified TiO2 were developed by sol-gel method,scanning electron microscope (SEM) and X-ray diffraction (XRD) methods were utilized to analyze the structure, size, morphology of catalysts. The influence of operating parameters such as humidity, flow rate and initial concentration of benzene on the 185 nm vacuum ultraviolet photocatalysis oxidation process was studied. The photocatalysis performance of 185 nm vacuum ultraviolet photocatalysis was compared with the 254 nm ultraviolet phtotcatalysis under the same operating parameters. The photocatalytic performance and ozone catalytic oxidation performance of TiO2 doped with different transition metals were studied. The results show that the highest photocatalytic oxidation efficiency of benzene under vacuum ultraviolet irradiation reaches 58% with 1%Mn-TiO2, which is over 20 times higher than that under 254 nm UV irradiation, and ozone can be compeletely eliminated. It can achieve photolysis, photocatalytic and catalytic ozonation activities. ·OH dominates benzene oxidation in the vacuum ultraviolet photooxidation process.
Key words: environment engineering; vacuum ultraviolet photocatalysis; TiO2; transition metal
发表期数: 2015年12月第24期
引用格式: 黄海保,占玉杰,徐颖,等. TiO2掺杂过渡金属真空紫外光催化去除空气中苯[J]. 中国科技论文在线精品论文,2015,8(24):2561-2569.
 
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