TiO2掺杂过渡金属真空紫外光催化去除空气中苯
首发时间:2015-09-02
摘要:本文以溶胶凝胶法制备TiO2基掺杂过渡金属系列光催化剂,利用SEM,XRD等对其形貌、结构、尺寸进行分析和表征;分别进行了气体湿度、流量以及初始浓度对185nm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,对比分析了以254nm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50ppm、空气流量1L/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254nm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。
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Vacuum ultraviolet (VUV) photocatalytic degradation of gaseous benzene using TiO2 modified by transition metals
Abstract:A series of transition metal modified TiO2 were developed by Sol-Gel Method,SEM and XRD methods were utilized to analyze the structure and morphology of catalysts. The influence of operating parameters such as humidity,flow rate and initial concentration of benzene on the 185 VUV photocatalysis oxidation process was studie. The photocatalysis performance of 185nm Vacuum ultraviolet photocatalysis was compared with the 254 nm Ultraviolet phtotcatalysis in the same operating parameters. The photocatalytic performance and ozone catalytic oxidation performance of TiO2 doped with different transition metal were studied.The results show that the highest Photocatalytic oxidation efficiency of benzene under VUV irradiation reached 58% with 1%Mn-TiO2 , which is over 20 times higher than that under 254 nm UV irradiation. In addition, ozone can be compeletely eliminated by Mn/TiO2.It can achieve both photolysi, photocatalytic and catalytic ozonation activities.oOH dominates benzene oxidation in the VUV photooxidation process.
Keywords: Vacuum ultraviolet photocatalysis TiO2 Transition metal
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