紫外LED光催化降解三甲胺的实验研究  

Experimental Research on the Photocatalytic Oxidation of Trimethylamine with UV-LED Lamp

作　　者：朱倩文[1] 韩秋漪[1] 侯剑源 张仁熙[2] 张善端[1] 

机构地区：[1]复旦大学先进照明技术教育部工程研究中心,复旦大学电光源研究所,上海200433 [2]复旦大学环境科学与工程系,上海200433

出　　处：《照明工程学报》2016年第5期87-93,共7页China Illuminating Engineering Journal

基　　金：德清新明辉电光源有限公司资助

摘　　要：设计了一个光催化降解三甲胺用平板型反应装置,分别以紫外LED灯(UV-LED,峰值波长367.4 nm,半宽7.2 nm)与紫外荧光灯(主波长354.2 nm,半宽37.4 nm)作为光源,纳米TiO_2薄膜作为光催化剂。实验研究了三甲胺浓度、相对湿度和含氧量对三甲胺降解率的影响,比较了UV-LED灯与紫外荧光灯降解三甲胺的效率以及优缺点。实验结果表明,在相同辐照度下,UV-LED辐照的三甲胺的降解率、碳平衡、CO_2和CO产率都高于紫外荧光灯,说明UV-LED灯可取代紫外荧光灯用于光催化降解三甲胺;三甲胺初始浓度越高,降解率越低;对于两种光源,相对湿度在20%时光催化效果最佳。最后分析了三甲胺光催化降解的中间产物。For the purpose of photocatalytic decomposition of trimethylamine（ TMA）,we present a flat reactor coated with nanoscale TiO_2 thin film of catalyst on the inner surface using a ultraviolet light-emittingdiode lamp（ UV-LED,peak wavelength 367. 4 nm,half width 7. 2 nm） as light source and with a UV fluorescent-lamp（ UV-FL,peak wavelength 354. 2 nm,half width 37. 4 nm） as a control. With this reactor,we experimentally investigated the effects of initial concentration,relative humidity,oxygen concentration on the removal efficiency of TMA. The advantages of TMA removal efficiency of UV-LED over UV-FL are discussed. The results show the TMA removal efficiency,carbon balance,production rate of CO_2 and CO under the radiation of UV-LED are higher than that of UV-FL with same irradiance. The removal efficiency decreases with the increase of initial concentration of TMA. It demonstrates that UV-LED can take the place of UV-FL in the field of photocatalytic decomposition of TMA. The relative humidity 20% is optimal for both light sources. The intermediate products are analyzed for photocatalytic degradation of TMA.

关 键 词：UV-LED 紫外荧光灯 光催化降解 纳米二氧化钛 三甲胺 

分 类 号：X512[环境科学与工程—环境工程] TM923.34[电气工程—电力电子与电力传动]