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紫外LED光催化降解三甲胺的实验研究

     

摘要

For the purpose of photocatalytic decomposition of trimethylamine ( TMA ) , we present a flat reactor coated with nanoscale TiO2 thin film of catalyst on the inner surface using a ultraviolet light-emitting-diode 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 CO2 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.%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TiO2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、 CO2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。

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