【摘要】 弱紫外光下 (室内自然光及太阳光 ) ,利用TiO2 薄膜对NOx 气相光催化氧化降解进行研究 .太阳光下 ,当相对湿度小于 80 %、流量为 0 5L·min-1时 ,NOx 光催化氧化降解率很高 ,最高达到 97% .对弱紫外下NOx 光催化氧化降解量子产率进行了较详细的研究与讨论 ,同时考察了气流湿度对NOx 光催化氧化活性的影响 .红外分析表明反应产物为硝酸 ,催化剂失活是由于反应产物硝酸吸附在催化剂表面而造成 .研究结果表明 ,TiO2 光催化氧化技术对大气中NOx 净化具有良好的应用前景更多还原

【Abstract】 The gas-solid heterogeneous photocatalytic oxidation using TiO 2 thin film was conducted, and it was found that the degradation efficiency of dilute NO x in air was very high, reaching a maximum of 97% under the sunlight irradiation at the optimal experimental conditions. The photocatalytic reaction quantum yields, and effects of relative humidity on the photocatalytic oxidation were studied. The product of NO x photocatalytic oxidation was detected to be HNO 3 by FTIR. The greater part of HNO 3 was adsorbed on TiO 2 surface, causing catalyst deactivation. The results showed that this process has potential applications for the elimination of NO x in air.更多还原