弱紫外光下NO_x气相光催化氧化研究  

Gas-Phase Photocatalytic Oxidation of NO_x under Weak Intensity UV Irradiation

作　　者：祝静艳[1] 曾玉燕[1] 匡代彬[1] 徐安武[1] 童叶翔[1] 

机构地区：[1]中山大学化学与化学工程学院,广东广州510275

出　　处：《中山大学学报（自然科学版）》2001年第6期31-34,共4页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：教育部博士点科研基金资助项目 (970 5 5 80 7);中山大学化学与化学工程学院本科生"创新生实验研究基金"资助项目

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NOxThe 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.

关 键 词：NOx 光催化氧化 弱紫外光 氮氧化物 二氧化钛薄膜 污染治理 光催化降解 

分 类 号：X131[环境科学与工程—环境科学]