Pt/TiO_2光催化降解苯的磁场效应研究  

Study of Magnetic Field Effect on Photocatalytic Degradation of Benzene over Pt/TiO_2

作　　者：张雯[1] 王绪绪[2] 付贤智[2] 

机构地区：[1]福建师范大学化学与材料学院,福州350007 [2]福州大学化学化工学院光催化研究所,福州350002

出　　处：《化学学报》2005年第8期715-719,共5页Acta Chimica Sinica

基　　金：国家自然科学基金(No. 20133010);福建省教育厅(No. JB04238)资助项目.

摘　　要：采用连续流动微分反应体系考察了外加磁场对Pt/TiO2 光催化降解苯反应性能的影响, 发现一定强度的外加磁场可提高气相光催化降解苯的反应活性. 结合瞬态光电导法和原位傅立叶变换红外技术研究了外加磁场对光生载流子寿命和反应中间体分布的影响, 结果表明, 外加磁场不仅延长了光生载流子的寿命, 而且提高了某些中间体的转化率,从而改善了光催化降解反应的活性.The magnetic field effect on heterogeneous photocatalytic degradation of benzene over Pt/TiO2 has been observed by on-line GC. Time-resolved photoconductivity and in-situ FTIR were used to investigate the influence of magnetic field on the photogenerated charge carrier lifetime and the intermediate distribution, respectively. The results showed that in the presence of magnetic field the effective lifetime of the photogenerated charge carriers was prolonged with the increase of the magnetic field intensity. The results also indicated that the application of the external magnetic field not only favored the conversion of benzene, but also facilitated the transformation from phenol to quinone, resulting in improving the activities of the photocatalytic degradation.

关 键 词：光催化降解反应 磁场效应 苯 二氧化钛 铂 原位傅立叶变换红外光谱 转化率 污染治理技术 

分 类 号：O643.32[理学—物理化学]