磁场-磁性颗粒负载纳米In2BiTaO7-可见光降解水中难降解有机污染物的协同作用与机理研究

项目名称： 磁场-磁性颗粒负载纳米In2BiTaO7-可见光降解水中难降解有机污染物的协同作用与机理研究

项目编号： No.20877040

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 武器工业

项目作者： 栾景飞

作者单位： 南京大学

项目金额： 33万元

中文摘要： 为解决悬浮体系中光催化剂粉末难以回收以及光催化效率低的问题，本研究拟以铁磁性颗粒、顺磁性颗粒和反铁磁性颗粒为载体，采用脉冲激光溅射沉积或多靶磁控溅射方法，首次成功制备了新型核（磁性颗粒）-壳（In2BiTaO7）复合催化剂颗粒。在磁场作用下，上述复合催化剂颗粒在水溶液中呈梯度分布特性，确保复合催化剂颗粒能够在水体的纵向垂直区域内呈连续梯度性分布，增加了光催化剂的利用率，进而改善了光催化降解五氯苯酚或阿特拉津的效率。重点研究了磁场-磁性颗粒负载In2BiTaO7-可见光－有机污染物的协同作用机制及其影响因素，探讨了磁性颗粒负载In2BiTaO7的微观结构、光学特性与光催化效率、光量子效率的关系，鉴定了目标物的光催化降解产物并分析其降解途径。本研究为开发快速、高效且无二次污染的光催化水处理技术提供理论指导和科学依据。开展本课题研究，对丰富光催化理论，拓宽光催化技术的研究及应用范畴具有积极意义。

中文关键词： 核-壳复合物；五氯苯酚；阿特拉津；可见光；磁场

英文摘要： In order to reclaim photocatalyst powder and improve photocatalytic efficiency, ferromagnetic compounds, sideromagnetic compounds and antiferromagnetic compounds were used as cores and the In2BiTaO7 photocatalyst was used as shell in this project. The novel core (magnetic compound)-shell (In2BiTaO7) compound was produced by reactively pulsed laser sputtering deposition method or by multi-target magnetron sputtering method. Under the condition of magnetic field, these core-shell compounds were distributed with concentration gradient in water. The photocatalysts could be used efficiently. Pentachlorophenol and atrazine could be degraded efficiently under visible light irradiation. The synergetic mechanism among magnetic compounds, photocatalysts, organic contaminants and visible light was studied. The structural,optical and photocatalytic properties of novel core-shell compounds were investigated. The results showed that the core-shell compounds owned high photocatalytic activity. The intermediate products were identified with pentachlorophenol or atrazine as contaminant. The possible photocatalytic degradation pathway of pentachlorophenol or atrazine was obtained under visible light irradiation. Our results could provide scientific basis for developing efficient water treatment technology.

英文关键词： Core-shell compounds;Pentachlorophenol；Atrazine；Visible light; Magnetic field