可见光响应型二氧化钛/石墨烯磁性复合光催化剂催化氧化去除微囊藻毒素研究

项目名称： 可见光响应型二氧化钛/石墨烯磁性复合光催化剂催化氧化去除微囊藻毒素研究

项目编号： No.51309081

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 水利工程

项目作者： 陈义群

作者单位： 河海大学

项目金额： 25万元

中文摘要： 水体中的微囊藻毒素（MC）造成饮用水污染，对人体健康构成严重威胁，迫切需要寻求一种安全、经济、高效的方法去除MC，保障饮用水安全。本项目在传统TiO2光催化技术的基础上，综合石墨烯良好的电子传导特性、比表面积大、可降低电子-空穴复合和磁性材料便于回收的优点，制备可见光响应型纳米TiO2/石墨烯磁性复合光催化剂，对其晶相组成、微观形貌、比表面积、官能团和光吸收特性进行表征，并开展以下研究：复合光催化剂的可见光光催化活性及影响因素，复合光催化剂对微囊藻毒素MC-LR的光降解效率，pH、MC-LR初始浓度、催化剂用量、光照强度、腐殖酸和无机离子含量等因素对MC-LR光降解的影响，MC-LR的光降解过程、反应动力学，催化剂回收率及光催化活性持久性，以探索在可见光下利用TiO2光催化剂降解去除水中微囊藻毒素的可行性，为TiO2光催化技术在水处理中的实际应用提供科学依据。

中文关键词： 二氧化钛；石墨烯；磁性；微囊藻毒素；光降解

英文摘要： The microcystins pollution in the drinkwater threats the health of humanbeing. It is a pressing need to find a safety, efficient and economic method to removing the microcystins to ensure the security of drinking water. Based on the traditional titanium photocatalytic progress, the visible light response nanometer titanium oxide/graphene magnetic compound photocatalyst was prepared which combined the advantage of high charge carrier mobility, high specific surface area and reduction of electron-hole recombination of graphene and easily reuse of magnetic material. The crystalline structure, microstructure, specific surface area, function group and optical absorption propoties of the photocatalyst were characterized. In addition, studies were carried out as follows: the visible light photocatalytic activity and impact factors of the compound photocatalyst; the efficiency and effect of pH, initial substrate concentration, dosage of photocatalyst, illumination intensity, content of humid acid and inorganic ions on photodegradation of microcystin-LR; process and reaction kinetics of photodegradation of microcystin-LR by the composite; the reuse rate and photocatalytic persistence of the photocatalyst. The feasibility of application of titanium oxide photocatalyst on removal of microcystins in water under visible ligh

英文关键词： titanium dioxide；graphene；magnetism；micorcystins；photodegradation