【作者】 姜勇；

【导师】 解强；

【作者基本信息】 中国矿业大学（北京） ， 环境工程， 2011， 博士

【摘要】 论文首先研究了TiO2在典型商品活性炭载体上的负载,得到比表面积适中且中孔发达的褐煤基活性炭适合作为光催化剂的载体。然后,以褐煤为原料、Fe3O4为赋磁剂、水蒸气活化法制备了煤基磁性活性炭作为载体,采用溶胶—凝胶法制备了TiO2/磁性活性炭复合光催化剂并对其性能进行表征,以苯酚为模型化合物,对其光催化性能进行评价,同时还探讨了磁性活性炭和纳米TiO2光催剂之间的相互作用机制。结果表明：TiO2为锐钛矿相,晶粒粒径为10.3nm,分布在磁性活性炭载体表面和孔道中；赋磁剂Fe3O4部分转化为FeO和γ-Fe2O3;磁性活性炭与TiO2在污染物降解时具有协同效应；赋磁剂形成的微磁场对光生电子和空穴的分离有促进作用；纳米TiO2/磁性活性炭光催化剂可以采用外磁场回收,循环使用。更多还原

【Abstract】 Firstly, using typical commercial activated carbons as support for titania, the load rule of titania on the activated carbons was studied and the result shows that activated carbon with moderate specific surface area and developed mesopores produced from brown coal is suitable for support of titania. Afterwards, a composite photocatalysit TiO2/MAC was prepared by sol-gel method with magnetic activated carbon as support, which produced from brown coal as material and ferriferrous oxide as bi-functional additive by steam activation method and then was characterized. Meanwhile, the photodegradation of TiO2/MAC was measured by phenol as model pollutant. Besides, the interactive mechanism between magnetic activated carbon and photocatalyst titania was discussed. The results show that TiO2 which is anatase phase, its grain size is 10.3 nm, was dispersed on the surface and in the pores of MAC. In the preparation process, ferroferric oxide partially transformed into ferrous oxide and ferric oxide (γ) was confirmed. There is a senergetic effect between TiO2 and magnetic activated carbon during the photodegradation of pollutant. Magnetic field originated from magnetization reagent could promote separation between photo genaration electron and hole. Furthermore, recycling photocatalyst TiO2/MAC could be recovered by external magnetic field.更多还原