| 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 (?) 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. |
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