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以大同烟煤为原料、Fe3O4作为添加剂,催化制备了煤基磁性活性炭(MCAC).利用氮气吸附等温线表征了MCAC的孔隙结构,并考察了其吸附性能(碘值、亚甲兰值)和磁学性能.结果表明,Fe3O4对MCAC孔隙的产生具有催化作用,有利于活性炭中孔的形成和发育.其中添加10%Fe3O4的MCAC中孔率高达76.0%.MCAC与普通活性炭(AC-0)相比,碘吸附值明显降低,而亚甲兰吸附值显著提高.添加7%Fe3O4的MCAC,其碘值降低了25.5%,亚甲兰值提高了79.9%.添加适量的Fe3O4制备的MCAC具有较高的比饱和磁化强度和磁导率.Fe3O4质量分数为4%和10%时,所得MCAC的比饱和磁化强度分别是AC-0的24.4倍和44.5倍.
The coal-based magnetic activated carbon (MCAC) was prepared by using Datong bituminous coal as raw material and Fe3O4 as additive, and the pore structure of MCAC was characterized by nitrogen adsorption isotherm. The adsorption properties (iodine value and methylene blue value) The results showed that Fe3O4 could catalyze the formation of MCAC pores and was favorable for the formation and development of pores in activated carbon, in which the MCAC mesoporosity of 10% Fe3O4 was as high as 76.0% .MCAC reacted with common activated carbon (AC-0) , The iodine adsorption decreased significantly, while the adsorption of methylene blue increased significantly.The addition of 7% Fe3O4 MCAC reduced the iodine value by 25.5% and the methylene blue value by 79.9% High specific saturation magnetization and permeability.The specific saturation magnetization of the obtained MCAC was 24.4 times and 44.5 times that of AC-0 when the mass fraction of Fe3O4 was 4% and 10%, respectively.