添加Fe_3O_4对煤基活性炭孔结构的影响

Fe_3O_4 Added Affected to Pore Structure of Coal Based Activated Carbon

选用太西无烟煤为原料,以Fe3O4为添加剂制备出煤基活性炭,利用N2吸附等温线、碘值、亚甲基蓝值、X射线衍射分析仪(XRD)和扫描电子显微镜(SEM)对其进行表征。结果表明:添加质量分数6%的Fe3O4,煤基活性炭具有较大的比表面积,其值为993.5 m2/g,与未添加Fe3O4的活性炭比较,碘值提高了4%,亚甲基蓝值提高了42%;添加Fe3O4使活性炭的石墨微晶形成乱层结构,促进了微孔和中孔的发育;由于炭化过程中部分Fe3O4转化为α-Fe,因其在活化过程中起到催化作用,因此提高了活性炭中孔的数量。

Taking the Taixi anthracite as the raw material,the coal based activated carbon was prepared with Fe3O4 as the additive.The N2 adsorption isothermal curve,iodine value,methylene blue value,XRD and SEM were applied to characterize the activated carbon.The results showed that with the added quantity fraction 6% of Fe3O4 added,the specific surface area of the coal based activated carbon would be increased to 993.5 m2/g.In comparison with the coal based activated carbon with no Fe3O4 added,the iodine value would be increased by 4% and the methylene blue value would be increased by 42%.With the Fe3O4 added,the graphite crystallite of the coal based activated carbon would form the turbostratic structure and the development of the micro-pores and mesoporous would be promoted.Due to the partial Fe3O4 converted to α-Fe during the carbonization,thus the Fe3O4 would have the catalysis function during the activation process.Therefore,the number of the mesopore in the activated carbon would be improved.