Preparation of porous composite materials with semi-coke based activated carbon doped with graphene oxide

In this paper, the waste semi-coke is used as the carbon precursor, doped with a certain amount of graphene oxide (GO), and activated by KOH to obtain graphene-doped activated carbon. The changes of morphology and structure were compared by SEM, the properties of specific surface area and pore structure were tested by nitrogen adsorption at low temperature, and the changes of iodine adsorption capacity of samples with different ratio were tested. Finally, the graphene-doped activated carbon with specific surface area of 1072.08 m2/g and iodine adsorption capacity of 1223.99 mg/g was obtained. The optimal ratio of semi-coke to graphene oxide was 300:1, KOH and the semi-coke ratio is 4:1, which provides an excellent adsorbent for the adsorption of methane and carbon dioxide.