The slightly change of the absorption capacity for each cycle may be ascribed to the residual weight of organic liquid remained in C-1000 sample during incomplete combustion process. The results clearly suggest the excellent recyclability of the carbon monolith when used as a sorbent for oil–water separation. Table S1 shows the comparison of macro/mesoporous carbon monolith with several typical carbonbased sorbents reported before. Although the absorption capacity of the resultant macro/mesoporous carbon monolith is still lower than those of graphene sponge, carbon