The amount of RhB adsorbed onto the four activated carbonswas in the following order: K-AC > PK-AC > P95-AC > P-AC (Fig. 2).This was consistent with the changing trend of BET surface area.Taking into account the cost of activated carbon, here, our workmainly focus on the investigation of PK-AC. It was noteworthy thatmost of pores in PK-AC were lager than 2 nm (Fig. 1b), which were0.0