thus confirming the typical characteristics of porous activated carbon, which rapidly increase at a lower relative pressure. The first adsorption curve at relative pressures P/P0 < 0.01 indicates the filling of micropores, and the steepness of second adsorption curve at 0.3 < P/P0 < 0.4 was due to mesopores having a narrow distribution. The final condensation curve of P/P0 > 0.8 was related to the presence of intercrystalline mesopores. Note that the pore size distribution is also shown in Fig