A one-pot synthetic method was used for the preparation of nanoporous carbon containing nitrogen from polypyrrole (PPY) using NaOH as the activated agent. The activation process was carried out under set conditions (NaOH/PPY = 2 and NaOH/PPY = 4) at different temperatures in 600-900 degrees C for 2 h. The effect of the activation conditions on the pore structure, surface functional groups and CO2 adsorption capacities of the prepared N-doped activated carbons was examined. The carbon was analyzed by X-ray photoelectron spectroscopy (XPS), N2/77 K full isotherms, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The CO2 adsorption capacity of the N-doped activated carbon was measured at 298 K and 1 bar. By dissolving the activation agents, the N-doped activated carbon exhibited high specific surface areas (755-2169 m(2) g(-1)) and high pore volumes (0.394-1.591 cm(3) g(-1)). In addition, the N-doped activated carbons contained a high N content at lower activation temperatures (7.05 wt.%). The N-doped activated carbons showed a very high CO2 adsorption capacity of 177 mg g(-1) at 298 K and 1 bar. The CO2 adsorption capacity was found to be dependent on the microporosity and N contents. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.