Preparation of N-doped activated carbons with high CO capture performance from microalgae ( sp.)

N-Doped activated carbons with high CO 2 adsorption capacity have been prepared from sugar-rich microalgae ( Chlorococcum sp.) feedstock via simple hydrothermal carbonization coupled with KOH activation or NH 3 modification. The KOH activated carbons exhibit higher CO 2 capture performance compared with the ones treated by NH 3 . The nitrogen-enriched hydro-char derived from microalgae was activated with KOH at 700 C to improve the textural characteristics (surface area, pores size, and total pore volume), and the resulting carbon showed a highly ordered structure with a surface area of 1745 m 2 g 1 , and narrow pore size distribution with the maxima peak located in the micropore range (