The priority of success in practical CO₂ capture with solid sorbents is dependent on the development of a low cost sorbent and energy consumption for regeneration with high adsorption capacity. In this work, different loading of NiO were evaluated as a potential source of basic sites for CO₂ capture, and activated carbon (AC) was used as a preliminary support in order to study the effect of the impregnation. The NiO loading increased the basicity of the adsorbent significantly enhance the CO₂ chemisorption. Nonetheless, it drastically reduced the surface area of the AC, which is chiefly responsible for CO₂ physisorption, thus decreasing the carrying capacity of ACs at room temperature and pressure.