A series of MgO-based adsorbents were prepared through solution–combustion synthesis and ball-milling process.The prepared MgO-based powders were characterized using X-ray diffraction,scanning electron microscopy,N_2 physisorption measurements,and employed as potential adsorbents for CO_2 adsorption.The influence of structural and textural properties of these adsorbents over the CO_2 adsorption behaviour was also investigated.The results showed that MgO-based products prepared by solution–combustion and ball-milling processes,were highly porous,fluffy,nanocrystalline structures in nature,which are unique physico-chemical properties that significantly contribute to enhance their CO_2 adsorption.It was found that the MgO synthesized by solution combustion process,using a molar ratio of urea to magnesium nitrate(2:1),and treated by ball-milling during 2.5 hr(MgO-BM2.5h),exhibited the maximum CO_2 adsorption capacity of 1.611 mmol/g at 25℃ and 1 atm,mainly via chemisorption.The CO_2 adsorption behaviour on the MgO-based adsorbents was correlated to their improved specific surface area,total pore volume,pore size distribution and crystallinity.The reusability of synthesized MgO-BM2.5h was confirmed by five consecutive CO_2adsorption–desorption times,without any significant loss of performance,that supports the potential of MgO-based adsorbent.The results confirmed that the special features of MgO prepared by solution–combustion and treated by ball-milling during 2.5 hr are favorable to be used as effective MgO-based adsorbent in post-combustion CO_2 capture technologies. A series of MgO-based adsorbents were prepared through solution-combustion synthesis and ball-milling process. The prepared MgO-based powders were characterized using X-ray diffraction, scanning electron microscopy, N_2 physisorption measurements, and employed as potential adsorbents for CO_2 adsorption . The influence of structural and textural properties of these adsorbents over the CO_2 adsorption behavior was also investigated. The results showed that MgO-based products prepared by solution-combustion and ball-milling processes, were highly porous, fluffy, nanocrystalline structures in nature, which are unique physico-chemical properties that significantly contribute to enhance their CO 2 adsorption. It was found that the the MgO was synthesized by solution combustion process, using a molar ratio of urea to magnesium nitrate (2: 1), and treated by ball-milling during 2.5 hr (MgO-BM2.5h), exhibited the maximum CO_2 adsorption capacity of 1.611 mmol / g at 25 ℃ and 1 atm, mainly via chemisorption.The CO_2 adsorption behavior on the MgO-based adsorbents was correlated to their improved specific surface area, total pore volume, pore size distribution and crystallinity. reusability of synthesized MgO-BM2.5h was confirmed by five consecutive CO_2 adsorption-desorption times, without any significant loss of performance, that supports the potential of MgO-based adsorbent. the results confirmed that the special features of MgO prepared by solution-combustion and treated by ball-milling during 2.5 hr are favorable to be used as effective MgO-based adsorbent in post- combustion CO_2 capture technologies.