In this paper, the MgO/C composite was successfully prepared by using KOH activated cyanobacteria powder as carbon source and magnesium nitrate hexahydrate as magnesium source through simple grinding solid reaction. The struc-ture of mesoporous MgO/C composite was explored by comparing the feeding of magnesium source and carbon source. At the same time, X-ray diffraction, N2 isothermal adsorption and desorption curve, scanning electron microscopy, infrared spec-troscopy, Raman spectroscopy and other modern techniques were used to characterize the structure of the composite. The re-sults showed that the MgO/C composite exhibited mesoporous structure, and the specific surface and pore volume of the composite decreased with the increase of MgO/ load content. The study of CO2 isothermal adsorption performance showed that the CO2 adsorption capacity was obviously improved after the combination of MgO and carbon, and the pore structure of the sampleaffected on the CO2 adsorption capacity.
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