Graphene-Mn3O4 (GMNO) hybrid porous material is prepared by a hydrothermal method and its performance in carbon dioxide adsorption is investigated.In the synthesis of the GMNO materials,MnO(OH)2 colloid obtained by the hydrolysis of Mn 2+ in basic solution was using as the precursor of the Mn3O4.After a hydrothermal reaction of the mixture of graphene oxide (GO) and MnO(OH)2,GO was reduced into graphene and the MnO(OH)2 was transformed into Mn3O4 with enhanced crystallization.X-ray diffraction,thermal gravimetric analysis,transmission electron microscopy,infrared spectra and Raman spectroscopy were taken to characterize the hybrid material.The porosity and the carbon dioxide adsorption ability are measured by gas sorption analysis,in which the as-prepared GMNO hybrid materials exhibit a specific surface area ranging from 140 to 680 m2g-1 and a maximum carbon dioxide capacity of about 11 wt%. Graphene-Mn3O4 (GMNO) hybrid porous material is prepared by a hydrothermal method and its performance in carbon dioxide adsorption is investigated. In the synthesis of the GMNO materials, MnO (OH) 2 colloid obtained by the hydrolysis of Mn 2+ in basic solution was used as the precursor of the Mn3O4.After a hydrothermal reaction of the mixture of graphene oxide (GO) and MnO (OH) 2, GO was reduced into graphene and the MnO (OH) 2 was transformed into Mn3O4 with enhanced crystallization. X -ray diffraction, thermal gravimetric analysis, transmission electron microscopy, infrared spectra and Raman spectroscopy were taken to characterize the hybrid material. The porosity and the carbon dioxide adsorption capacity are measured by gas sorption analysis, in which the as-prepared GMNO hybrid materials exhibit a specific surface area ranging from 140 to 680 m2g-1 and a maximum carbon dioxide capacity of about 11 wt%.