چكيده به لاتين
Carbon dioxide most prevalent greenhouse gas usually formed via the combustion of fossil fuels, accumulates in the atmosphere, thus increase in the average global temperature and adverse effects of climatic change .Among different technologies, adsorption using solid sorbents is known as one of the most efficient and affordable process. In this study, porous materials including zeolites, metal–organic frameworks MOFs, carbon molecular sieves and porous silicas as adsorptive materials were used for CO2 capture. The structural order and textural properties of the synthesized adsorbents have been characterized by a variety of conventional techniques. Isotherm measurements CO2, N2 and CH4 were made for all samples at different temperatures using a volumetric apparatus. The FAU- and LTA-type zeolite, cation exchanged zeolites and composites of conducting polymers were prepared. Adsorption capacity of LiX/PANI-40 was 4.25 mmol g-1 that showed better adsorption capacity than of other synthesized zeolites in the study. Various amine functional groups have been studied for functionalization of the SBA-3 to enhance CO2 adsorption, in view of the high affinity and interaction between the amine groups and acidic gas. A significant enhancement in the carbon dioxide adsorption capacity was observed in the SBA-3 which modification by Pentaethylene hexamine (2.50 mmol g-1). Ordered mesoporous carbons CMK-1 and CMK-3 were synthesized by hydrothermal method. In order to obtain high CO2 adsorption capacity, modification porous carbon materials with polyaniline. CMK-3/PANI with 5.60 mmol g-1 exhibited higher CO2 capture capacity than CMK-1/PANI. A nanocomposite of multiwalled carbon nanotubes and the metal−organic framework MOF-199 has been synthesized. It was prepared by the incorporation of multiwalled carbon nanotubes into MOF-199. Both the capacity and selectivity for CO2 adsorption can be considerably improved by using piperazine to modify the surface of an MOF-199 and increased from 3.72 mmol g-1 to 6.90 mmol g-1. The MOF-derived porous carbon is prepared by direct carbonization of the MOF-199. Polyethyleneimine can be functionalized onto MOF-derived porous carbon for enhanced CO2 adsorption.
