A review of CO₂ capture by absorption and adsorption Global warming caused by greenhouse gas emissions, especially CO₂, has become a major concern. Chemical absorption and adsorption are currently considered the most suitable technologies for post-combustion power plants. The operation of chemical absorption is reviewed, along with the use of absorbents such as ionic liquids, alkanolamines, and their aqueous solutions. Key concerns include CO₂ capture efficiency, absorption rate, energy required for regeneration, and absorber volume. For adsorption, various mesoporous solid adsorbents impregnated with polyamines and grafted with aminosilanes are reviewed. Key concerns for adsorbent selection include cost, adsorption rate, CO₂ adsorption capacity, and thermal stability. More effective and less energy-consuming regeneration techniques for CO₂-loaded adsorbents are proposed. Future works for both absorption and adsorption are suggested. Keywords: CO₂ capture; Absorption; Rotating packed bed; Adsorption; Amine-based adsorbents. Global warming from greenhouse gas emissions has received widespread attention. CO₂ contributes more than 60% to global warming due to its high emission levels. The current CO₂ concentration is close to 400 ppm, significantly higher than the pre-industrial level of about 300 ppm. The Kyoto Protocol urges industrialized nations and the European Union to reduce greenhouse gas emissions by 5.2% on average below 1990 levels from 2008 to 2012. The Copenhagen Accord requests global temperature increase to be limited to 2°C above pre-industrial levels by 2100. The International Energy Agency (IEA) states that CO₂ capture and storage (CCS) technology is required to achieve the 2°C goal, contributing 19% in 2050. It is essential to develop CCS technologies to meet global CO₂ reduction demands. Various CO₂ capture technologies, including physical absorption, chemical absorption, adsorption, and membrane, exist but are not mature for post-combustion power plants. Chemical absorption using aqueous alkanolamine solutions is proposed as the most applicable technology for CO₂ capture before 2030. However, alkanolamine solutions have drawbacks such as high equipment corrosion rate, high energy consumption in regeneration, and large absorber volume. Solid adsorption processes are suggested to overcome these issues. Impregnation or grafting of amines is proposed to enhance adsorption capacity and promote CO₂ mass transfer into porous adsorbents. The objectives of this paper are to review technologies including chemical absorption and mesoporous adsorbents impregnated or grafted with amines for CO₂ capture in post-combustion power plants and regeneration processes concerning energy consumption. A schematic flow diagram is also depicted to demonstrate CO₂ capture by absorption and adsorption. Physical absorption isA review of CO₂ capture by absorption and adsorption Global warming caused by greenhouse gas emissions, especially CO₂, has become a major concern. Chemical absorption and adsorption are currently considered the most suitable technologies for post-combustion power plants. The operation of chemical absorption is reviewed, along with the use of absorbents such as ionic liquids, alkanolamines, and their aqueous solutions. Key concerns include CO₂ capture efficiency, absorption rate, energy required for regeneration, and absorber volume. For adsorption, various mesoporous solid adsorbents impregnated with polyamines and grafted with aminosilanes are reviewed. Key concerns for adsorbent selection include cost, adsorption rate, CO₂ adsorption capacity, and thermal stability. More effective and less energy-consuming regeneration techniques for CO₂-loaded adsorbents are proposed. Future works for both absorption and adsorption are suggested. Keywords: CO₂ capture; Absorption; Rotating packed bed; Adsorption; Amine-based adsorbents. Global warming from greenhouse gas emissions has received widespread attention. CO₂ contributes more than 60% to global warming due to its high emission levels. The current CO₂ concentration is close to 400 ppm, significantly higher than the pre-industrial level of about 300 ppm. The Kyoto Protocol urges industrialized nations and the European Union to reduce greenhouse gas emissions by 5.2% on average below 1990 levels from 2008 to 2012. The Copenhagen Accord requests global temperature increase to be limited to 2°C above pre-industrial levels by 2100. The International Energy Agency (IEA) states that CO₂ capture and storage (CCS) technology is required to achieve the 2°C goal, contributing 19% in 2050. It is essential to develop CCS technologies to meet global CO₂ reduction demands. Various CO₂ capture technologies, including physical absorption, chemical absorption, adsorption, and membrane, exist but are not mature for post-combustion power plants. Chemical absorption using aqueous alkanolamine solutions is proposed as the most applicable technology for CO₂ capture before 2030. However, alkanolamine solutions have drawbacks such as high equipment corrosion rate, high energy consumption in regeneration, and large absorber volume. Solid adsorption processes are suggested to overcome these issues. Impregnation or grafting of amines is proposed to enhance adsorption capacity and promote CO₂ mass transfer into porous adsorbents. The objectives of this paper are to review technologies including chemical absorption and mesoporous adsorbents impregnated or grafted with amines for CO₂ capture in post-combustion power plants and regeneration processes concerning energy consumption. A schematic flow diagram is also depicted to demonstrate CO₂ capture by absorption and adsorption. Physical absorption is