O. EDOKPAYI

Carbon dioxide is one of the major greenhouse gas that causes global warming, it is emitted from the burning of fossil fuels in industries, power plant and vehicles. Greenhouse gases leads to increased global warming and affects the balance of the environment and pollution of the environment. Fossil fuels are the primary source of global energy which make up over 80% of consumption, the remaining 20% which is contributed by nuclear and renewable energy sources. (Holechek et al., 2022). Carbon
dioxide is the main product which is generated from combustion processes in most industries. The emission of CO2 has increased in decades. By 2021, approximately 47% of emissions were generated from electricity and heat and around 25% was from transportation (i.e. vehicles). Industries (e.g. chemicals, petrochemicals, iron and steel, aluminium, cement or paper) generates about 18% of the total CO2 emission was generated(Ochedi et al., 2020).

This study investigated the effectiveness of activated coconut shell as an adsorbent for carbon dioxide (CO₂) capture, with a specific emphasis on the influence of particle size and gas flow rate on the adsorption efficiency. Coconut shells were collected locally from Benin City, Nigeria, and subjected to carbonization at 400°C for one hour, followed by acid activation using 10% hydrochloric acid. The carbonized material was classified into four particle size fractions: >500 μm, 250-500 μm, 100-250 μm, and <100 μm.