To cite this article: A. Ghani, N. I. et al. (2017). Modification of activated carbon from biomass nypa and amine functional groups as carbon dioxide adsorbent. J. Phys. Sci., 28(Supp. 1), 227–240, https://doi.org/10.21315/jps2017.28.s1.15
The increase in carbon dioxide (CO2) has been a major cause for global warming and climate change. Therefore, a study of CO2 adsorption by using activated carbon (AC), which has sorption capacity, surface area, and pore structure, is introduced. AC is produced by using sulfuric acid by dehydration method with biomass nypa. Then, to enhance the selectivity of AC to adsorb CO2, characterisation and modification of AC are performed by using amine functional groups, diethanolamine (DEA) with 10%, 20% and 30%. The samples were characterised using BET, FTIR, XRD, and SEM. FTIR analysis found that peak areas of the 10%, 20%, and 30% DEA/AC samples are associated with stretching of the functional group OH. The presence of functional groups grows with the increase in the mass of the DEA. Meanwhile, XRD analysis indicated that the chemical composition of the results is carbon, and salts such as sodium sulfate were produced from the dehydration reaction. The AC samples have more surface pores than the DEA/AC samples; SEM analysis shows that the pore area of the DEA/AC samples is covered with amine compounds that accumulate in the pores of AC. Physical adsorption for the AC samples is higher in the BET surface area of 339.09 m2/g with average pores size of 1.1 nm. The DEA/AC samples showed a significant decrease in the surface area because DEA compounds dispersed and covered the surface and pores of AC. The performance of the adsorbent increases when the functional group increases after CO2 flow, as indicated by FTIR analysis. An analysis of CO2 adsorption showed that the AC samples have a higher CO2 adsorption of 38.37 cm3/g compared with the DEA/AC samples. Hence, the presence of AC with an amine functional group can increase the capacity for physical adsorption on the basis of the characterisation that was performed.