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The adsorption process is a technology that is more efficient in CO2 adsorption. The adsorbent used must have adsorption capacity and high selectivity to CO2 adsorption. In this study, silica is used because it has sufficient surface area and pore size. In addition, the presence of silanol group on the surface of silica allows silica to be modified with other functional groups for certain applications. One of the interesting points is the modification of silanol groups with amine group, where the amine group is selective towards CO2. The succes of the adsorbent depends on the succesful modification of the amine group to the surface of the silica through the reaction of the hydroxyl group on the surface of the substrate and silane compounds. Amine compounds used as modifying agents are APTS (aminopropyltriethoxysilane). The method used to modify silca gel is post grafting. Biogas to be purified is made by mixing vegetable waste with cow dung as a starter source of methanogen. The methane gas content can be increased by reducing the amount of CO2 gas in biogas. Methane gas content in biogas made from vegetable waste is 78.5% while CO2 gas is 16%. The process of CO2 gas adsorption is done by passing the biogas on the silica adsorbent which has been modified with amine. This process lasts for 30 minutes. The results of the analysis with TGDTA and FTIR showed that the adsorption has been proceed. CO2 gas which is successfully adsorpted from biogas is 80% and this increase the level of CO2 gas which rises from 16% to 12.76%

Application of Amine Modified Silica Adsorbenes on CO2 Adsorption in Biogas