Abstract
The design of effective CO2 capture materials is a current challenge. Here, we report the synthesis of aminosilanes-functionalized MCM-41 and SBA-15 materials with high efficiency toward carbon dioxide adsorption. The functionalization of the mesoporous silicas involves a post-synthesis method by impregnation with 3-aminopropyltriethoxysilane. The carbon dioxide adsorption capacities for the samples were carried out under ambient pressures. The results evidenced that aminosilanes with a terminal amine were functionalized through covalent coupling of this group onto the channels' surface in the ordered mesoporous silica. It means that the amine is anchored on the surface of the largest pores of the MCM-41 and SBA-15 supports. The Lagergren kinetic model evidenced the enhanced carbon dioxide adsorption capacity and stability of the functionalized ordered mesoporous molecular sieves.
Highlights
The increase in atmospheric carbon dioxide concentration is becoming a serious environmental problem
The results demonstrated that chemical functionalization had a positive effect on the sorption capacity of the nanostructured materials
Synthesis and functionalization of mesoporous materials According to studies published elsewhere, ordered mesoporous molecular sieves MCM-41 and SBA-15 were synthesized by a hydrothermal method [16, 17]
Summary
The increase in atmospheric carbon dioxide concentration is becoming a serious environmental problem. It is well-known that the primary human activity that emits CO2 is the combustion of fossil fuels (coal, natural gas, and oil) for energy and transportation. In the transition toward a more sustainable energy economy, fossil fuels are likely to remain the primary source of global energy supply for the future [1, 2]. The continuous use of fossil fuels is dependent on the reduction of CO2 emissions. Improving energy utilization efficiency and increasing the use of low-carbon energy sources are potential ways to reduce CO2 emissions. Carbon capture and storage techniques have been proposed as an emerging technology to minimize CO2 emissions effectively [3]
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