Preparation and characterisation of amino-functionalized pore-expanded mesoporous silica for carbon dioxide capture
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Preparation and characterisation of amino‑functionalized pore‑expanded mesoporous silica for carbon dioxide capture Alexandru Popa1 · Silvana Borcanescu1 · Ivanka Holclajtner‑Antunović2 · Danica Bajuk‑Bogdanović2 · Snežana Uskoković‑Marković3
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this study, the preparation of some large-pore ordered mesoporous silicas using a proper surfactant with different swelling agents was carried out. The synthesis of conventional SBA-15 was modified to obtain pore-expanded materials, with pore diameters up to 10 nm. To use a micelle swelling agent with a moderate swelling ability, three swelling agents were selected: 1-phenyl-decane (Dec), butyl benzene (BB), and mesitylene (Mes). These syntheses aimed to achieve a pore diameter enlargement but at the same time to avoid the formation of heterogeneous and/or poorly defined nanostructure of silica. The CO2 adsorbents were obtained by post-synthesis functionalization treatments carried out by grafting with 3-aminopropyl triethoxysilane. The CO2 adsorption/desorption experiments showed that carbon dioxide sorption capacities depend on the textural characteristics and the temperature used for the adsorption process. Good C O2 adsorption capacities were obtained for all prepared adsorbents, especially for SSBA-15-Mes-sil and SSBA-15-BB-sil samples. At 50 °C, the SSBA-15-Mes-sil sample has an adsorption capacity of 3.58 mmol C O2/g SiO2, and an efficiency of amino groups of 0.99 mmol CO2/mmol NH2. The results of adsorption capacities are comparable or even superior with the ones reported in literature for mesoporous silica functionalized with different amines. After nine adsorption–desorption cycles, the performance of the SSBA-15-Messil adsorbent is relatively stable, with a low decrease in the adsorption capacity (0.1 mmol/g of CO2, i.e., 2.8% of initial capacity). These studies show the potential of mesoporous silica for carbon dioxide capture. Keywords Functionalized materials · Swelling agent · Temperature influence · CO2 adsorption · Mass spectrometry
1 Introduction Nowadays it is well known that carbon dioxide has become an important global issue due to the significant and continuous rise of C O2 emission to the atmosphere and its connection with global climate change. Therefore, there is interest to reduce C O2 concentration from the current level by its capture and sequestration with different adsorption and absorption technologies. The main available approaches for carbon dioxide capture are (physical and chemical) * Danica Bajuk‑Bogdanović [email protected] 1
Institute of Chemistry, “Coriolan Dragulescu” Timişoara, Bl. Mihai Viteazul 24, 300223 Timisoara, Romania
2
Faculty of Physical Chemistry, University of Belgrade, P.O. Box 47, 11158 Belgrade, Serbia
3
Faculty of Pharmacy, University of Belgrade, P.O. Box 146, 11001 Belgrade, Serbia
adsorption, absorption, and membrane and cryogenic separations [1–5]. Chemical absorption with amine solution technologies
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