Template-free amine-bridged silsesquioxane with dangling amino groups and its CO2 adsorption performance

Dang Viet Quang, Abdallah Dindi, Khalid Al-Ali, Mohammad Abu Zahra

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

In this study, amine-bridged silsesquioxane (ABS) and ABS with dangling amino groups were synthesized by a facile method, without using any structure directing agents, and tested for CO2 adsorption. The covalent attachment of dangling aminopropyl groups into ABS improves CO2 adsorption significantly; CO2 loading at 30 °C increases from 83.7 to 129.6 mg g−1 by adding 3-aminopropyltriethoxysilane (APTES) to bis[3-(trimethoxysilyl)propyl]amine (BTMSPA) precursor at a molar ratio of APTES/BTMSPA = 0.5. The properties of CO2 adsorbent can be controlled by the solvent water content and aging conditions. The water content of 25 wt% produces optimal solvent conditions for a resulting adsorbent with the highest surface area (333 m2 g−1), pore volume (0.3 cm3 g−1), and CO2 loading (132 mg g−1 at 30 °C) with an aging time is 48 h in the same solvent at 60 °C. Aging in water has more effect on structural transition than ethanol; adsorbent possesses the highest pore volume (0.85 cm3 g−1) and largest pore size (15.5 nm) when it was aged in water but it has the largest surface area (447 m2 g−1) when it was aged in ethanol. Aging in ethanol results in the best sorbent with the high CO2 loading and stable CO2 adsorption activity. An adsorbent aged for 144 h in ethanol shows excellent CO2 adsorption performance in a packed bed reactor; it was relatively stable after 50 adsorption/desorption cycles with a CO2 loading capacity of 144.6 mg g−1. The success of this research offers a novel route for synthesize of ABS with minimized waste, while maintaining the quality of produced adsorbent.

Original languageBritish English
Pages (from-to)23690-23702
Number of pages13
JournalJournal of Materials Chemistry A
Volume6
Issue number46
DOIs
StatePublished - 2018

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