Abstract
The design and synthesis of new multifunctional organic porous polymers has attracted significant attention over the years due to their favorable properties, which make them suitable for carbon dioxide storage. In this study, 2-, 3-, and 4-hydroxybenzaldehyde reacted with phenyltrichlorosilane in the presence of a base, affording the corresponding organosilicons 1–3, which further reacted with benzidine in the presence of glacial acetic acid, yielding the organic polymers 4–6. The synthesized polymers exhibited microporous structures with a surface area of 8.174–18.012 m2 g−1, while their pore volume and total average pore diameter ranged from 0.015–0.035 cm3 g−1 and 1.947–1.952 nm, respectively. In addition, among the synthesized organic polymers, the one with the meta-arrangement structure 5 showed the highest carbon dioxide adsorption capacity at 323 K and 40 bar due to its relatively high surface area and pore volume.
Highlights
Fossil fuels are under pressure due to the constantly increasing energy demand in many industrial applications
Microscope (ZEISS Microscopy, Jena, Germany), while the X-ray powder diffraction (XRD) spectra were measured on an ADX-2500 X-ray diffraction instrument (Angstrom Advanced, Inc., Stoughton, MA, USA)
The CO2 uptake was estimated on an H-sorb 2600 high-pressure volumetric adsorption analyzer (Gold APP Instrument Corporation, Beijing, China) at
Summary
Fossil fuels are under pressure due to the constantly increasing energy demand in many industrial applications. Solid CO2 adsorbents are more beneficial in terms of energy efficiency compared to absorbents, as they can form van der Waals (physisorption) or covalent (chemisorption) bonds with CO2 [13] Porous materials, such as activated carbons, zeolites, molecular sieves, and metal oxides, are common CO2 physical adsorbents [14] and their properties can be modified by incorporating several functional groups [15]. MCM-41, produced from pulverized coal fly ash, has a large pore volume and acts as an excellent CO2 storage medium in the presence of amine [31] The implementation of both strategies allows full control of both the functionality and the porosity of the synthesized POPs. it has been reported that porous polymeric materials with tetrahedral geometry have a high surface area, porosity, rigidity, and gas adsorption capacity [32,33,34,35,36,37]. The estimation of the CO2 uptake by the three polymers revealed that their pore size distribution, surface area, and geometry could significantly affect their CO2 storage capacity
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