Uncarbonized crosslinked PVA-modified MMT/reduced graphene hybrid aerogel for efficient carbon dioxide adsorption at low pressure

• Published in: Journal of polymer research 2021-08, Vol.28 (8), Article 280
• Main Authors: Stanly, Sona, John, Honey
• Format: Article
• Language: English
• Subjects: Adsorption; Aerogels; Carbon dioxide; Carbon sequestration; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Clay; Efficiency; Fillers; Graphene; Industrial Chemistry/Chemical Engineering; Low pressure; Montmorillonite; Original Paper; Polymer Sciences; Polyvinyl alcohol; Synthesis
• ISSN: 1022-9760; 1572-8935
• DOI: 10.1007/s10965-021-02614-x

Graphene-based polymer aerogels are one of the important solutions for the adsorption of CO 2 . In the present study, we have developed an economic, uncarbonized polyvinyl alcohol (PVA) based aerogel through the freeze-drying method using modified clay- reduced graphene oxide (rGO) hybrid as filler. The CO 2 capture efficiency of PVA-modified clay/rGO aerogel containing the hybrid filler in three different concentrations such as 0.1 w/v%, 0.5 w/v% and 1 w/v% at 25 °C and comparatively low pressure ranging from 0 to 900 mmHg was studied. The polyphosphoric acid (PPA) modified montmorillonite (PMMT)/rGO hybrid was synthesized by the hydrothermal method by varying the ratio of the individual components in 2:1 and 1:2 ratios and compared with a 1:1 ratio hybrid. The powdered hybrids were characterized and analyzed for CO 2 adsorption analysis. All the powdered hybrids were showing good CO 2 gas adsorption efficiency and the efficiency was increased with an increase in rGO content and hybrid with 1:2 ratio showed a CO 2 adsorption efficiency of 0.53 mmol g −1 . PVA aerogel was synthesized using 1:1 and 1:2 PMMT/rGO hybrids and CO 2 adsorption capacity were analyzed. PVA-PMMT/rGO aerogel of 1:2 ratio with 0.5 w/v% showed only 0.176 mmol g −1 whereas PVA-PMMT/rGO aerogel of 1:1 ratio with 0.5 w/v% showed an excellent CO 2 adsorption capacity of 0.238 mmol g −1 at 900 mmHg at 25 °C temperature and it is significantly high when compared with the literature results. The developed PVA-PMMT/rGO hybrid aerogel is an excellent material for CO 2 adsorption and it can be directly used for reducing the CO 2 level in the atmosphere.