title: Functionalized Polysilsesquioxane-Based Hybrid Silica Solid Amine Sorbents for the Regenerative Removal of CO2 from Air.
abstract: Functionalized polysilsesquioxane-based hybrid silica materials are presented as solid amine sorbents for direct CO2 capture from air. The sorbent was synthesized from amine and vinyl functionalized alkoxysilanes by a simple, energy efficient, and cost-effective co-condensation method. The material, containing bound amine functionalities, was found to have a selective CO2 capturing capacity of 1.68 mmol/g from atmospheric air with an adsorption half time of 50 min. This material also showed a maximum adsorption capacity of 2.28 mmol/g in pure CO2 and 1.92 mmol/g in 10% CO2. Desorption started at a temperature as low as 60 °C, and complete desorption occurred at 80 °C. The sorbent exhibited high recycling ability, and 100 cycles of adsorption/desorption were demonstrated in pure CO2 and 50 cycles in ambient air without any loss in efficiency.
authors.affiliation: Analytical and Spectroscopy Division, Analytical Spectroscopy and Ceramics Group, Propellants, Polymers, Chemicals and Materials Entity, Vikram Sarabhai Space Centre, Trivandrum 695022, Kerala, India.
authors.forename: Kochukunju Adisser Saraladevi
authors.initials: KA
authors.lastname: Abhilash
authors.affiliation: Analytical and Spectroscopy Division, Analytical Spectroscopy and Ceramics Group, Propellants, Polymers, Chemicals and Materials Entity, Vikram Sarabhai Space Centre, Trivandrum 695022, Kerala, India.
authors.forename: Thomas
authors.initials: T
authors.lastname: Deepthi
authors.affiliation: Analytical and Spectroscopy Division, Analytical Spectroscopy and Ceramics Group, Propellants, Polymers, Chemicals and Materials Entity, Vikram Sarabhai Space Centre, Trivandrum 695022, Kerala, India.
authors.forename: Retnakumari Amma
authors.initials: RA
authors.lastname: Sadhana
authors.affiliation: Analytical and Spectroscopy Division, Analytical Spectroscopy and Ceramics Group, Propellants, Polymers, Chemicals and Materials Entity, Vikram Sarabhai Space Centre, Trivandrum 695022, Kerala, India.
authors.forename: K George
authors.initials: KG
authors.lastname: Benny
keywords: CO2; adsorption; desorption; silanes; silsesquioxanes