Soft-Pillared@Magadiite: influence of the interlayer space and amine type on CO₂ adsorption

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Layered silicates are adaptable materials for various applications.
• Research into layered silicate-based materials for CO2 adsorption is limited.
• Organosilane grafting enhances material properties for specific functions.

Purpose of the Study:

• To synthesize and characterize a novel adsorbent, Soft-Pillared@Magadiite, for CO2 capture.
• To investigate the CO2 adsorption performance of the synthesized material.
• To evaluate the regeneration characteristics and thermodynamic parameters of the adsorbent.

Main Methods:

• Synthesis of organo-magadiite followed by simultaneous grafting with (3-glycidyloxypropyl)trimethoxysilane (GPTS) and N1-(3-trimethoxysilylpropyl)diethylenetriamine (TMSPETA).
• Characterization using XRD, NMR, TGA/DTG, and CHN elemental analysis.
• CO2 adsorption evaluation via TGA, CO2-TPD, and DSC, with isotherm fitting using pseudo-second order, fractional order, and Avrami models.

Main Results:

• The synthesized Soft-Pillared@Magadiite exhibited an expanded interlayer space of 3.05 nm.
• Optimal CO2 adsorption occurred at 25 °C, with a capacity of 0.36 mmol g-1 and efficiency of 0.15 at 5 vol% CO2.
• CO2 desorption occurred below 90 °C, and thermodynamic parameters indicated low sensible heat and regeneration heat compared to aqueous MEA solution.

Conclusions:

• Soft-Pillared@Magadiite demonstrates significant potential as an effective adsorbent for CO2 capture.
• The material's expanded interlayer space and favorable regeneration characteristics make it a promising candidate for carbon capture technologies.
• The study highlights the efficacy of simultaneous grafting for enhancing adsorbent performance.