Greenhouse gas recovery performance of chitin-derived porous carbons from waste chitinous biomass

Abstract

This work upcycled waste chitin-based shells into porous carbons via a chemical-free steam activation route using only N₂ and water vapor, and investigated their adsorption/desorption behaviors toward the greenhouse gas n-butane. The textural and structural properties of chitin-based porous carbons (Ch-PCs) were characterized by N₂ adsorption-desorption, X-ray diffraction, and field-emission scanning electron microscopy. The n-butane working capacity (butane activity and retentivity) was also evaluated. The Ch-PCs exhibited specific surface areas of 720–1350 m²/g and total pore volumes of 0.53–1.10 cm³/g, with micropore volumes of 0.25–0.48 cm³/g and mesopore volumes of 0.28–0.62 cm³/g. As the activation time increased, the n-butane adsorption capacity increased from 22.3% to 43.6%, while the retentivity (residual adsorption) decreased from 16.9% to 9.2%. The n-butane adsorption/desorption behaviors were strongly correlated with the pore structure of the Ch-PCs. The adsorption capacity showed a strong relationship with the pore size of 1.0–3.0 nm, whereas the retentivity was mainly associated with the pore size of 3.0–5.0 nm. These findings demonstrated that steam-activated chitin-derived carbons, prepared from waste biomass by a chemical-free activation process, could serve as promising bio-based adsorbents for efficient greenhouse gas capture and recovery.

Keywords

Chitin-derived porous carbon / Steam activation / Pore structure development / Butane working capacity / Greenhouse gas recovery

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