CF<inf>4</inf> is a gas with high global warming potential and has an extremely long atmospheric lifetime. This study developed a method for capturing CF<inf>4</inf> gas via adsorption using microporous carbons. Microporous carbon adsorbents were synthesized by a facile protocol involving carbonization of poly(vinylidene fluoride) (PVDF) at high temperatures (400-800 °C) without additional activation, and the effects of carbonization on the characteristics and CF<inf>4</inf> adsorption of PVDF-based adsorbents were investigated. Increasing the carbonization temperature enhanced the textural properties of the adsorbent, resulting in the increased CF<inf>4</inf> adsorption capacity. Above 700 °C, PVDF was fully dehydrofluorinated, and the microporous carbon synthesized at 800 °C exhibited superior textural properties with a maximum CF<inf>4</inf> adsorption capacity of 1.85 mol/kg at 25 °C under atmospheric pressure. The PVDF-based microporous carbons also exhibited fast adsorption-desorption kinetics, excellent cyclic stability, and good selectivity for CF<inf>4</inf> over N<inf>2</inf> at relatively low CF<inf>4</inf> pressures. The microporous carbons developed in this study have potential for use as novel adsorbents for CF<inf>4</inf> capture.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering