Valorization of agro-waste into high-performance porous carbons for tetrafluoromethane adsorption
Carbon, cilt.250, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 250
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.carbon.2026.121274
- Dergi Adı: Carbon
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, INSPEC
- Anahtar Kelimeler: Porous carbons, Biomass material, KOH activation, CF4 adsorption
- Boğaziçi Üniversitesi Adresli: Evet
Özet
The persistent emission of carbon tetrafluoride (CF4), a potent greenhouse gas with a >50,000-year lifetime and ∼6630 global warming potential, poses a serious challenge to climate mitigation. Conventional abatement techniques such as thermal and plasma decomposition are energy-intensive and ineffective for dilute CF4 streams, making adsorption on porous carbons a more promising and sustainable alternative. In this study, hazelnut shell, an abundant agricultural waste, was employed as a carbon precursor to synthesize porous carbons via pre-carbonization followed by KOH activation under varying activation temperatures and KOH ratios. Comprehensive characterization revealed that the optimized adsorbent possessed a high BET surface area (1625 m2 g−1), a large narrow micropore volume (0.72 cm3 g−1), and a carbon-rich surface chemistry. These attributes resulted in superior CF4 adsorption capacities of 2.50 mmol g−1 at 25 °C and 3.61 mmol g−1 at 0 °C under 1 bar, along with fast adsorption kinetics (90 % uptake within 5 min), excellent CF4/N2 selectivity (∼9), and outstanding cyclic stability (>97 % capacity retention after twenty cycles). These findings demonstrate that biomass-derived porous carbons with well-tailored microporous architectures can efficiently capture CF4 under mild conditions, providing a cost-effective and environmentally sustainable strategy for mitigating emissions of this long-lived greenhouse gas.