N, S Co-doped porous carbons from coconut shell for selective CO2 adsorption
Journal of the Energy Institute, cilt.123, 2025 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 123
- Basım Tarihi: 2025
- Doi Numarası: 10.1016/j.joei.2025.102273
- Dergi Adı: Journal of the Energy Institute
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, Environment Index, INSPEC
- Anahtar Kelimeler: CO 2 adsorption, N/S co-doping, Microporosity, Biomass-derived carbon, Thiourea
- Boğaziçi Üniversitesi Adresli: Hayır
Özet
The CO2 capture from flue gas using biomass-derived porous carbons offers a promising and sustainable approach to mitigate greenhouse gas emissions. However, achieving high adsorption performance under ambient conditions requires synergistic optimization of pore architecture and surface chemistry. In the present work, a facile and scalable synthesis method was developed to prepare nitrogen and sulfur co-doped porous carbons using coconut shell as a renewable carbon precursor and thiourea as a dual heteroatom source. Chemical activation with KOH was employed to tune the porosity and surface functionality. The optimal adsorbent exhibited a high BET surface area (1315 m2/g), large narrow micropore volume (0.66 cm3/g), and significant heteroatom content (3.39 at.% N and 0.39 at.% S), resulting in superior CO2 uptake of 4.38 and 6.46 mmol/g at 25 °C and 0 °C, 1 bar, respectively. Additionally, as-prepared adsorbents demonstrated high CO2/N2 selectivity, rapid adsorption kinetics, moderate isosteric heat of adsorption, and excellent cycling stability over five adsorption–desorption cycles. These findings underscore the dual role of narrow micropores and heteroatom-rich functional groups in enhancing gas–solid interactions and provide a green and effective strategy for designing high-efficiency CO2 sorbents from coconut shell waste.