サトウキビバガス由来活性炭の狭細孔制御による高効率CO2回収のための賦活戦略の最適化
Tailoring Activation Strategies to Engineer Narrow Microporosity in Sugarcane Bagasse-Derived Activated Carbon for Efficient CO2 Capture (原題)
Rupesh Kumar Singh, Himanshu Sharma, Vishal Agarwal, Raju Kumar Gupta
🤖 gxceed AI 要約
日本語
廃サトウキビバガスからZnCl2賦活により微細孔活性炭を合成し、直接賦活・予備炭化・水熱炭化の3経路を比較した。水熱炭化経路が比表面積2714 m2/g、微細孔率約85%を達成し、0℃で5.97 mmol/g、25℃で3.47 mmol/gのCO2吸着能を示した。狭細孔（<1 nm）が主要吸着サイトであり、温度上昇で有効細孔径が縮小し吸着量が低下することを明らかにした。
English
Microporous activated carbons were synthesized from waste sugarcane bagasse via ZnCl2 activation, comparing direct, pre-carbonized, and hydrothermal routes. The optimal hydrothermal-derived sample achieved 2714 m2/g surface area with ~85% micropores, adsorbing 5.97 mmol/g CO2 at 0°C and 3.47 mmol/g at 25°C (1 bar). Narrow micropores (<1 nm) dominate uptake, with effective pore width shrinking at higher temperature, explaining reduced capacity.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本はCCUSをGX推進の重点技術と位置づけ、発電・鉄鋼・セメント等の排出削減に活用を計画している。本研究成果は国産バイオマス廃棄物を活用した低コストCO2分離材の可能性を示し、国内CCUS実装やカーボンリサイクル政策に資する基礎的知見を提供する。
In the global GX context
As CCUS becomes central to net-zero pathways under ISSB/TCFD-aligned transition plans, low-cost biomass-derived sorbents can lower capture costs for hard-to-abate sectors. This work advances materials-level understanding of micropore engineering, relevant to global carbon capture deployment and industrial decarbonization strategies.
👥 読者別の含意
🔬研究者:バイオマス由来多孔質炭素の細孔設計とCO2吸着機構に関する定量的知見を提供する。
🏢実務担当者:廃棄物由来の低コストCO2分離材の候補として、CCUS設備の吸着材選定に参考となる。
🏛政策担当者:CCUS技術のコスト低減に寄与しうる基礎研究として、GX技術ロードマップの材料開発支援の根拠となりうる。
📄 Abstract（原文）
Abstract The continuous rise in atmospheric carbon dioxide (CO2) concentrations has emerged as a worldwide environmental concern, underscoring the urgent need for innovative capture technologies. Activated carbons derived from renewable biomass feedstocks offer a sustainable and low-cost route for developing efficient CO2 adsorbents. In this work, we report the synthesis of microporous activated carbons from waste sugarcane bagasse via ZnCl2-assisted activation, exploring three pathways: direct activation, precarbonization prior to activation, and hydrothermal carbonization followed by activation. Compared with conventional KOH activation, ZnCl2 enabled the development of well-defined microporosity at 600 °C, a substantially lower temperature than that typically required for KOH (800–900 °C). Systematic optimization of the synthesis conditions enabled precise tuning of the pore structure. The optimal sample obtained via hydrothermal carbonization–activation route exhibited a high specific surface area of 2714 m2/g, with micropores contributing about 85% of the total porosity. When evaluated for CO2 capture, the adsorbent showed CO2 adsorption capacities of 5.97 mmol/g at 0 °C and 3.47 mmol/g at 25 °C, both at 1 bar. Adsorption isotherms were best described by the Sips model, indicating heterogeneous surface interactions. Correlation analysis revealed that CO2 uptake is predominantly influenced by micropore characteristics, particularly the narrow micropore volume, which exhibited a strong linear relationship, with R2 > 0.9 at 0 °C. Further analysis of the temperature-dependent adsorption behavior revealed that narrow micropores (<1 nm) act as the dominant adsorption sites, with the effective pore width narrowing from 0.33–0.82 nm at 0 °C to 0.33–0.72 nm at 25 °C. This reduction in effective pore width with increasing temperature limits the number of accessible adsorption sites, accounting for the observed decline in CO2 uptake. Moderate isosteric heats of adsorption confirmed physisorption, enabling facile regeneration. Furthermore, the activated carbons exhibited high CO2 uptake over N2 and excellent cyclic stability, demonstrating strong potential as sustainable adsorbents for CO2 capture.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1021/acs.energyfuels.6c02245first seen 2026-09-10 04:44:52
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