新型炭材料2021，Vol.36Issue(6)：1081-1093,13.DOI:10.1016/S1872-5805(21)60074-4
壳聚糖水热炭低浓度KOH活化制备多孔炭材料及其CO2吸附性能
High-surface-area porous carbons produced by the mild KOH activa-tion of a chitosan hydrochar and their CO2 capture
摘要
Abstract
Hydrothermal treatment of biomass is effective in producing hydrochar, but the product usually has a low surface area and is not suitable for direct use as an adsorbent for CO2 capture. We report the use of chitosan as a precursor for carbon prepared by a combination of hydrothermal treatment and mild KOH activation. The effect of an additive salt (eutectic salt of KCl/LiCl with a mass ratio of 5.5/4.5) in the hydrothermal treatment and activation temperature on the porosities and surface chemical states of the obtained carbons and their CO2 capture were studied by N2 adsorption, XPS, SEM and XRD. Results indicated that the porosities of the carbons were increased by increasing the activation temperature. The salt additive introduced mesopores in the hydrochar and slightly reduced the surface area of the porous carbon after activation, but was useful in increasing the number of N-species during hydrothermal treatment and activation. The carbons produced using the salt additive had much larger CO2 uptakes under ambient conditions than those prepared without the salt, suggesting that porosity is not the only factor that determines the CO2 uptake. The CO2 uptake on the carbon activated by KOH at 600 ℃ produced from the salt-assisted hydrochar was the highest (as high as 4.41 mmol/g) although its surface area was only 1249 m2/g, indicating that CO2 uptake was determined by both the microporosity and the active N-species in the carbon.关键词
壳聚糖/多孔炭材料/水热炭化/KOH活化/二氧化碳吸附Key words
Chitosan/Porous carbon/Hydrothermal carbonization/KOH activation/CO2 capture分类
资源环境引用本文复制引用
王静,陈双,徐嘉宇,刘立成,周继承,蔡进军..壳聚糖水热炭低浓度KOH活化制备多孔炭材料及其CO2吸附性能[J].新型炭材料,2021,36(6):1081-1093,13.基金项目
The authors thank supports from National Nature Science Foundation of China(21506184 （）
21676227),Natural Science Foundation of Hunan Province(2021JJ30665 （）
2019JJ50597),Key Laboratory of Biobased Materials(BMF2020015),and 2011 Collab-orative Innovation Center of Chemical Process with Environmental Benignity&Efficient Resource Utiliz-ation of Hunan Province.国家自然科学基金(21506184 （BMF2020015）
21676227) （）
湖南省自然科学基金(2021JJ30665,2019JJ1863) （2021JJ30665,2019JJ1863）
中科院生物基材料重点实验室基金(BMF-2020-15) （BMF-2020-15）
"环境友好与资源高效利用化工新技术"湖南省2011协同创新中心资助项目. （）
