魔芋葡甘聚糖/纤维素纳米纤维复合气凝胶负载 HKUST-1 用于 CO 吸附。
Konjac glucomannan/cellulose nanofibers composite aerogel supported HKUST-1 for CO adsorption.
机构信息
Shandong Key Laboratory for Special Silicon-containing Material, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, PR China.
Laboratory of Hydrogen Energy, Institute of Heat and Mass Transfer of the National Academy of Sciences of Belarus, Minsk 220072, Belarus.
出版信息
Carbohydr Polym. 2022 Oct 1;293:119720. doi: 10.1016/j.carbpol.2022.119720. Epub 2022 Jun 9.
Biomass aerogels are attractive in various applications owing to their inherent advantages of renewability, biodegradability and eco-friendly. Herein, a novel composite aerogel of konjac glucomannan (KGM)/TEMPO-oxidized cellulose nanofibers (TOCNF)@HKUST-1 (KTA@HKUST-1) is prepared through a facile vacuum impregnation method combined with the directional freeze-drying process, which using KGM and TOCNF as raw materials. The structural analyses disclose that the KTA@HKUST-1 has a hierarchical porosity, in which HKUST-1 can provide micropores for adsorption, while the meso-/macropores from KTA act as high-speed channels to improve diffusion and mass transfer rate to transport CO components into the micropores of HKUST-1. The experiment results of KTA@HKUST-1-10 (KTA@H10) show that the CO adsorption capacity can reach 3.50 mmol·g at 1 bar and 298 K, and the adsorption capacity retention rate as high as 91.43% after 7 cycles. In addition, the CO/N adsorption selectivity of KTA@H10 can reach 18.42, which has an excellent potential for selective CO adsorption.
生物质气凝胶由于其可再生性、生物降解性和环境友好性等固有优势，在各种应用中具有吸引力。在此，通过简便的真空浸渍法结合定向冷冻干燥工艺，以魔芋葡甘聚糖（KGM）和 TEMPO 氧化的纤维素纳米纤维（TOCNF）为原料，制备了一种新型的 KGM/TOCNF@HKUST-1（KTA@HKUST-1）复合气凝胶。结构分析表明，KTA@HKUST-1 具有分级多孔结构，其中 HKUST-1 可为吸附提供微孔，而 KTA 的中孔/大孔作为高速通道，以提高扩散和传质速率，将 CO 组分输送到 HKUST-1 的微孔中。实验结果表明，KTA@HKUST-1-10（KTA@H10）在 1 bar 和 298 K 下的 CO 吸附量可达 3.50 mmol·g，7 次循环后的吸附容量保持率高达 91.43%。此外，KTA@H10 的 CO/N 吸附选择性可达 18.42，对 CO 具有优异的选择性吸附潜力。
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