期刊
CHEMICAL ENGINEERING JOURNAL
卷 424, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130362
关键词
Low regeneration temperature; Thermo-responsive fibre; Hyperbranched; High amino density; CO2 capture
资金
- Guangxi Youth Natural Science Foundation [2018GXNSFBA281174]
- National Natural Science Foundation of China [31860193]
- Foundation of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control [2019KF12]
A novel thermo-responsive hyperbranched intelligent nanofibre-based adsorbent with high CO2 adsorption capacity and ultra-low regeneration temperature was designed through a liquid-solid phase one-step rapid conversion. The specialized and cooperative mechanism between amino, hydroxyl, and thermo-responsive groups of the adsorbent contributed to its high efficiency. High-efficiency diffusion kinetics and 99% conversion rate of the reactants were maintained during the process.
Thermo-responsive solid amine adsorbents are used for adsorption of CO2 in carbon capture and storage. They have a low temperature regeneration, but are incapable of high CO2 adsorption capacity because of the imbalance between the densities of the amino and thermo-responsive groups. Hence, a novel thermo-responsive hyperbranched intelligent nanofibre-based adsorbent was designed via cross-linking with a hyperbranched polyamine and a thermo-responsive intelligent nanofibre. The liquid-solid phase one-step rapid conversion used here balanced the high amino density (12.40 mmol g(-1)) with that of the synergistic groups (thermo-sensitive groups, 3.12 mmol g(-1), and hydroxyl groups, 4.35 mmol g(-1)) of the adsorbent. A high-efficiency diffusion kinetics was maintained, and the conversion rate of the reactants reached 99%. An in situ variable-temperature characterisation and density functional theory (DFT) analysis were performed. The adsorbent possessed high CO2 adsorption capacity (6.23 mmol g(-1)) and ultra-low regeneration temperature (60 degrees C), the lowest regeneration temperature reported in the literature to date. These were attributed to the specialized and cooperative mechanism between amino, hydroxyl, and thermo-responsive groups of the adsorbent.
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