膜科学与技术

电纺纳米纤维诱导LDH生长促进CO2分离

作者：李子恒，郑文姬，代岩，吴雪梅，阮雪华，王汉利，杨振东，贺高红

单位： 1.大连理工大学精细化工国家重点实验室，膜科学与技术研究开发中心，大连 116024； 2.大连理工大学盘锦产业技术研究院，盘锦 124221；3. 山东华夏神舟新材料有限公司，淄博 256401

关键词：静电纺丝；诱导；HPAN；LDH；CO2分离膜；混合基质膜

出版年,卷(期):页码： 2023,43(6):35-43

摘要：

先进的功能膜材料是实现高效膜分离的关键，要求兼顾选择性和渗透通量。层状双金属氢氧化物（LDH）表面存在丰富的-OH基团，对CO2具有较高吸附选择性。利用晶种外延生长策略（SES），通过溶剂热合成在电纺纤维载体上诱导生长LDH，并用聚乙二醇二丙烯酸酯（PEGDA）在纤维间隙间原位光聚合得到致密的PEO/HPAN-LDH MMM，用于CO2的高效分离。研究结果表明，沿纤维连续的低结晶LDH具有丰富的亲CO2基团提供连续亲和CO2的传递通路。通过增加LDH生长次数，提高LDH的担载量。性能最佳的PEO/HPAN-LDH-2 MMM的CO2渗透性能为132.1 Barrer，CO2/N2选择性高达99.4，相较于PEO/HPAN MMM，CO2渗透性能提升46.8%，CO2/N2选择性提升25.8%。

Advanced functional membranes are the core for achieving efficient membrane separation, requiring a balance of selectivity and permeability. Layered double hydroxides (LDH) have abundant -OH groups on the surface which exhibit high selectivity for CO2 adsorption. Using a crystal species epitaxy growth strategy (SES), LDH was induced to grow on electrospun fiber by solvothermal synthesis, and dense PEO/HPAN-LDH MMM was obtained by in situ photopolymerization of polyethylene glycol diacrylate (PEGDA) between fiber gaps for efficient CO2 separation. Continuous low-crystalline LDH along the fiber with abundant CO2-philic groups provides a continuous affinity for the CO2 transfer pathway. By increasing the growth times of LDH, the loading capacity of LDH is increased. The best performing PEO/HPAN-LDH-2 MMM has a CO2 permeation performance of 132.1 Barrer and a CO2/N2 selectivity of 99.4, which improves the CO2 permeation by 46.8% and CO2/N2 selectivity by 25.8% compared to PEO/HPAN MMM.

李子恒（2000-），男，河北邢台人，学士，研究方向为功能纳米材料及气体分离膜

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