一种具有大气集水效应的吸湿性Alg-PEO-PNIPAM/CaCl2核壳纤维  

Alg-PEO-PNIPAM/CaCl2 Core-Shell Fiber with Hygroscopicity of AtmosphericWater Collection Effect

作　　者：杨灿星 宋梦梦 李敬[1] 王佳欣 曾敏峰 李帮经[2] 张晟[1] Canxing Yang;Mengmeng Song;Jing Li;JiaxinWang;Minfeng Zeng;Bangjing Li;Sheng Zhang(State Key Laboratory of Polymer Materials Engineering,Polymer Research Institute of Sichuan University,Sichuan University,Chengdu 610065,China;Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610041,China)

机构地区：[1]四川大学高分子材料研究所高分子材料工程国家重点实验室,四川成都610065 [2]中国科学院成都生物研究所山地生态恢复与生物资源利用重点实验室,四川成都610041

出　　处：《高分子材料科学与工程》2024年第9期136-147,共12页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(22277119,52273107)。

摘　　要：大气集水是在缺水地区提取清洁水的一种有效方法,但大多数大气集水器需要高额的能量来释放吸收的水,提高大气集水器的吸湿能力和解吸效率仍具有挑战性。受清洁太阳能的启发设计了一种具有核壳结构的超吸湿性纤维,能够在高湿度环境中(90%RH)自发吸收大气中的水,并通过太阳能转换为热能促使纤维释放吸收的水分。核壳层可与吸湿盐氯化钙发生离子交换和螯合2种不同的分子作用,进而负载更多的吸湿盐,吸水量最高能达到3.23 g/g。在模拟太阳光的驱动下,太阳-热能转换效应触发了聚(N-异丙基丙烯酰胺)(PNIPAM)的亲水-疏水构象转变,这与PNIPAM收缩导致的对核层纤维的物理挤压协同作用,可有效地释放出吸收的水分,水释放率高达到96%。大气水的自发收集和太阳能驱动的水释放相结合,使超吸湿性核壳纤维在大气集水领域有深远的应用前景。The extraction of clean water in water-scarce areas through atmospheric water harvesting is an effective approach.However,most existing devices require substantial energy input for releasing the absorbed water.Enhancing the hygroscopic capacity and desorption efficiency of atmospheric water collectors remains a challenging task.Taking inspiration from clean solar energy,a kind of superhygroscopic fiber with core-shell structure was developed,which can spontaneously absorb atmospheric water in high humidity environment(90%RH)and release water by converting solar energy into heat energy.These core-shell fibers load a large amount of CaCl2 through leveraging ion exchange and chelation interactions,resulting high water absorption capability.The maximum water absorption capacity of core-shell fiber membrane reaches 3.23 g/g.Under simulated sunlight,the solar-thermal conversion effect triggers the hydrophilic-to-hydrophobic conformation transition of poly(N isopropylacrylamide)(PNIPAM),which synergistically works with physical squeezing of the nuclear fiber accompanied by PNIPAM contraction to effectively release absorbed water at a rate as high as 96%.This combination of spontaneous collection and solar-driven release makes this superhygroscopic core-shell fiber membrane have high promising for applications in atmospheric water harvesting.

关 键 词：核壳纤维 大气集水 氯化钙 太阳能驱动 吸附 解吸 

分 类 号：TQ342[化学工程—化纤工业]