摘要
针对大气集水领域的水凝胶具有力学性能较差和水输送缓慢等缺点,以亲水纤维素纳米纤维(cellulose nanofibers,CNF)作为骨架增强聚N-异丙基丙烯酰胺(poly(N-isopropylacrylamide),PNIPAM)水凝胶的力学性能,并通过浸渍的方法引入氯化锂(LiCl)吸湿剂,制备PNIPAM/CNF@LiCl复合水凝胶。然后,通过静电纺丝将炭黑(carbon black,CB)纳米颗粒均匀嵌入聚丙烯腈(polyacrylonitrile,PAN)纳米纤维中,并将制备的PAN/CB纳米纤维膜作为PNIPAM/CNF@LiCl复合水凝胶的光热层,进一步构筑一体化水凝胶PNIPAM/CNF@LiCl-PAN/CB,利用PAN/CB纳米纤维膜优异的光热性能实现PNIPAM/CNF@LiCl-PAN/CB水凝胶的水汽脱附,从而完成大气水的收集。在温度为25℃、相对湿度为90%条件下,具有分级多孔结构和亲水纤维素纳米纤维的PNIPAM/CNF@LiCl-PAN/CB水凝胶的吸水率为0.71 g/g。制备的双层纳米纤维复合水凝胶力学性能优异,其水传输及大气水收集效率高,研究结果为从大气中收集清洁水提供了新思路。
In view of the disadvantages of inferior mechanical properties and slow water transport of hydrogels in the field of atmospheric water harvesting,hydrophilic cellulose nanofibers(CNF)were used as the framework to enhance the mechanical properties of poly(N-isopropylacrylamide)(PNIPAM)hydrogels.And the hygroscopic agent of lithium chloride(LiCl)was introduced through impregnation.Then,carbon black(CB)nanoparticles were uniformly embedded into the polyacrylonitrile(PAN)nanofibers by electrospinning,the prepared PAN/CB nanofiber membrane was used as a photothermal layer of PNIPAM/CNF@LiCl to further construct the integrated hydrogel PNIPAM/CNF@LiCl-PAN/CB.The excellent photothermal performance of PAN/CB nanofiber membrane contributes to the desorption of water to complete the collection of atmospheric water.The PNIPAM/CNF@LiCl-PAN/CB hydrogel with porous nanostructures and hydrophilic cellulose nanofibers possesses a high water absorption of 0.71 g/g at 25℃and 90%relative humidity.The double-layer nanofibrous composite hydrogels have excellent mechanical properties,high efficiency of water transport and atmospheric water collection,which provides a new idea for collecting clean water from the atmosphere.
作者
金赐
杨书康
戴俊
吴德群
李发学
高婷婷
JIN Ci;YANG Shukang;DAI Jun;WU Dequn;LI Faxue;GAO Tingting(College of Textiles,Donghua University,Shanghai 201620,China;Innovation Center for Textile Science and Technology,Donghua University,Shanghai 201620,China;Jiangsu Yueda Cotton Spinning Co.,Ltd.,Yancheng 224008,Jiangsu,China)
出处
《东华大学学报（自然科学版）》
CAS
北大核心
2023年第4期8-15,共8页
Journal of Donghua University(Natural Science)
基金
国家自然科学基金(52003045)
上海市现代纺织前沿科学研究基地项目
中央高校基本科研业务费专项资金项目(2232023G-01)。
关键词
淡水资源危机
大气集水
纳米纤维
水凝胶
静电纺丝
freshwater resource crisis
atmospheric water harvesting
nanofiber
hydrogel
electrospinning
作者简介
通信作者:高婷婷,女,讲师,研究方向为纳米复合纤维材料的结构设计与可控制备,E-mail:gaott@dhu.edu.cn。
