现代纺织技术2025，Vol.33Issue(7)：32-38,7.DOI:10.12477∕j.att.202410013
LiCl@MOF基非织造材料的制备及其大气集水性能
Preparation of LiCl@MOF-based nonwoven materials and their properties of atmospheric water harvesting
摘要
Abstract
In response to the serious challenge of global water scarcity,researchers are dedicated to developing highly efficient air water harvesting materials that possess the capability to efficiently capture and release water molecules.Under this background,metal-organic frameworks(MOFs)have emerged as prominent candidates among various materials for air water harvesting due to their high specific surface area,high porosity,excellent adsorption properties,and low desorption temperature.However,MOF materials are mostly used in powder form,which presents issues such as easy agglomeration,difficulty in molding,and long desorption times.Given that viscose fiber nonwoven materials resemble traditional fabrics in appearance and exhibit high flexibility,strength,hygroscopicity,air permeability,and porosity,they have become ideal carriers in the field of air water harvesting.Therefore,this study prepares a highly hygroscopic material,LiCl@MOF powder,using MOF-303 and lithium chloride(LiCl)as the base materials.By leveraging the adhesive properties of polydopamine(PDA),a bond is established between LiCl@MOF and viscose fiber nonwoven materials to produce LiCl@MOF-based nonwoven materials. For the purpose of achieving multiple cycles in the adsorption-desorption process of LiCl@MOF-based nonwoven materials,researchers used interfacial evaporation technology and chose viscose fiber nonwoven materials with photothermal conversion properties as the carrier.This enabled LiCl@MOF-based nonwoven materials to achieve efficient capture and release of water vapor.At night,the LiCl@MOF-based nonwoven materials leveraged their high porosity and hydrophilicity to adsorb and immobilize water vapor from the environment;while at daytime,the photothermal desorption function of the LiCl@MOF-based nonwoven material was used to convert the absorbed sunlight into thermal energy,accelerating the desorption and liquefaction of the water vapor adsorbed at night.This composite material not only enhanced the adsorption performance for water vapor in the air but also provided flexibility and cuttability to the air water harvesting material. With the view of comprehensively evaluating the performance of LiCl@MOF-based nonwoven materials,tests were conducted on their morphology,crystal structure,composition,physical properties,and adsorption-desorption capabilities.The experimental results showed that LiCl@MOF was tightly adhered to the viscose fibers,and the crystal structure of MOF-303 was confirmed through XRD patterns.The physical property tests indicated that the wettability of the viscose fiber nonwoven material remained unchanged after being coupled with LiCl@MOF powder,while its mechanical properties,air permeability,and average pore size of the fibers decreased.Under dynamic conditions where the relative humidity(RH)increased from 30%to 95%,the water vapor adsorption capacity of the LiCl@MOF-based nonwoven material ranged from 0.3 to 5.06 g/g.Under static conditions at an RH of 90%,its water vapor adsorption capacity was 4.9 g/g.Meanwhile,when exposed to one sun intensity of irradiation,the material's temperature rapidly rose above 80℃,and desorption was completed within 20 minutes.After multiple adsorption-desorption cycles,its adsorption performance was stabilized at 4.9 g/g under static conditions,demonstrating its excellent cyclic stability.关键词
金属有机框架/氯化锂/纤维基非织造材料/界面蒸发/空气集水Key words
MOF/LiCl/fiber-based nonwoven materials/interfacial evaporation technology/air water harvesting分类
化学化工引用本文复制引用
郑银霞,赵慧如,沈霄,李大伟,刘庆生,李昊轩..LiCl@MOF基非织造材料的制备及其大气集水性能[J].现代纺织技术,2025,33(7):32-38,7.基金项目
国家自然科学基金项目(52203226) （52203226）
