淡水资源日益短缺,解决淡水需求问题刻不容缓。大气中水多以水蒸气与水滴的形式存在,若通过吸附剂将大气中的水收集,可以缓解水资源短缺。近年来,MOF-303因具有较高的比表面积、高孔隙率优点成为热门吸附剂,但MOF-303存在吸水量低等问题,若选取低成本的吸湿性盐与MOF-303复合,可解决MOF-303吸湿体量问题。因此向MOF-303中引入无机盐氯化钙(CaCl2),不仅增加了吸湿性能,同时有利于改善传统吸湿性盐易于泄漏的问题。通过水热法合成MOF-303,以MOF-303、氯化钙为原料制备出3种不同浓度的MOF-303/CaCl2复合材料,研究MOF-303及MOF-303/CaCl2复合材料的结构组成、外观形貌以及吸湿性能。结果表明:CaCl2的引入对复合材料的比表面积影响较大,同时MOF-303/CaCl2复合材料经过7h可吸附0.63g/g的水,相较于MOF-303吸湿性能有显著的提高。
With the increasing shortage of fresh water resources,it is urgent to solve the problem of fresh water demand.Water in the atmosphere mostly exists in the form of water vapor and water droplets.If the water in the atmosphere is collected through the adsorbent,the water shortage can be alleviated.In recent years,MOF-303 has become a popular adsorbent due to its advantages of high specific surface area and high porosity,but MOF-303 has low water absorption.If low-cost hygroscopic salt is combined with MOF-303,the application limitation of MOF-303 can be solved.Therefore,the introduction of inorganic salt calcium chloride (CaCl2) into MOF-303 not only increases the hygroscopic performance,but also mitigates the issue of traditional hygroscopic salt prone to leakage.MOF-303 was synthesized by hydrothermal method,and three MOF-303/CaCl2 composites with different concentrations were prepared from MOF-303 and calcium chloride,and the structure,appearance,morphology and hygroscopic properties of MOF-303 and MOF-303/CaCl2 composite materials were studied.The results showed that the introduction of CaCl2 had a great impact on the specific surface area of the composite materials,and the MOF-303/CaCl2 composite could adsorb 0.63g/g of water after 7h,which was a significant improvement in the hygroscopic performance compared with pure MOF-303.
[1] Elimelech M,Phillip W A.The future of seawater desalination:energy,technology,and the environment[J].Science,2011,333(6043):712-717.
[2] Kalmutzki M J,Diercks C S,Yaghi O M.Metal-organic frameworks for water harvesting from air[J].Advanced Materials,2018,30(37):e1704304.
[3] Rieth A J,Yang S,Wang E N,et al.Record atmospheric fresh water capture and heat transfer with a material operating at the water uptake reversibility limit[J].ACS Central Science,2017,3(6):668-672.
[4] Lapotin A,Kim H,Rao S R,et al.Adsorption-based atmospheric water harvesting:impact of material and component properties on system-level performance[J].Accounts of Chemical Research,2019,52(6):1588-1597.
[5] Park H,Haechler I,Schnoering G,et al.Enhanced atmospheric water harvesting with sunlight activated Sorption ratcheting[J].ACS Applied Materials & Interfaces,2022,14(1):2237-2245.
[6] Sleiti A K,Al-khawaja H,Al-khawaja H,et al.Harvesting water from air using adsorption material-prototype and experimental results[J].Separation and Purification Technology,2021,257:117921.
[7] 张晶,赵惠忠,张真真,等.CaCl2复合吸附剂在太阳能空气取水的吸附性能实验研究[J].应用化工,2022,51(2):395-400,405.
[8] Shan H,Li C,Chen Z,et al.Exceptional water production yield enabled by batch-processed portable water harvester in semi-arid climate[J].Nature Communication,2022,13(1):5406.
[9] Fan Y,Luo L,Souyri B.Review of solar sorption refrigeration technologies:development and applications[J].Renewable and Sustainable Energy Reviews,2007,11(8):1758-1775.
[10] Stitou D,Mazet N,Bonnissel M.Performance of a high temperature hydrate solid/gas sorption heat pump used as topping cycle for cascaded sorption chillers[J].Energy,2004,29(2):267-285.
[11] Furukawa H,Cordova K E,O'Keeffe M,et al.The chemistry and applications of metal-organic frameworks[J].Science,2013,341(6149):1230444.
[12] Hanikel N,Prevot M S,Fathieh F,et al.Rapid cycling and exceptional yield in a metal-organic framework water harvester[J].ACS Central Science,2019,5(10):1699-1706.
[13] Yu N,Wang R Z,Wang L W.Sorption thermal storage for solar energy[J].Progress in Energy and Combustion Science,2013,39(5):489-514.
[14] Aristov Y I.Optimal adsorbent for adsorptive heat transformers:dynamic considerations[J].International Journal of Refrigeration,2009,32(4):675-686.
[15] Wang Z Z,Li Z Y,Zhang X G,et al.Tailoring multiple sites of metal-organic frameworks for highly efficient and reversible ammonia adsorption[J].ACS Applied Materials & Interfaces,2021,13(47):56025-56034.
[16] Li M L,Wang X P,Zhang J,et al.Cu-loaded MOF-303 for iodine adsorption:the roles of Cu species and pyrazole ligands[J].Applied Surface Science,2023,619:156819.
[17] de lange M F,Verouden K J F M,Vlugt T J H,et al.Adsorption-driven heat pumps:the potential of metal-organic frameworks[J].Chemical Reviews,2015,115(22):12205-12250.
[18] Li Z Y,Shi K R,Zhai L,et al.Constructing multiple sites of metal-organic frameworks for efficient adsorption and selective separation of CO2[J].Separation and Purification Technology,2023,307:122725.
[19] Honicke I M,Senkovska I,Bon V,et al.Balancing mechanical stability and ultrahigh porosity in crystalline framework materials[J].Angewandte Chemie,2018,57(42):13780-13783.
[20] Frisch H L,Stern S A.Diffusion of small molecules in polymers[J].Critical Reviews in Solid State and Materials Sciences,2006,11(2):123-187.
基金资助
江苏省高等学校自然科学研究重大项目(24KJA540002);江苏省青年科技人才托举工程项目(JSTJ-2024-045);江苏省大学生创新创业训练计划项目(202410304123Y);扬州市科技计划项目(YZ2023002)
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