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浙江大学学报(工学版)  2022, Vol. 56 Issue (1): 186-192    DOI: 10.3785/j.issn.1008-973X.2022.01.021
材料工程     
铝基金属-有机框架材料的水吸附性能与大气集水应用
武恩宇(),钱国栋,李斌*()
浙江大学 材料科学与工程学院, 浙江 杭州 310027
Water adsorption in aluminum-based metal-organic framework for atmospheric water harvesting
En-yu WU(),Guo-dong QIAN,Bin LI*()
School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
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摘要:

为了从大气中高效收集水蒸气,采用简单绿色的水热法制备具有高稳定性的铝基金属-有机框架材料(MOF)ZJU-210. 采用粉末X射线衍射技术进行晶体结构分析,利用同步热分析仪测试样品的稳定性和吸附-脱附动力学,利用气体与蒸汽吸附仪分析样品的孔结构和水吸附性能. 分析结果显示,ZJU-210延c轴形成一维方孔道,孔道直径约为0.58 nm. ZJU-210的孔道内拥有丰富的氮位点和氧位点,增强了材料孔道的亲水性,使ZJU-210在20%相对湿度下(25 ℃)水质量分数高达40%,能够在极短的时间内完成吸附-脱附循环. ZJU-210具有良好的稳定性,经历1 000次水吸附-脱附循环后能够保持初始的吸水性能. 室外实验证明ZJU-210能通过太阳光完成快速脱附. 与传统干燥剂(如硅胶、沸石和吸湿盐)相比,ZJU-210具有许多优点,有望成为新一代大气集水材料.

关键词: 多孔材料金属-有机框架材料大气集水水稳定性等温水吸附曲线    
Abstract:

A simple and green hydrothermal method was used to prepare an aluminum-based metal-organic framework (MOF) ZJU-210 with high stability in order to efficiently collect water from the atmosphere. The powder X-ray diffraction was used to analyze the crystal structure, and the thermogravimetric analyzer was used to test the stability and adsorption-desorption kinetics. The gas and vapor adsorption analyzer was used to analyze the pore structure and water adsorption performance. The analysis results show that ZJU-210 has a one-dimensional square channel along the c axis with a pore size of about 0.58 nm. The channel has abundant nitrogen and oxygen sites, which greatly enhances the hydrophilicity of channel. Water mass fraction reached 40% at a relative humidity of 20% (25 ℃) and a fast adsorption-desorption cycle was achieved. ZJU-210 is reusable and can still maintain its initial water adsorption performance after 1 000 water adsorption-desorption cycles. Out-door experiment shows the fast water release powered by natural sunlight. ZJU-210 was testified to have many advantages compared with classic desiccants (such as silica gel, zeolite, and hygroscopic salts), providing a promising strategy for developing next-generation hydrophilic material for atmosphere water harvesting.

Key words: porous material    metal-organic framework    atmospheric water harvesting    hydrolytic stability    water adsorption isotherm
收稿日期: 2021-07-28 出版日期: 2022-01-05
CLC:  O 61  
基金资助: 国家自然科学基金资助项目(51803179)
通讯作者: 李斌     E-mail: 2196090@zju.edu.cn;bin.li@zju.edu.cn
作者简介: 武恩宇(1997—),男,硕士生,从事铝基金属-有机框架材料的研究. orcid.org/0000-0003-2973-4107. E-mail: 2196090@zju.edu.cn
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引用本文:

武恩宇,钱国栋,李斌. 铝基金属-有机框架材料的水吸附性能与大气集水应用[J]. 浙江大学学报(工学版), 2022, 56(1): 186-192.

En-yu WU,Guo-dong QIAN,Bin LI. Water adsorption in aluminum-based metal-organic framework for atmospheric water harvesting. Journal of ZheJiang University (Engineering Science), 2022, 56(1): 186-192.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2022.01.021        https://www.zjujournals.com/eng/CN/Y2022/V56/I1/186

图 1  水蒸气吸附动力学及吸附-脱附循环装置的示意图
图 2  ZJU-210的晶体结构示意图
图 3  ZJU-210活化前、后的粉末X射线衍射图谱
图 4  ZJU-210在77 K条件下的氮气吸附-脱附曲线及孔径分布
图 5  ZJU-210的稳定性测试
图 6  ZJU-210吸水性能的分析
图 7  ZJU-210吸水过程的模拟
图 8  ZJU-210的吸附-脱附动力学曲线
图 9  太阳光驱动的室外大气集水
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