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| 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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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.
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Received: 28 July 2021
Published: 05 January 2022
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| Fund: 国家自然科学基金资助项目（51803179） |
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Corresponding Authors:
Bin LI
E-mail: 2196090@zju.edu.cn;bin.li@zju.edu.cn
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铝基金属-有机框架材料的水吸附性能与大气集水应用
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
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