微波合成MOF-808及其水蒸气捕集特性  

Microwave synthesis of MOF-808 and its water vapor uptake characteristics

作　　者：陈飞[1,2] 丁玉栋 马丽娇[2] 朱恂 程旻[1,2] 廖强[1,2] CHEN Fei;DING Yudong;MA Lijiao;ZHU Xun;CHENG Min;LIAO Qiang(Key Laboratory of Low-grade Energy Utilization Technologies and Systems(Chongqing University),Ministry of Education,Chongqing 400030,China;Institute of Engineering Thermophysics,Chongqing University,Chongqing 400030,China)

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400030 [2]重庆大学工程热物理研究所,重庆400030

出　　处：《化工进展》2023年第12期6461-6468,共8页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金面上项目(51876013);国家自然科学基金创新研究群体项目(52021004)。

摘　　要：金属有机骨架(MOFs)作为新型多孔材料,在干燥领域极具应用前景。本研究提供了一种MOF-808微波加热快速合成法,合成温度为140℃,甲酸浓度12.83mol/L。通过X射线衍射仪、场发射扫描电子显微镜、物理吸附仪等对MOF-808的样品组成、结构、比表面积以及形貌等进行表征分析。合成MOF-808材料的水蒸气吸附量随甲酸浓度增加而提高(由0.521g/g提高到0.810g/g),随吸附温度升高而降低,高湿度下MOF-808表现出较快的吸附速率,最佳的吸附工况为30℃、90%相对湿度。含湿混合气中CO_(2)浓度变化时,MOF-808平衡吸附量均值0.529g/g,标准差0.018,表明材料对水蒸气具有良好吸附选择性,CO_(2)不会对MOF-808捕集水蒸气能力产生影响。在较低再生温度(70℃)下MOF-808经过8次循环后再生效率仍高于90%,说明MOF-808材料用于干燥过程节能潜力较大,循环稳定性好。Metal organic frameworks(MOFs)as one of new porous materials,have promising application in drying field.In this study,a rapid microwave synthesis of MOF-808 at 140℃and 12.83mol/L formic acid concentration was reported.The obtained MOF-808 was thoroughly characterized by X-ray diffractometer,field emission scanning electron microscope and physical adsorption instrument.The water vapor adsorption capacity of MOF-808 increased with increasing formic acid concentration(0.521g/g to 0.810g/g),decreased with the increase of adsorption temperature,and the optimal adsorption working conditions were 30℃and 90%relative humidity.MOF-808 showed a higher rate of adsorption at high humidity.The average water vapor adsorption capacity of MOF-808 was 0.529g/g with standard deviation 0.018 under the conditions of various CO_(2) concentrations,which indicated that MOF-808 had a good adsorption selectivity for water vapor.The variation of CO_(2) concentration did not affect its water vapor uptake performance.The regeneration efficiency of MOF-808 was higher than 90%after eight cycles at lower temperature(70℃),which indicated that MOF-808 had a great energy conservation potential and much better cycle stability.

关 键 词：微波加热 金属有机骨架 水蒸气 吸附 干燥 二氧化碳 选择性 

分 类 号：TQ021.4[化学工程]