Study on competitive adsorption properties of benzene/water on different MOFs
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摘要：
通过溶剂热法合成了4种不同骨架性质的金属-有机框架(Metal-Organic Frameworks,MOFs)MIL-101,MIL-Z1,A520和Zr-Fuma,表征了其物化性质和结构,结合静态吸附、动态吸附测试研究了苯、水在MOFs上的吸附行为.结果表明,MIL-101的高比表面积是其具有最高苯饱和吸附量的关键因素;根据理想吸附溶液理论(Ideal Adsorbed Solution Theory,IAST),具有配位饱和结构、弱极性的MIL-101,MIL-Z1,A520对苯/水表现出良好的竞争吸附选择性,其中超微孔A520的选择性高达12.7,具有最佳低浓度苯的捕获能力;动力学拟合显示苯吸附主要符合准一级动力学,为物理吸附,水的吸附符合准二级动力学,以化学吸附为主,但缺陷位的存在使得Zr-Fuma对苯吸附以化学吸附为主;苯和水对MOFs再生能力的影响不同,水对再生性的影响更大.
Four Metal-Organic Frameworks(MOFs),including MIL-101,MIL-Z1,A520 and Zr-Fuma,with different structure features were prepared by solvothermal method.The physicochemical properties were analyzed and the adsorption behaviors of benzene and water on MOFs were studied using static and dynamic adsorption tests.The high specific surface area of MIL-101 was the key factor for its highest benzene adsorption capacity;according to Ideal Adsorbed Solution Theory(IAST),MIL-101,MIL-Z1 and A520 with ligand-saturated structure and weak polarity showed good benzene/water adsorption selectivity,among which the ultra-microporous A520 was up to 12.7,exhibited the best ability to capture benzene at low concentration.The adsorption process of benzene was mainly consistent with pseudo-first-order kinetic,which represented physical adsorption,while water adsorption was chemisorption,following pseudo-second-order kinetic.Especially,the benzene adsorption overall was chemical process due to defects in Zr-Fuma.The impact of benzene and water on regeneration of MOFs was different,and water affected more.
作者：
潘婷婷 刘芳 王建成 鲍卫仁 胡江亮 王兵
Pan Tingting;Liu Fang;Wang Jiancheng;Bao Weiren;Hu Jiangliang;Wang Bing(State Key Laboratory of Clean and Efficient Coal Utilization,Key Laboratory of Coal Science and Technology,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)
机构地区：
太原理工大学、省部共建煤基能源清洁高效利用国家重点实验室
出处：
《betway官方app 学报：自然科学版》 CAS 北大核心 2023年第2期91-101,共11页
Journal of Henan Normal University(Natural Science Edition)
基金：
国家自然科学基金(22206148) 山西省应用基础研究计划重点自然基金项目(201901D111003(ZD)) 山西省重点研发计划社会发展项目(201903D311005).
关键词：
MOFS 苯吸附 水吸附 吸附机制
MOFs benzene adsorption water adsorption adsorption mechanisms
分类号：
X511 [环境科学与工程—环境工程] TQ424 [化学工程]
