Synthesis, characterization and gas transport properties of MOF-5 membranes
Synthesis, characterization and gas transport properties of MOF-5 membranes
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DOI：
10.1016/j.memsci.2011.07.048
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发表时间：
2011-10-15
影响因子：
9.5
通讯作者：
Lin, Y. S.
中科院分区：
文献类型：
--
作者：
Zhao, Zhenxia;Ma, Xiaoli;Lin, Y. S.
通过接种尺寸减小的MOF-5晶体，随后进行二次生长合成，制备厚度约14 μ m的连续且无裂纹的MOF-5膜。膜的质量进行了检查，通过分子探测方法，使用一系列的有机化合物的尺寸范围从0.56 nm至1.4 nm。2-二环己基膦基-2 '-（N，N-二甲基氨基）联苯通过M0 F-5膜的渗透蒸发通量（1.39 X 10（-6）mol/m（2）/s）可忽略不计，表明在M0 F-5膜中不存在大于M0 F-5结晶孔的缺陷。在T = 298-374 K，p（f）= 270 kPa和p（p）= 101 kPa条件下，随着分子量的增加，气体渗透率按H-2 > He > CO的顺序减小，类似于N-2 > CO2 > SF6，表明MOF-5膜的气体渗透机制为扩散主导。通过输入吸附等温线数据的渗透模型分析M0 F-5膜的C 02渗透数据，以获得M0 F-5中更可靠的C 02扩散率数据，其为1 X 10（-9）m（2）/s的量级，扩散活化能为约14.8kJ/mol。(C)2011 Elsevier B. V.保留所有权利。
Continuous and crake-free MOF-5 membranes of about 14 mu m in thickness were prepared by seeding size-reduced MOF-5 crystals followed by the secondary growth synthesis. The membrane quality was examined by a molecule probing method using a series of organic compounds with sizes ranging from 0.56 nm to 1.4 nm. Negligible pervaporation flux (1.39 x 10(-6) mol/m(2)/s) of 2-dicyclohexylphosphino-2'-(N, N-dimethylamino) biphenyl through the MOF-5 membrane shows absence of the defects larger than the MOF-5 crystalline pores in the MOF-5 membranes. The gas permeance for the MOF-5 membranes, under conditions of T = 298-374 K, p(f) = 270 kPa and p(p) = 101 kPa, decreases with increasing molecular weight of the molecules in the order of H-2 > He > CO similar to N-2 > CO2 > SF6, showing a diffusion-dominating permeation mechanism for the MOF-5 membranes. CO2 permeation data for the MOF-5 membranes were analyzed by a permeation model with the input of the adsorption isotherm data to obtain more reliable CO2 diffusivity data in MOF-5, which is in the order of 1 x 10(-9) m(2)/s with activation energy for diffusion of about 14.8 kJ/mol. (C) 2011 Elsevier B.V. All rights reserved.