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A comparative study of perfluorinated and non-fluorinated UiO-67 in gas adsorption
Journal of Porous Materials ( IF 2.5 ) Pub Date : 2020-08-07 , DOI: 10.1007/s10934-020-00941-w
Anastasia M. Cheplakova , Konstantin A. Kovalenko , Andrey S. Vinogradov , Victor M. Karpov , Vyacheslav E. Platonov , Vladimir P. Fedin

Metal–organic frameworks (MOFs) are perspective materials for application in gas storage, separation and purification. The perfluorination of organic linker is expected to change significantly the surface properties of a MOF and therefore, the adsorption behaviour due to small size, high electronegativity and polarizing ability of fluorine atoms. To reveal the effect of extensive linker fluorination on the properties of MOF, we have developed new method of synthesis of \({\hbox {Zr}}_{6}\) MOF based on perfluorinated biphenyl-4,4\('\)-dicarboxylate of UiO-67 structure denoted as UiO-67-F8. \({\hbox {N}}_{2}\) adsorption at 77 K confirms that UiO-67-F8 is a microporous solid with the BET surface area of \(1629\,{\hbox {m}}^{2}\,{\hbox {g}}^{-1}\) which is the best value for perfluorinated MOFs. Extensive investigations of properties of UiO-67-F8 reveal that hydrophobicity and hydrolytic stability are similar to the parent UiO-67. The low-pressure gas adsorption gravimetric uptakes (\({\hbox {N}}_{2},\)\({\hbox {CO}}_{2},\)\({\hbox {CH}}_{4},\)\({\hbox {C}}_{2}\)-hydrocarbons) at 273 and 298 K are slightly lower for UiO-67-F8 due to larger density and lower pore volume. The results obtained show that the difference in IAST selectivity factors for UiO-67-F8 and UiO-67 are negligible and both non-fluorinated and perfluorinated surfaces are almost identical for adsorption of the most frequently studied gases.



中文翻译:

全氟化和非氟化UiO-67在气体吸附中的比较研究

金属有机框架(MOF)是用于气体存储,分离和纯化的透视材料。期望有机连接基的全氟化会显着改变MOF的表面性质,因此会由于氟原子的小尺寸,高电负性和极化能力而导致其吸附行为。为了揭示对MOF的性质广泛接头氟化的效果,我们已经开发的合成的新方法\({\ hbox中的Zr {}} _ {6} \) MOF基于全氟化的联苯4,4 \('\ )表示为UiO-67-F8的UiO-67结构的二羧酸盐。\({\ hbox {N}} _ {2} \)在77 K的吸附证实UiO-67-F8是微孔固体,BET表面积为\(1629 \,{\ hbox {m}} ^ { 2} \,{\ hbox {g}} ^ {-1} \)这是全氟化MOF的最佳价值。对UiO-67-F8的性质进行的广泛研究表明,疏水性和水解稳定性与母体UiO-67相似。低压气体吸附重量吸收(\({\ hbox {N}} _ {2},\)\({\ hbox {CO}} _ {2},\)\({\ hbox {CH}} _ {4},\)\({\ hbox {C}} _​​ {2} \) -烃)在UiO-67-F8的273和298 K处由于较低的密度和较小的孔体积而略低。获得的结果表明,对于UiO-67-F8和UiO-67的IAST选择性因子的差异可以忽略不计,对于最常研究的气体,非氟化表面和全氟化表面几乎相同。

更新日期:2020-08-08
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