Surface Modification and Applications of Metal-Organic Frameworks
Date Issued
2016
Date
2016
Author(s)
Chiu, Hao-Che
Abstract
This work is aimed at enhancing the sorption performance of metal-organic frameworks (MOFs) by coating another porous material (a different MOF, zeolite, or amorphous silicon oxide) to create novel core-shell materials. A number of properties, including the acidic resistance, hydrothermal stability, water sorption capacity, and ion sorption capacity, were investigated to determine the appropriate “core” material and “shell” materials. To design high-performance sorbents, materials with high sorption capacity would serve as “core”, and those with high stability would serve as “shell”. For water vapor adsorption, FeBTC with high sorption capacity but poor cyclic stability was chosen as the “core” material. ZIF-7, ZIF-8, and amorphous SiO2 were deposited on FeBTC respectively as the “shell” material. 6 core-shell materials were synthesized under various conditions. In general the core-shell materials have lower water vapor sorption capacity at the first adsorption cycle in comparison to pristine FeBTC. However, the cyclic adsorption stability has been improved through the creation of core-shell materails. For ionic sorption application, we discussed the sorption of indium ion because it is a common waste of electronic panel factory. ZIF-8 was chosen as the core material due to its high indium sorption capacity. ZIF-8 has low acid resistance, but the indium solution is usually acidic. We attempt to deposit materials with high acid resistance on ZIF-8, such as amorphous silica. Although the ZIF-8@silica did not show an improvement of acidic stability, we believed that it was due to the low coverage of the silica on ZIF-8.
Subjects
Metal-organic frameworks
zeolite
core-shell
water vapor adsorption
ionic adsorption
SDGs
Type
thesis
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