Multivariate metal–organic framework MTV-MIL-101 via post-synthetic cation exchange: is it truly achievable?

Abstract

Applying Szilágyi's procedure for the SACS process using aqueous solutions resulted in the formation of the metal oxide particles. However, by using DMF, mixed-metal MIL-101 was successfully obtained.

Pebax® 2533/PVDF thin film mixed matrix membranes containing MIL-101 (Fe)/GO composite for CO2 capture

“…22,25 Liu et al 22 and Zhao et al 25 found that the BET surface area of MIL-101 (Fe) is 608 m 2 g −1 and 199 m 2 g −1 , respectively. Zorainy et al 32 The texture properties and the crystal size of MIL-101 (Fe) are signicantly inuenced by the synthesis conditions. 21 In comparison to MIL-101 (Fe), the BET surface area, the total pore volume and the micropore volume decreased dramatically (Table 2), which can be ascribed to the coverage of MIL-101 (Fe) by nonporous GO sheets with low surface area.…”

“…Liu et al22 and Zhao et al25 found that the BET surface area of MIL-101 (Fe) is 608 m 2 g −1 and 199 m 2 g −1 , respectively. Zorainy et al32 found the BET surface area of MIL-101 (Cr) and mixed-metal MIL-101(Cr/Fe) is over 2000 m 2 g −1 . Comparing with MIL-101 (Cr), the low BET surface area of the synthesized MIL-101 (Fe) could be attributed to the smaller crystal size of MIL-101 (Cr) than the synthesized MIL-101 (Fe).The texture properties and the crystal size of MIL-101 (Fe) are signicantly inuenced by the synthesis conditions 21.…”

Multivariate Metal–Organic Frameworks Ranging from a Homogeneous Uniform Distribution to Heterogeneous 1D, 2D, and 3D Distributions of Mixed Building Blocks

“…Post-synthetic exchange (PSE) of building blocks in metal–organic frameworks (MOFs) is a well-established and effective method for creating multivariate MOFs (MTV-MOFs). − These MTV-MOFs display improved properties that go beyond the mere sum of their individual components. − Despite the common occurrence of PSE, the details of the exchange process remain not fully understood. − When the diffusion rate of the incoming building blocks is slower than their exchange rate, a surface-to-core directional exchange takes place. This results in a heterogeneous microstructural MTV-MOF, which, during the PSE process, displays a three-dimensional (3D) core–shell distribution of original and incoming building blocks.…”