Diamine Functionalization of a Metal-Organic Framework by Exploiting Solvent Polarity for Enhanced CO2 Adsorption
- Authors
- Choi, Doo San; Kim, Dae Won; Lee, Jung-Hoon; Chae, Yun Seok; Kang, Dong Won; Hong, Chang Seop
- Issue Date
- 18-8월-2021
- Publisher
- AMER CHEMICAL SOC
- Keywords
- carbon dioxide capture; diamine functionalization; metal-organic frameworks; solvent exchange; solvent polarity
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.13, no.32, pp.38358 - 38364
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 13
- Number
- 32
- Start Page
- 38358
- End Page
- 38364
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/136838
- DOI
- 10.1021/acsami.1c10659
- ISSN
- 1944-8244
- Abstract
- Diamine-appended metal-organic frameworks (MOFs) exhibit exceptional CO2 adsorption capacities over a wide pressure range because of the strong interaction between basic amine groups and acidic CO2. Given that their high CO2 working capacity is governed by solvent used during amine functionalization, a systematic investigation on solvent effect is essential but not yet demonstrated. Herein, we report a facile one-step solvent exchange route for the diamine functionalization of MOFs with open metal sites, using an efficient method to maximize diamine loading. We employed an MOF, Mg-2(dobpdc) (dobpdc(4-) = 4,4'-dioxido-3,3'-biphenyldicarboxylate), which contains high-density open metal sites. Indirect grafting with N-ethylethylenediamine (een) was performed with a minimal amount of methanol (MeOH) via multiple MeOH exchanges and diamine functionalization, resulting in a top-tier CO2 adsorption capacity of 16.5 wt %. We established the correlation between N,N- dimethylformamide (DMF) loading and infrared peaks, which provides a simple method for determining the amount of the remaining DMF in Mg-2 (dobpdc). All interactions among Mg, DMF, diamine, and solvent were analyzed by van der Waals (vdw)- corrected density functional theory (DFT) calculations to elucidate the effect of chemical potential on diamine grafting.
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