Home >
News > Synthesis and post-synthetic modification of MIL-101(Cr)-NH₂ via a tandem diazotisation process
Synthesis and post-synthetic modification of MIL-101(Cr)-NH₂ via a tandem diazotisation process
Summary:
The authors from the University of Bath developed functionalized MIL-101(Cr) materials with high stability and tunable pores, achieving excellent CO₂/N₂ separation selectivity in gas adsorption applications.
Background:
1. MOFs are promising for gas storage/separation, but most amine-tagged MOFs tolerate not acidic diazotization conditions, and MIL-101(Cr)-NH₂ synthesis was rarely reported.
2. The authors proposed a tandem diazotization post-synthetic modification strategy, successfully preparing halo- and azo-functionalized MOFs.
Research Content:
1. Synthesis: Direct hydrothermal synthesis of MIL-101(Cr)-NH₂, followed by diazotization-substitution/coupling to obtain MIL-101(Cr)-I, -F, and -azo.
2. Characterizations:
1) BET: MIL-101(Cr)-NH₂ (2070 m²/g), -I (1431 m²/g), -F (1619 m²/g), -azo (722 m²/g); pore sizes 1.54/1.99 nm, 1.55/1.97 nm, 1.55/1.97 nm, 1.10/1.56 nm respectively.
2) SEM/TEM: MIL-101(Cr)-NH₂ has an average particle size of 164 nm.
3) NMR/UV-Vis: Confirmed functional group grafting; MIL-101(Cr)-azo shows a 400 nm absorption peak.
3. Application: CO₂ adsorption at 273 K: MIL-101(Cr)-NH₂ (3.02 mmol/g), -azo has 73 selectivity at 0.1 atm.
4. Mechanism: Amino/phenol groups enhance CO₂ interaction; functional group size affects pore structure and adsorption performance.
Outlook:
This research provides a flexible MOF functionalization method, enriches gas separation materials, and lays a foundation for high-selectivity adsorption applications.
Synthesis and post-synthetic modification of MIL-101(Cr)-NH₂ via a tandem diazotisation process
Authors: Dongmei Jiang, Luke L. Keenan, Andrew D. Burrows, Karen J. Edler
DOI: 10.1039/c2cc36344e
Link: http://pubs.rsc.org/en/content/articlelanding/2012/cc/c2cc36344e
The above review is for academic progress sharing. For any errors or copyright issues, please contact us for correction or removal.
