Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 37, Pages 19954-19962Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta03719h
Keywords
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Funding
- National Natural Science Foundation of China [21376225, 21476215]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [16HASTIT004]
- Excellent Youth Development Foundation of Zhengzhou University [1421324066]
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In this work, carbonic anhydrase (CA) molecules were embedded into metal-organic frameworks (MOFs) via physical absorption and chemical bonds, which could overcome the enzymatic inactivation and the poor separation property of pristine MOF materials. And then, these nanocomposites (enzyme-embedded MOFs) as the crystal seeds were in situ grown on oriented halloysite nanotube layers to develop novel biocatalytic composite membranes. These membranes exhibited optimal separation performance with a CO2/N-2 selectivity of 165.5, about 20.9 fold higher than that of the membrane without embedded CA molecules, surpassing the Robeson upper bound (2008). At the same time, the CO2 permeance increased about 3.2 fold (from 7.6 GPU to 24.16 GPU). Importantly, the biocatalytic composite membranes showed good stability and mechanical properties and were easily scalable, which could be extended to industrial applications.
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