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Crown ether intercalated graphene oxide membranes for highly efficient sieving of cesium with a large water permeability.
- Source :
-
Separation & Purification Technology . Jul2024, Vol. 339, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
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Abstract
- • Proposed a simpler scheme for preparing membranes using non-covalent interactions. • A composite membrane provides excellent rejection and large water permeability. • CE@GO membrane for highly selective removal by crown ether pore size effect. The highly efficient sieving of Cs+ from natural brine resources has garnered considerable attention for the extraction of cesium raw materials. However, for the trade-off between ion rejection and water permeability, it remains challenging for graphene oxide (GO) membranes to improve efficient sieving of Cs+ with a large water permeance. Here, we have successfully addressed this challenge by fabricating a GO membrane that incorporates crown ether (CE) through π-π and CH-π interactions with GO sheets. This CE intercalation has resulted in a significantly enhanced Cs+ sieving capability from salt lake brines, concurrently improving water permeance. The unique Cs+ selective cavity structure of the CE has enabled the GO membrane to exhibit a Cs+ rejection rate of 94.4 % and a water permeance of 15.8 L m−2 h−1 bar−1 at a Cs+ concentration of 0.150 mmol/L (∼20 ppm). Compared to the pure GO membrane, these results represent an improvement of over 70 % in Cs+ rejection and more than 230 % in water permeance. Interestingly, we have also observed that this GO membrane exhibits a low Na+ system consisting of two components, the separation factor of Cs+/Na+ reaches up to 5.0, which is significant in monovalent ionic membrane separations. These significant discoveries provide a promising strategy for the highly efficient extraction and concentration detection of Cs+ from complex ion solutions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13835866
- Volume :
- 339
- Database :
- Academic Search Index
- Journal :
- Separation & Purification Technology
- Publication Type :
- Academic Journal
- Accession number :
- 176501868
- Full Text :
- https://doi.org/10.1016/j.seppur.2024.126702