Tuning transport in graphene oxide membrane with single-site copper (II) cations.
iScience
; 25(4): 104044, 2022 Apr 15.
Article
en En
| MEDLINE
| ID: mdl-35359810
ABSTRACT
Controlling the ion transport through graphene oxide (GO) membrane is challenging, particularly in the aqueous environment due to its strong swelling tendency. Fine-tuning the interlayer spacing and chemistry is critical to create highly selective membranes. We investigate the effect of single-site divalent cations in tuning GO membrane properties. Competitive ionic permeation test indicates that Cu2+ cations dominate the transport through the 2D channels of GO membrane over other cations (Mg2+/Ca2+/Co2+). Without/With the single-site M2+ modifications, pristine GO, Mg-GO, Ca-GO, and Cu-GO membranes show interlayer spacings of â¼13.6, 15.6, 14.5, and 12.3 Å in wet state, respectively. The Cu-GO membrane shows a two-fold decrease of NaCl (1 M) permeation rate comparing to pristine GO, Mg-GO, and Ca-GO membranes. In reverse osmosis tests using 1000 ppm NaCl and Na2SO4 as feeds, Cu-GO membrane shows rejection of â¼78% and â¼94%, respectively, which are 5%-10% higher than its counterpart membranes.
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MEDLINE
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IScience
Año:
2022
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Article
País de afiliación:
Estados Unidos