Polyphenol-mediated defect patching of graphene oxide membranes for sulfonamide contaminants removal and fouling control.
J Hazard Mater
; 469: 133890, 2024 May 05.
Article
en En
| MEDLINE
| ID: mdl-38422736
ABSTRACT
Graphene oxide (GO)-based laminar membranes are promising candidates for next-generation nanofiltration membranes because of their theoretically frictionless nanochannels. However, nonuniform stacking during the filtration process and the inherent swelling of GO nanosheets generate horizontal and vertical defects, leading to a low selectivity and susceptibility to pore blockage. Herein, both types of defects are simultaneously patching by utilizing tannic acid and Feâ
¢. Tannic acid first partially reduced the upper GO framework, and then coordinated with Feâ
¢ to form a metal-polyphenol network covering horizontal defects. Due to the enhanced steric hindrance, the resulting membrane exhibited a two-fold increase in sulfonamide contaminants exclusion compared to the pristine GO membrane. A non-significant reduction in permeance was observed. In terms of fouling control, shielding defects significantly alleviated the irreversible pore blockage of the membrane. Additionally, the hydrophilic metal-polyphenol network weakened the adhesion force between the membrane and foulants, thereby improving the reversibility of fouling in the cleaning stage. This work opens up a new way to develop GO-based membranes with enhanced separation performance and antifouling ability.
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MEDLINE
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En
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J Hazard Mater
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SAUDE AMBIENTAL
Año:
2024
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Article