Dual Regulation of Graphene Oxide Membrane by Crosslinker and Hydrophilic Promoter for Dye Separation
Résumé
Graphene oxide (GO)-based membranes have shown considerable promise in the field of water treatment. However, the structural swelling of GO membranes in water has hindered their further development. A single regulatory approach seems difficult to simultaneously improve permeability, selectivity, and stability. In this study, we present a dual regulation strategy for GO membranes employing the 1,4-Diaminobutane crosslinker to prevent swelling and maintain an interlayer spacing of 1.34 nm, resulting in effective dye rejection, and employing the hydrophilic EMT-type zeolite promoter to improve the membrane's water permeability. The obtained NH 2-GO/10EMT composite membrane exhibited enhanced pure water flux (from 9.0 to 20.8 L/m 2 •h•bar) and anionic dye rejection (from 87.2% to 97.6%) with promising structure stability (at least 20 h), while greatly improving the membrane's fouling resistance (the water recovery ratio increased from 46.5% to 86.2%). Our findings provide a straightforward and efficient approach to the development of high-performance GO membranes for selective water separation.
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