General synthesis of ultrafine metal oxide/reduced graphene oxide nanocomposites for ultrahigh-flux nanofiltration membrane

Wanyu Zhang, Hai Xu, Fei Xie, Xiaohua Ma, Bo Niu (), Mingqi Chen, Hongyu Zhang, Yayun Zhang and Donghui Long ()
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Wanyu Zhang: East China University of Science and Technology
Hai Xu: East China University of Science and Technology
Fei Xie: East China University of Science and Technology
Xiaohua Ma: East China University of Science and Technology
Bo Niu: East China University of Science and Technology
Mingqi Chen: East China University of Science and Technology
Hongyu Zhang: East China University of Science and Technology
Yayun Zhang: East China University of Science and Technology
Donghui Long: East China University of Science and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Graphene-based membranes have great potential to revolutionize nanofiltration technology, but achieving high solute rejections at high water flux remains extremely challenging. Herein, a family of ultrafine metal oxide/reduced graphene oxide (rGO) nanocomposites are synthesized through a heterogenous nucleation and diffusion-controlled growth process for dye nanofiltration. The synthesis is based on the utilization of oxygen functional groups on GO surface as preferential active sites for heterogeneous nucleation, leading to the formation of sub-3 nm size, monodispersing as well as high-density loading of metal oxide nanoparticles. The anchored ultrafine nanoparticles could inhibit the wrinkling of the rGO nanosheet, forming highly stable colloidal solutions for the solution processing fabrication of nanofiltration membranes. By functioning as pillars, the nanoparticles remarkably increase both vertical interlayer spacing and lateral tortuous paths of the rGO membranes, offering a water permeability of 225 L m−2 h−1 bar−1 and selectivity up to 98% in the size-exclusion separation of methyl blue.

Date: 2022
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DOI: 10.1038/s41467-022-28180-4

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