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Superpermeable nanoporous carbon-based catalytic membranes for electro-Fenton driven high-efficiency water treatment

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Abstract

Based on the Hagen–Poiseuille equation, theoretical membrane permeability is inversely and directly proportional to its thickness and pore-radius, respectively, indicating that a thin membrane with an effective pore-radius is extremely permeable. However, the trade-off between selectivity and permeability restricts their applications for pressure-driven separation membranes. Hence, balancing the contradiction between the permeability and selectivity of a separation membrane is desired in future applications. Herein, we report a superpermeable nanoporous carbon (PC) membrane which offers a separation layer (∼80 nm) and effective pore radius (∼20 nm) by selectively removing parts of carbon atoms, thus greatly decreasing the transport resistance of water molecules through the membrane. The experimental results have shown a water flux of ∼8000 L m−2 h−1 bar−1 for the membrane. High selectivity is demonstrated via selective separation of nanoparticles with their narrowly distributed pores. Self-production of H2O2 and self-circulation of Fe2+/Fe3+ was achieved simultaneously on the PC membrane via coupling with electro-Fenton technology, which leads to the in situ production of hydroxyl radicals. The removal efficiencies of organic contaminants (SMX, BPA and phenol) by electro-Fenton driven PC membranes were ∼96.3%, ∼97.4% and 92.1%, respectively. Given their compatible high permeability and high selectivity, our porous PC membranes might provide an alternative as future membranes and motivate the design of innovative membranes.

Graphical abstract: Superpermeable nanoporous carbon-based catalytic membranes for electro-Fenton driven high-efficiency water treatment

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Publication details

The article was received on 31 Aug 2018, accepted on 30 Oct 2018 and first published on 31 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08479C
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Superpermeable nanoporous carbon-based catalytic membranes for electro-Fenton driven high-efficiency water treatment

    Q. Zhang, S. Chen, X. Quan, Y. Liu, H. Yu and H. Wang, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA08479C

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