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Transforming Ti3C2Tx MXene's intrinsic hydrophilicity into superhydrophobicity for efficient photothermal membrane desalination.


ABSTRACT: Owing to its 100% theoretical salt rejection capability, membrane distillation (MD) has emerged as a promising seawater desalination approach to address freshwater scarcity. Ideal MD requires high vapor permeate flux established by cross-membrane temperature gradient (∆T) and excellent membrane durability. However, it's difficult to maintain constant ∆T owing to inherent heat loss at feedwater side resulting from continuous water-to-vapor transition and prevent wetting transition-induced membrane fouling and scaling. Here, we develop a Ti3C2Tx MXene-engineered membrane that imparts efficient localized photothermal effect and strong water-repellency, achieving significant boost in freshwater production rate and stability. In addition to photothermal effect that circumvents heat loss, high electrically conductive Ti3C2Tx MXene also allows for self-assembly of uniform hierarchical polymeric nanospheres on its surface via electrostatic spraying, transforming intrinsic hydrophilicity into superhydrophobicity. This interfacial engineering renders energy-efficient and hypersaline-stable photothermal membrane distillation with a high water production rate under one sun irradiation.

SUBMITTER: Zhang B 

PROVIDER: S-EPMC9177613 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature

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Transforming Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene's intrinsic hydrophilicity into superhydrophobicity for efficient photothermal membrane desalination.

Zhang Baoping B   Wong Pak Wai PW   Guo Jiaxin J   Zhou Yongsen Y   Wang Yang Y   Sun Jiawei J   Jiang Mengnan M   Wang Zuankai Z   An Alicia Kyoungjin AK  

Nature communications 20220608 1


Owing to its 100% theoretical salt rejection capability, membrane distillation (MD) has emerged as a promising seawater desalination approach to address freshwater scarcity. Ideal MD requires high vapor permeate flux established by cross-membrane temperature gradient (∆T) and excellent membrane durability. However, it's difficult to maintain constant ∆T owing to inherent heat loss at feedwater side resulting from continuous water-to-vapor transition and prevent wetting transition-induced membran  ...[more]

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