3 years ago

Photocatalytic Nanofiltration Membranes with Self-Cleaning Property for Wastewater Treatment

Photocatalytic Nanofiltration Membranes with Self-Cleaning Property for Wastewater Treatment
Yan Lv, Ai He, Seth B. Darling, Zhi-Kang Xu, Guang-Peng Wu, Shang-Jin Yang, Chao Zhang
Membrane fouling is one of the most severe problems restricting membrane separation technology for wastewater treatment. This work reports a photocatalytic nanofiltration membrane (NFM) with self-cleaning property fabricated using a facile biomimetic mineralization process. In this strategy, a polydopamine (PDA)/polyethyleneimine (PEI) intermediate layer is fabricated on an ultrafiltration membrane via a co-deposition method followed by mineralization of a photocatalytic layer consisting of β-FeOOH nanorods. The PDA–PEI layer acts both as a nanofiltration selective layer and an intermediate layer for anchoring the β-FeOOH nanorods via strong coordination complexes between Fe3+ and catechol groups. In visible light, the β-FeOOH layer exhibits efficient photocatalytic activity for degrading dyes through the photo-Fenton reaction in the presence of hydrogen peroxide, endowing the NFM concurrently with effective nanofiltration performance and self-cleaning capability. Moreover, the mineralized NFMs exhibit satisfactory stability under simultaneous filtration and photocatalysis processing, showing great potential in advanced wastewater treatment. A photocatalytic nanofiltration membrane (NFM) with self-cleaning capability is fabricated via a facile biomimetic mineralization process. In visible light, this membrane exhibits efficient photocatalytic activity for degrading dyes through the photo-Fenton reaction concurrently with effective nanofiltration performance. The as-prepared NFM shows great potential in advanced textile wastewater treatment with satisfactory stability.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201700251

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