4.8 Article

Photocatalytic Nanofiltration Membranes with Self-Cleaning Property for Wastewater Treatment

Journal

ADVANCED FUNCTIONAL MATERIALS
Volume 27, Issue 27, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201700251

Keywords

beta-FeOOH; nanofiltration membranes; photo-Fenton; polydopamine; self-cleaning

Funding

  1. Zhejiang Provincial Natural Science Foundation of China [LZ15E030001]
  2. National Natural Science Foundation of China [21534009]
  3. Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility [DE-AC02-06CH11357]

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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 beta-FeOOH nanorods. The PDA-PEI layer acts both as a nanofiltration selective layer and an intermediate layer for anchoring the beta-FeOOH nanorods via strong coordination complexes between Fe3+ and catechol groups. In visible light, the beta-(F)eOOH 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.

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