Contact
    Start Publications Nanofiltration membrane embedded with hydroxyapatite nanowires ...
    ←  Publication Finder
    Attension

    Nanofiltration membrane embedded with hydroxyapatite nanowires as interlayer towards enhanced separation performance

    Year: 2021

    Journal: Colloid Surf. A-Physicochem. Eng. Asp., Volume 626, OCT 5

    Authors: Chen, Leilei; Zhang, Chunxiao; Gao, Ailin; Cui, Jian; Yan, Yehai

    Organizations: National Natural Science Foundation of China [51803105]; Shandong Provincial Natural Science Foundation [ZR2019QEM002]; Introduction and Cultivation Plan of Young Innovative Talents in Colleges and Universities of Shandong Province

    Keywords: Nanofiltration membrane; Permeation; Hydroxyapatite nanowire; Mono/bivalent salt selectivity

    The triple-layered composite nanofiltration (NF) membrane consisting of thin polyamide (PA) top layer covered on polymeric porous membrane with interlayer has been popularly accepted, even commercially applied, to solve the trade-off issue. The nanofiltration performance was determined by the physicochemical properties of all layers. In the current work, hydroxyapatite (HAP) nanowires were adopted as a new type of interlayer material. Its superiority of ultra-hydrophilicity and electronegativity made it a container of aqueous monomers. As a result, ultra-thin and defect-free PA layer with a thickness of similar to 28 nm was generated owing to the low piperazine (PIP) concentration and restricted diffusion. In addition, the ultra-hydrophilic polysulfone (PSf) support layer was also helpful to reduce mass transfer resistance. The prepared PA/HAP/PSf composite membrane presented high salt aqueous solution permeation (177 L m(-2) h(-1) under 6 bar), excellent divalent salt rejection (98.2% for Na2SO4) and high mono/bivalent salt selectivity (19 for NaCl/Na2SO4 mixed solutions). This work proposed a useful strategy to construct highly permeable and selective NF membrane.
    View publication