Abstract
Layer-by-layer (LbL) assembly technology is a facile method for constructing thin film composite membrane. Herein, a novel nanofiltration (NF) membrane was prepared by LbL assembly of polyethyleneimine (PEI) and sodium lignosulfonate (LS) followed by cross-linking. The surface composition, morphology, and property of PEI/LS bilayer were detailedly investigated by FTIR/ATR, XPS, SEM, AFM, and water contact angle test. The PEI/LS bilayer full of amino and hydroxyl groups presents increased roughness and improved hydrophilicity. Moreover, the NF performance of PEI/LS LbL assembly membranes can be modulated by bilayer number, polyelectrolyte concentration, and salt content. The water flux reduced while the salt rejection greatly improved as increasing the bilayer numbers, PEI concentration, or NaCI content. More than 95% MgSO4 and MgCI2, as well as 80% NaCI can be rejected by a NF membrane prepared by 6 PEI/LS bilayers, 1 wt% PEI, 0.5 wt% LS, and 1 mol/L NaCI. Furthermore, this NF membrane can be used to remove more than 95% heavy metal ions (Cd2+, Zn2+, Mn2+, Cr2+, Cu2+, and Ni2+). This work proposed a promising NF membrane by using PEI/LS as low cost polyelectrolytes and facile LbL assembly method, which should receive much attention in water purification.
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Acknowledgments
This work was financially supported by Zhejiang Provincial Natural Science Foundation of China (No. LY18E030002), Natural Science Foundation of Ningbo (No. 2018A610111), and K.C. Wong Magna Fund in Ningbo University. We acknowledge Dr. Lijing Zhu, Dr. Linghui Wang, and Dr. Lin Gu for their experimental support and advice.
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Xie, MY., Wang, J. & Wu, QY. Nanofiltration Membranes via Layer-by-layer Assembly and Cross-linking of Polyethyleneimine/Sodium Lignosulfonate for Heavy Metal Removal. Chin J Polym Sci 38, 965–972 (2020). https://doi.org/10.1007/s10118-020-2422-x
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DOI: https://doi.org/10.1007/s10118-020-2422-x