Journal
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
Volume 106, Issue -, Pages 34-50Publisher
ELSEVIER
DOI: 10.1016/j.jtice.2019.10.020
Keywords
Composite NF membrane; Chelate reaction; Electrostatic self-assembly; Anti-bacterial; Dye recycle
Categories
Funding
- National Natural Science Foundation of China [21476006]
- State Key Laboratory of Separation Membranes and Membrane Processes of Tianjin Polytechnic University [M2-201608]
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Composite nanofiltration (NF) membranes with anti-bacterial activity were prepared by electrostatic self-assembly. A novel composite (Ag+-PEI/ Cu2+-PEI/ Fe3+-PEI) was obtained by the chelate reaction of polyethylenimine (PEI) with metal ion, which constituted the main component of the separation layer of the prepared membrane. Three composite (Ag+-PEI/ Cu2+-PEI/ Fe3+-PEI) NF membranes prepared at optimized condition exhibited excellent permeability (121 L.m(-2).h(-1).MPa-1/71 L.m(-2).h(-1).MPa-1/ 73 L.m(-2).h(-1).MPa-1) and high rejection (96.5%/ 94.5%/ 91.6%) for acid fuchsin as well as low rejection (31.5%/ 27.5%/ 23.7%) for MgSO4. Meanwhile, the higher flux recovery ratio (FRR) of dye was observed for the Fe3+-PEI membrane (FRRFe=91.5%) than that for others ((FRRCu=83.2%) and (FRRAg=76.4%)). Furthermore, these three NF membranes also presented good hydrophilicity (59 degrees/39 degrees/35 degrees), excellent anti-bacterial activity (up to 95% against E. coil and over 90% against S. aureus) and good long-term stability in our trails. These results were of great significance for dye recycle in industrial field. (C) 2019 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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