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Cyclodextrin-dendrimer functionalized polysulfone membrane for the removal of humic acid in water

Authors

  • Soraya P. Malinga,

    1. Department of Applied Chemistry, University of Johannesburg, Doornfontein, South Africa
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  • Omotayo A. Arotiba,

    Corresponding author
    • Department of Applied Chemistry, University of Johannesburg, Doornfontein, South Africa
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  • Rui W. M. Krause,

    1. Department of Applied Chemistry, University of Johannesburg, Doornfontein, South Africa
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  • Selwyn F. Mapolie,

    1. Department of Chemistry and Polymer Science, University of Stellenbosch, Matieland, South Africa
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  • Mamadou S. Diallo,

    1. Department of Applied Chemistry, University of Johannesburg, Doornfontein, South Africa
    2. Graduate School of Energy, Environment, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
    3. Division of Engineering and Applied Science, Environmental Science and Engineering, California Institute of Technology, Pasadena, California
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  • Bhekie B. Mamba

    1. Department of Applied Chemistry, University of Johannesburg, Doornfontein, South Africa
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Correspondence to: O. A. Arotiba (E-mail: oarotiba@uj.ac.za)

ABSTRACT

Commercial polysulfone (PSf) membranes were crosslinked with a β-cyclodextrin-poly (propyleneimine) (β-CD-PPI) conjugate which had β-CD pendant arms using trimesoyl chloride (TMC) by interfacial polymerization. The morphology and physicochemical properties of the nanofiltration membranes were characterized using Fourier transform infrared/attenuated total reflectance (FT-IR/ATR) spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and cross-flow filtration system. Water-contact angle, water-intake capacity, and rejection capacities of the membranes were evaluated. The β-CD-G4 (generation 4)-PPI-PSf and β-CD-G3 (generation 3)-PPI-PSf membranes both exhibited high humic acid rejection of 72% as compared to the commercial PSf which exhibited 57%. The modified membranes were also more hydrophilic (36° to 41°) than PSf (76°). These results suggest that β-CD-PPI nanostructures are promising materials for the synthesis of membranes for the removal of humic acid from water. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4428–4439, 2013

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