Optimization and performance studies of NFDK membrane for ionic separation from aqueous solutions

Danial Qadir, Rizwan Nasir, Hafiz Abdul Mannan, Hilmi Mukhtar

    Research output: Contribution to journalArticlepeer-review


    The modern world is facing one of the serious threats (i.e., freshwater) to the life on the planet and efforts are being made to provide freshwater for the current population. The novelty of this work lies in a comprehensive evaluation of properties and performance of commercially available NFDK membrane for various monovalent (NaCl) and divalent (CaCl 2, MgCl 2) salts, particularly tin salt (SnCl 2). The central composite design (CCD) and response surface methodology were applied in designing the experiments to assess the effects of the numerical factors, i.e., pressure, concentration, and categorical factors like salt type, on the flux and rejection. The characterization results showed the asymmetric structure with three distinct layers, and hydrophilic surfaces with negative surface charges and thus was expected to perform well depending upon other operational parameters. It was deduced that the Donnan exclusion mechanism dominantly regulated the tin ion rejection 95.14% and permeate flux 71.18 L/m 2.h at 10 bar pressure. The optimization results showed that predicted results were in good agreement with experimental results. The R  2= 0.99 showed the effectiveness of CCD in the optimization of NFDK performance.

    Original languageEnglish
    Pages (from-to)1815-1831
    Number of pages17
    JournalChemical Papers
    Issue number3
    Early online date28 Jan 2022
    Publication statusPublished - 1 Mar 2022

    Bibliographical note

    Funding Information:
    The authors are cordially grateful to the Universiti Teknologi PETRONAS for their laboratory facilities and the Ministry of Higher Education Malaysia's financial support (MyRA-0153AB J16).

    Publisher Copyright:
    © 2021, Institute of Chemistry, Slovak Academy of Sciences.


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