Different metal-doped ZnS quantum dots photocatalysts for enhancing the permeability and antifouling performances of polysulfone membranes with and without UV irradiation

Vahid Vatanpour*, Okan Karatas, Saba Amiri, Hamid Reza Rajabi, Ismail Koyuncu, Alireza Khataee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

In this study, the effect of three different transition metal ion dopants (Mn2+, Fe2+, and Co2+) on the characteristics of zinc sulfide (ZnS) quantum dots (QDs) was investigated and the obtained QDs photocatalysts were applied for the modification of polysulfone (PSf) mixed matrix membranes to reduce membrane fouling. The synthesized QDs and fabricated membranes were fully identified with SEM, TEM, AFM, FTIR analyses, and also underwent porosity and contact angle tests. Flux recovery ratios (FRR) significantly increased from 69.8% (bare) to 85.0% (1% Fe-doped ZnS QDs) after modification of membranes with metal-doped QDs. The contact angles of the prepared membranes decreased with doping of dissimilar metals, therefore hydrophilicity increased, and reversible/non-reversible blockages were improved. Besides, the use of UV irradiation during the washing of the membranes increased the FRR of the photocatalytic activated membranes to 91.2%. Compared to the bare PSf membrane in dye solution filtration, 1% Fe-doped ZnS QDs membrane yielded twice as much flux and 15% higher FRR results. Therefore, the results proved that metal-doped QDs can be used in the modification of PSf membranes with high efficiency.

Original languageEnglish
Article number133705
JournalChemosphere
Volume294
DOIs
Publication statusPublished - May 2022

Bibliographical note

Publisher Copyright:
© 2022 Elsevier Ltd

Funding

The authors are thankful to the Kharazmi University for the support from the Kharazmi membrane research core (Grant number: H/4/360 ).

FundersFunder number
Kharazmi membrane research coreH/4/360
Kharazmi University

    Keywords

    • Anti-fouling
    • Dye rejection
    • Membrane modification
    • Metal-doped ZnS
    • Quantum dots
    • ZnS

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