Boron removal from geothermal water by nanofiber-based membrane distillation membranes with significantly improved surface hydrophobicity

Bahar Ozbey-Unal, Elifnur Gezmis-Yavuz, Bahriye Eryildiz, Derya Y. Koseoglu-Imer, Bulent Keskinler, Ismail Koyuncu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

In this study, the hydrophobic nanofiber membranes were fabricated via electrospinning method for the removal of boron and salt from geothermal water by air gap membrane distillation (AGMD). Scanning electron microscopy (SEM), contact angle, liquid entry pressure (LEP) and membrane thickness were analyzed for the characterization of electrospun nanofiber membranes (ENMs). Firstly, ENMs were fabricated by using four different concentrations of polyvinylidene fluoride (PVDF) dope solution and PVDF concentration was optimized by considering both membrane characterization and filtration performance results. Then, the effect of heat treatment on membrane characterization and filtration performance was studied in which it was observed that the permeate flux was improved due to the decrease in membrane thickness while the mechanical strength of the ENMs was enhanced. Thereafter, different concentrations of polytetrafluoroethylene (PTFE) micro powder were added to the optimized PVDF membrane and the permeate flux was improved to 27.7 kg/m2 h. Finally, the real geothermal water experiments were examined using the optimized ENMs and it was concluded that the quality of permeate water was consistent with standard values for irrigation water which was less than 0.5 mg B/L and 250 μS/cm for both optimized membranes.

Original languageEnglish
Article number104113
JournalJournal of Environmental Chemical Engineering
Volume8
Issue number5
DOIs
Publication statusPublished - Oct 2020

Bibliographical note

Publisher Copyright:
© 2020 Elsevier Ltd.

Funding

This work was supported by the TUBITAK , the Scientific and Technological Research Council of Turkey (Project No: 115Y610).

FundersFunder number
TUBITAK
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu115Y610

    Keywords

    • Air gap membrane distillation
    • Boron removal
    • Electrospinning
    • Geothermal water
    • Nanofibrous membrane

    Fingerprint

    Dive into the research topics of 'Boron removal from geothermal water by nanofiber-based membrane distillation membranes with significantly improved surface hydrophobicity'. Together they form a unique fingerprint.

    Cite this