Blend-electrospun graphene oxide/Poly(vinylidene fluoride) nanofibrous membranes with high flux, tetracycline removal and anti-fouling properties

Jeong Ann Park, Aram Nam, Jae Hyun Kim, Seong Taek Yun, Jae Woo Choi, Sang-Hyup Lee

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Graphene oxide (GO)/poly(vinylidene fluoride) (PVDF) electrospun nanofibrous membranes (ENMs) have been fabricated to remove tetracycline (TC) from water via adsorptive-filtration. The pure water permeation flux of GO/PVDF ENMs (27,407–29,337 LMH/bar) was increased compared with that of PVDF ENMs. The flow pore diameter was steadily reduced by increasing the GO content from 0 to 1.5 wt% in the GO/PVDF ENMs. The maximum TC adsorption capacity of GO is 720.26 mg/g (Langmuir model) and GO retained its TC adsorption property after incorporation into GO/PVDF ENMs during water filtration (transmembrane pressure = 0.91 bar). The maximum experimental TC removal capacity (qa,exp) was 17.92 mg/g with 1.5 wt% of GO (GO1.5/PVDF) ENMs, which was similar to the modified dose-response model value of 18.03 mg/g. In the presence of natural organic matter, TC adsorption was enhanced, because hydrophobic organic carbon improved hydrophobic and π-π interactions. The presence of Cu(II) further improved the TC adsorption capacity of GO1.5/PVDF ENMs through cation bridging. However, the presence of Ca(II) hindered TC adsorption by an electron shielding effect. For examining anti-fouling activity of GO1.5/PVDF ENMs, the log removal values of both bacteria, Escherichia coli and Staphylococcus aureus, were maintained at over 5 during water filtration. In addition, incorporation of GO in PVDF ENMs prevents bovine serum albumin (BSA) adsorption by both increasing the hydrophilicity of the ENMs forming hydration layer on the surface and electrostatic repulsion between both negatively charged BSA and GO in GO1.5/PVDF ENMs (zeta potential = - 14.14 mV, deionized water at pH 6).

Original languageEnglish
Pages (from-to)347-356
Number of pages10
JournalChemosphere
Volume207
DOIs
Publication statusPublished - 2018 Sep 1

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Keywords

  • Anti-fouling
  • Electrospun nanofibrous membranes
  • Graphene oxide
  • poly(vinylidene fluoride)
  • Tetracycline

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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