Chitosan-functionalized sodium alginate-based electrospun nanofiber membrane for As (III) removal from aqueous solution

Md. Eman Talukder, Md. Nahid Pervez, Wang Jianming, Ziwei Gao, George K. Stylios, Mohammad Mahbubul Hassan, Hongchen Song, Vincenzo Naddeod

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Environment-friendly chitosan-modified-poly(vinyl alcohol) or (PVA)/sodium alginate (SA) electrospun nanofiber membrane (ENM) adsorbent was prepared for the removal of As(III) from an aqueous solution. The chitosan(CS)-functionalized-PVA/SA ENM (CS-f-PVA/SA) was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and X-Ray diffraction (XRD). The CS-f-PVA/SA ENM showed the maximum As (III) adsorption capacity at neutral pH (540.40 mg g-1). The adsorption experiments were conducted by varying the initial pH of the arsenic solutions and also in the presence of different coexisting anions, such Cl- and F-, SO42−, and PO43−. Moreover, the kinetic studies were performed to depict the rate of As(III) sorption onto CS-f-PVA/SA ENM. The As(III) adsorption reached equilibrium within 90 min, which well fitted to the pseudo-second-order kinetic model. The initial pH of arsenic solutions greatly affected the adsorption efficiency but the presence of competing anions in arsenic solutions showed a moderate effect on the arsenic adsorption. The FTIR and XRD analyses suggest that–NH2, –OH, and C–O functional groups of CS-f-PVA/SA ENM are responsible for As(III) uptake. The prepared CS-f-PVA/SA ENM can be easily regenerated using 0.003 M NaOH, and the As(III) removal rate was still above 90% to 50% after ten successive adsorption-desorption cycles. Thus, such a nanofiber-based adsorbent is quite promising for the removal of As(III) from potable water and can be beneficial in combating the current challenges of arsenic pollution.
Original languageEnglish
Article number106693
JournalJournal of Environmental Chemical Engineering
Volume9
Issue number6
Early online date29 Oct 2021
DOIs
Publication statusPublished - Dec 2021

Keywords

  • Arsenic
  • Electrospinning
  • Nanoadsorbents
  • Nanofiber membranes
  • Surfaced modification

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology

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