α-Fe2O3 fibers: An efficient photocatalyst for dye degradation under visible light

•Synthesis of a new photocatalyst material based on α-Fe2O3 fibers by Solution Blow Spinning (SBS) method.•α-Fe2O3 fibers showed high degradation efficiency of methylene blue and crystal violet dyes under visible light.•The photocatalytic mechanism of α-Fe2O3 fibers has been revealed and the samples...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-11, Vol.882, p.160683, Article 160683
Main Authors: Araujo, R.N., Nascimento, E.P., Firmino, H.C.T., Macedo, D.A., Neves, G.A., Morales, M.A., Menezes, R.R.
Format: Article
Language:English
Subjects:
Acetic acid
Dyes
Ferric oxide
Fibers
Hematite
Light irradiation
Magnetic measurement
Methylene blue
Mossbauer spectroscopy
Organic dye
Photocatalysis
Photocatalyst
Photodegradation
SBS
Spectrum analysis
Ultraviolet radiation
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Summary:•Synthesis of a new photocatalyst material based on α-Fe2O3 fibers by Solution Blow Spinning (SBS) method.•α-Fe2O3 fibers showed high degradation efficiency of methylene blue and crystal violet dyes under visible light.•The photocatalytic mechanism of α-Fe2O3 fibers has been revealed and the samples also show good recyclability results. [Display omitted] In this work, α-Fe2O3 fibers were successfully prepared via Solution Blow Spinning, followed by calcination at 800 °C for 2 h, and applied in the photodegradation of organic dyes. The precursor solution was prepared by dissolving 0.8 M iron nitrate and 12 w/v% PVP in an acetic acid/water (2:1) mixture. The as-synthesized nanostructures were characterized by scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) isothermal model, x-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), Mössbauer spectroscopy and magnetometry. The studies of photocatalytic degradation were performed using methylene blue (MB) and crystal violet (CV) dyes under visible and UV irradiation. The results indicated the formation of α-Fe2O3 fibers with a trigonal crystalline structure with an average diameter and BET surface area of 359 nm and 2.54 m2/g, respectively. The fibers showed a photodegradation efficiency of 66% and 48% for MB dye and 90% and 92% for the CV dye after 5 h of visible and ultraviolet light irradiation, respectively. The recycling studies indicated stability and efficiency after three cycles of degradation of the CV dye.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.160683