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  1. Home
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  5. Formation of Fe-doped ZrO₂ nanotube arrays in glycerol/formamide at varying fluoride content for Cr(VI) photoreduction
 
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Formation of Fe-doped ZrO₂ nanotube arrays in glycerol/formamide at varying fluoride content for Cr(VI) photoreduction

Journal
Materials Today: Proceedings
Date Issued
2024-01-01
Author(s)
Hanis Nadirah Che Fauzi N.
Nurulhuda Bashirom
Universiti Malaysia Perlis
Juliana Jelaini F.
Lockman Z.
DOI
10.1016/j.matpr.2023.10.151
Abstract
Fe-doped ZrO2nanotubes (Fe-ZNTs) were produced by anodizing a Zr-5 wt% Fe (Zr-5Fe) alloy in a mixture of fluoride-containing glycerol/formamide (FA) (1:1 ratio)/1 vol% H2O at 50 V for 3 h in different concentrations of ammonium fluoride (NH4F) (0.3, 0.5, and 1.0 wt%). These materials were synthesized to serve as photocatalysts for the removal of hexavalent chromium, Cr(VI) ions by photoreduction. To crystallize the oxide film, the as-anodized Fe-ZNTs were subjected to annealing at 500 °C for 3 h in a tube furnace. The morphology and crystal structure of the annealed Fe-ZNTs were analyzed using Field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD), respectively. The surface functional groups and surface chemical of the samples were analyzed by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), respectively. The formation of hollow structure of the Fe-ZNT was validated by High-resolution transmission electron microscopy (HRTEM). The dimensions of the Fe-ZNTs were measured using Image J. UV-Visible spectroscopy was used to determine the Cr(VI) concentration remaining in the sample after photoreduction. From the FESEM micrographs, the diameter of the Fe-ZNTs was enlarged with higher fluoride content, while the length abruptly decreased due to excessive etching of the oxide film at oxide|electrolyte interface. The XRD results indicate the high intensity of tetragonal-ZrO2in high fluoride content after annealing. From the photocatalytic results of 30 ppm Cr(VI) under sunlight, the Fe-ZNTs synthesized in 1.0 wt% NH4F exhibited the highest Cr(VI) removal efficiency with 100 % after 5 h due to enhanced Cr(VI) adsorption and high photoactivity of tetragonal-ZrO2
Funding(s)
Ministry of Higher Education, Malaysia
Subjects
  • Anodization | Hexaval...

File(s)
research repository notification.pdf (4.4 MB)
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1
Acquisition Date
Nov 19, 2024
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