Nurulhuda Bashirom
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Nurulhuda Bashirom
Official Name
Nurulhuda, Bashirom
Alternative Name
Bashirom, Nurulhuda
Bashirom, N. H.
Bashirom, Nurhuda
Bashirom, N.
Main Affiliation
Scopus Author ID
55566919700
Researcher ID
V-8232-2019

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Formation of self-organized ZrO2-TiO2and ZrTiO4-TiO2nanotube arrays by anodization of Ti-40Zr foil for Cr(VI) removal

2022-07-01 , Nurulhuda Bashirom , Tan W.K. , Kawamura G. , Matsuda A. , Lockman Z.

In this work, anodic oxidation of Ti-40 wt.% Zr alloy in EG/NH4F/H2O electrolyte was done to produce anodic self-aligned oxide nanotube arrays. The nanotubes were amorphous but upon annealing at 400° C they were crystallized into ZrO2-TiO2 nanotubes and ZrTiO4-TiO2 nanotubes at 600 °C. The nanotubes were used to reduce 60 ppm Cr(VI) ions under sunlight or UV irradiation. 100% removal of Cr(VI) was achieved on ZrTiO4-TiO2 nanotubes after 5 h of exposure to UV light but only 53% removal was obtained on ZrO2-TiO2 nanotubes. The higher photocatalytic activity of the ZrTiO4-TiO2 nanotubes can be related to the presence of the ZrTiO4 phase which has good acid-base properties as well as the junction formation between ZrTiO4 and TiO2 that can further enhance the reduction process.

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Comparison of ZrO2, TiO2, and α-Fe2O3 nanotube arrays on Cr(VI) photoreduction fabricated by anodization of Zr, Ti, and Fe foils

2020-05-01 , Nurulhuda Bashirom , Tan W.K. , Kawamura G. , Matsuda A. , Lockman Z.

This paper presents the fabrication of self-organized ZrO2, TiO2, and α-Fe2O3 nanotube arrays by anodization of Zr, Ti, and Fe foils, respectively in fluoride-containing EG electrolyte at 40 V for 20 min. The as-anodized nanotubes were annealed in a tube furnace at 400 °C for 3 h to induce the crystallization of the oxide film. Morphology, crystal structure, surface properties, and optical properties of the anodic ZrO2 nanotubes (ZNTs), TiO2 nanotubes (TNTs), and α-Fe2O3 nanotubes (FNTs) were characterized by Field-Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), Fourier-Transform Infrared (FTIR) spectroscopy, Photoluminescence (PL) spectroscopy, and UV-visible Near-Infrared Diffuse Reflectance Spectra (UV-vis NIR DRS) spectroscopy, respectively. Based on the FESEM and TEM micrographs, ZNTs possessed the longest nanotubes (i.e. 9.6 μm) compared with TNTs and FNTs under the same anodization condition. The aspect ratio of the nanotubes can be arranged in the order of ZNTs > FNTs > TNTs. The surface of the annealed ZNTs, FNTs, and TNTs was enriched with-OH groups to facilitate the Cr(VI) adsorption. According to the UV-vis NIR DRS spectra, strong visible light absorption was observed on the FNTs due to their low band gap. Whereas, the TNTs predominantly absorbs the UV light at λ max = 360 nm. Rapid Cr(VI) removal was observed on FNTs, i.e. 100% after 2 h activated by sunlight with negligible Cr(VI) removal for ZNTs and TNTs. When exposed to UVC (λ = 254 nm), only 39% versus 37% Cr(VI) removal efficiencies were obtained on TNTs and ZNTs after 3 h suggesting sluggish electron transfer due to rapid charge carriers recombination as evident in the PL spectra.

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