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Highly-Organized One-Dimensional Copper-Doped Titanium Dioxide Nanotubes for Photoelectrocatalytic Degradation of Acid Orange 52

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Abstract:

Highly-organized one-dimensional arrays of copper-doped titanium dioxide nanotubes (Cu-TiNTs) were synthesized in a one-pot approach by double anodization of titanium sheets. Field-emission scanning electron microscopy showed that Cu-TiNTs have an average inner diameter of 52.13 nm, a wall thickness of 14.28 nm, and a tube length of 0.6401 μm. Fourier-transform infrared spectroscopy confirmed the presence of characteristic O-Ti-O bond of TiO2. X-ray fluorescence spectroscopy confirmed copper-doping with an average dopant loading of 0.0248%. Even at this low dopant loading, Cu-TiNTs were shown to be photo-active in degrading Acid Orange 52 (AO 52) under UV light illumination. The kinetic profiles of AO 52 photoelectrochemical degradation were best described by the pseudo-first-order kinetic model (R2 ≥ 0.991) with kinetic constants 9.42 x 10-3 min-1 for Cu-TiNTs as compared to 6.04 x 10-3 min-1 for pristine TiNTs. Overall, doping pristine TiNTs with Cu was shown to enhance its photoelectrocatalytic properties in degrading textile dyes such as AO 52.

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Periodical:

Key Engineering Materials (Volume 801)

Pages:

285-291

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.801.285

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Online since:

May 2019

Authors:

Edgar Clyde R. Lopez*, Vince Aron F. Cleofe, Rio Ysabel A. Cañal, Kristoffer Francis P. Boado, Jem Valerie D. Perez

Keywords:

Acid Orange 52, Anodization, Cu-Doped TiO2 Nanotubes, Photoelectrocatalysis

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© 2019 Trans Tech Publications Ltd. All Rights Reserved

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