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Vinh, Tran Quang
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article
Study on the photoelectrocatalytic activity of reduced TiO<sub>2</sub> nanotube films for removal of methyl orange
Abstract
<jats:title>Abstract</jats:title><jats:p>The reduced TiO<jats:sub>2</jats:sub> film on which a photoelectrocatalytic (PEC) process had occurred was created from TiO<jats:sub>2</jats:sub> nanotube film electrodes by the electrochemical reduction method. The obtained samples’ structure and morphology were characterized using UV-Vis diffuse reflectance spectroscopy, scanning electron microscopy, high-resolution transmission electron microscopy, photoluminescence, and X-ray diffraction. Cyclic voltammetry, linear sweep voltammetry, electrochemical impedance spectroscopy, chronoamperometry, UV-Vis absorbance spectroscopy, and Mott–Schottky plots were employed to examine the electrochemical and photoelectrochemical activities of the prepared electrodes. The results showed that the optimal conditions of cathodic polarization were a potential of −1.4 V for 60 min. The reduced TiO<jats:sub>2</jats:sub> nanotube film electrode had better photoelectrochemical activities than pristine TiO<jats:sub>2</jats:sub> under UV light due to the higher photocurrent density (13.7 mA‧cm<jats:sup>−2</jats:sup>) at 1.5 V (vs Ag/AgCl, sat. KCl reference electrode) compared to pristine TiO<jats:sub>2</jats:sub> achieving 7.3 mA‧cm<jats:sup>−2</jats:sup>, indicating more effective charge separation and transport. The degradation of methyl orange (MO) on pristine TiO<jats:sub>2</jats:sub> and reduced TiO<jats:sub>2</jats:sub> electrodes was carried out in electrocatalytic (EC) and PEC conditions. The PEC process on the reduced TiO<jats:sub>2</jats:sub> electrode had the highest MO processing efficiency (98.4%), and the EC process for MO removal on reduced TiO<jats:sub>2</jats:sub> had higher efficiency (95.1%) than the PEC process on pristine TiO<jats:sub>2</jats:sub> (89.2%).</jats:p>