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Open AccessArticle

Electrocatalytic Degradation of Azo Dye by Vanadium-Doped TiO2 Nanocatalyst

1
Department of Environmental Engineering and Management, Chaoyang University of Technology, 168 Jifeng E. Rd., Wufeng District, Taichung 41349, Taiwan
2
Department of Civil Environmental and Construction Engineering, Texas Tech University, 2500 Broadway, Lubbock, TX 79409, USA
3
Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, 142, Haijhuan Rd., Nanzih District, Kaohsiung 81157, Taiwan
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(5), 482; https://doi.org/10.3390/catal10050482
Received: 6 March 2020 / Revised: 25 April 2020 / Accepted: 27 April 2020 / Published: 28 April 2020
In this work, nano V/TiO2 catalysts at different molar ratios were prepared and fabricated as the electrocatalytic electrodes for electrocatalytic degradation. The effect of the vanadium doping on the surface morphology, microstructural, and specific surface area of V/TiO2 catalysts was probed by field emission scanning electron microscope (FESEM) x-ray diffractometer (XRD), and Brunauer–Emmett–Teller (BET), respectively. Afterward, the solution of Acid Red 27 (AR 27, one kind of azo dye) was treated by an electrocatalytic system in which the nano V/TiO2 electrode was employed as the anode and graphite as the cathode. Results demonstrate that AR 27 can be effectively degraded by the nano V/TiO2 electrodes; the highest removal efficiency of color and total organic carbon (TOC) reached 99% and 76%, respectively, under 0.10 VT (molar ratio of vanadium to titanium) condition. The nano V/TiO2 electrode with high specific surface area facilitated the electrocatalytic degradation. The current density of 25 mA cm−2 was found to be the optimum operation for this electrocatalytic system whereas the oxygen was increased with the current density. The electricity consumption of pure TiO2 and nano V/TiO2 electrode in this electrocatalytic system was around 0.11 kWh L−1 and 0.02 kWh L−1, respectively. This implies that the nano V/TiO2 electrode possesses both high degradation and energy saving features. Moreover, the nono V/TiO2 electrode shows its possible repeated utilization. View Full-Text
Keywords: dye wastewater; electrocatalyst; titanium dioxide; vanadium-doped dye wastewater; electrocatalyst; titanium dioxide; vanadium-doped
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MDPI and ACS Style

Chang, J.-H.; Wang, Y.-L.; Dong, C.-D.; Shen, S.-Y. Electrocatalytic Degradation of Azo Dye by Vanadium-Doped TiO2 Nanocatalyst. Catalysts 2020, 10, 482.

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