Green Synthesized Palladium Coated Titanium Nanotube Arrays for Simultaneous Azo-Dye Degradation and Hydrogen Production

In this study, electrodes of titanium dioxide nanotube arrays (TNAs) were successfully synthesized by applying the anodic oxidation etching method, as well as the use of green synthetic technology to add reducing agents of tea or coffee to reduce metal palladium from palladium chloride. Synthesis of...

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Bibliographic Details
Published in:Catalysts 2020-11, Vol.10 (11), p.1330
Main Authors: Lin, Yuan-Chung, Chen, Chia-Hung, Chen, Kang-Shin, Peng, Yen-Ping, Lin, Yung-Chang, Huang, Shih-Wei, Huang, Chien-Er, Lai, Hsiao-Wu, Li, Hsing-Wang
Format: Article
Language:English
Subjects:
Anodizing
Arrays
Catalysts
Catalytic oxidation
Chemical reactions
Coffee
Electrochemistry
Electromagnetic absorption
Electron paramagnetic resonance
Environmental impact
green synthesis
Hydrogen production
Hydroxyl radicals
Light
Metals
Nanoparticles
Nanotubes
Oxidation
Palladium
Photoelectric effect
Photoelectric emission
photoelectrochemical system
Photoelectrons
Pollutants
Quantum dots
Reducing agents
Silver chloride
Surface structure
Synthesis
Tea
Titanium
Titanium dioxide
titanium dioxide nanotube arrays
Wastewater
X ray photoelectron spectroscopy
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Summary:In this study, electrodes of titanium dioxide nanotube arrays (TNAs) were successfully synthesized by applying the anodic oxidation etching method, as well as the use of green synthetic technology to add reducing agents of tea or coffee to reduce metal palladium from palladium chloride. Synthesis of palladium modified TNAs (Pd/TNAs) was conducted by the microwave hydrothermal method after the metal palladium was reduced. In order to identify the surface structure, light absorption and elemental composition, TNAs and Pd/TNAs were characterized by X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). Furthermore, to test the photocurrent density, electron resistance, and hydroxyl radicals by I-t plot, electrochemistry impedance spectroscopy (EIS), and electron paramagnetic resonance (EPR) were investigated. The photocurrent (4.0 mA/cm2) of Pd/TNAs-C (using coffee as the reducing agent) at +1.0 V (vs. Ag/AgCl) was higher than that of the pure TNAs (1.5 mA/cm2), illustrating that Pd/TNAs-C can effectively separate photogenerated electrons and holes. Pd/TNAs is a favorable material as a photoanode for the photoelectrochemical (PEC) removal of organic pollutants in wastewater.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal10111330