Plasma Enhanced Wet Chemical Surface Activation of TiO2 for the Synthesis of High Performance Photocatalytic Au/TiO2 Nanocomposites

To enhance the effectiveness of TiO2 as a photocatalyst, it was believed that the drawbacks of the large bandgap and the rapid electron-hole recombination can be overcome by coupling TiO2 with plasmonic metal nanoparticles. The incorporation of the nanoparticles onto the TiO2 surface requires a suit...

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Bibliographic Details
Published in:Applied sciences 2020-05, Vol.10 (10), p.3345
Main Authors: Thi Thu Thuy, Nguyen, Hoang Tung, Do, Hong Manh, Le, Kim, Joon Heon, Kudryashov, Sergey Ivanovich, Hong Minh, Pham, The Hien, Nguyen
Format: Article
Language:English
Subjects:
Activation
Ammonia
Au/TiO2 nanocomposite
Diamonds
Electrodes
Gold
Holes (electron deficiencies)
Hydrogen peroxide
Methylene blue
Nanocomposites
Nanomaterials
Nanoparticles
noble metal based photocatalyst
Photocatalysis
Plasma
plasma-liquid interaction
Recombination
sunlight degradation
Surface activation
Surface treatment
Titanium dioxide
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Summary:To enhance the effectiveness of TiO2 as a photocatalyst, it was believed that the drawbacks of the large bandgap and the rapid electron-hole recombination can be overcome by coupling TiO2 with plasmonic metal nanoparticles. The incorporation of the nanoparticles onto the TiO2 surface requires a suitable procedure to achieve the proper particle adhesion. In this work, we propose a simple, clean, and effective surface activation of TiO2 using plasma enhanced wet chemical surface treatment. Under only 5 min of plasma treatment in a 3% NH3/3% H2O2 solution, gold nanoparticles were found better adhered onto the TiO2 surface. Hence, the methylene blue degradation rate of the Au/TiO2 under sunlight treated was improved by a factor of 3.25 times in comparison to non-treated Au/TiO2 and by 13 times in comparison to the bare rutile TiO2.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10103345