Enhancement of the Catalytic Ozonation Process by Using TiO2/ZrO2 Nanoparticles
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 28, Issue 4
Abstract
In this study, we employed synthesized titanium oxide/zirconium oxide (TiO2/ZrO2) nanoparticles as activated catalysts to enhance the ozonation process during hydroxyl radical (OH°) generation using atrazine (ATZ) as a pollutant. The TiO2/ZrO2 nanoparticles were synthesized using the coprecipitation digestion method and were characterized using scanning and transmission electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller theory, and energy dispersive X-ray spectroscopy. The experiments were conducted under different initial pH conditions (3, 7, and 10), with an initial ATZ concentration of 4.64 × 10−6 M, initial TiO2/ZrO2 nanocatalyst concentrations of 100, 200, and 300 ppm, and initial ozone (O3) concentrations of 1.35 × 10−4, 1.55 × 10−4, and 2.27 × 10−4 M, respectively. The key operational parameters were optimized, and the optimal OH° results were obtained at pH 10, 200 ppm TiO2/ZrO2 concentration, 4.64 × 10−6 M ATZ concentration, and 1.55 × 10−4 M O3 concentration. The potential of TiO2/ZrO2 nanoparticles to enhance OH° generation during catalytic ozonation was demonstrated. The catalytic ozonation mechanism using TiO2/ZrO2 nanoparticles was governed by the optimal formation of OH° radicals at about 1 × 10−11 mol/L and an excellent nanocatalytic activity with an Rct value of 2.83 × 10−8.
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Data Availability Statement
All data, models, and codes generated or used in the study appear in the published article.
Acknowledgments
The authors thank the Vietnam Academy of Science and Technology (VAST) for its financial support under project number ĐLTE00.07/19-20 and the Vietnam National Foundation for Science and Technology Development (NAFOSTED) under the funded research Project Number 105.99-2018.18.
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Published In
Journal of Hazardous, Toxic, and Radioactive Waste
Volume 28 • Issue 4 • October 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Sep 13, 2023
Accepted: Jan 2, 2024
Published online: Jun 4, 2024
Published in print: Oct 1, 2024
Discussion open until: Nov 4, 2024
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