Nanostructured TiO2 cavitation agents for dual-modal sonophotocatalysis with pulsed ultrasound
| Autor: | Xq Su, Umesh Sai Jonnalagadda, James J. Kwan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Acoustics and Ultrasonics HIFU high intensity focused ultrasound QC221-246 Nanoparticle 02 engineering and technology 010402 general chemistry TFNs TiO2 fractured nanoshells PSD power spectral density 01 natural sciences Chemical reaction Inorganic Chemistry Reaction rate chemistry.chemical_compound ROS reactive oxygen species Sonoluminescence Sonophotocatalysis Chemical Engineering (miscellaneous) Environmental Chemistry Radiology Nuclear Medicine and imaging Original Research Article MB methylene blue QD1-999 ComputingMethodologies_COMPUTERGRAPHICS Cavitation nuclei Organic Chemistry Acoustics. Sound PCD passive cavitation detector Titanium dioxide nanoparticles 021001 nanoscience & nanotechnology 0104 chemical sciences Chemistry Chemical engineering chemistry Pulsed ultrasound Cavitation Titanium dioxide DPBF 1 3-diphenylisobenzofuran Photocatalysis Light emission XRD X-ray diffraction 0210 nano-technology |
| Zdroj: | Ultrasonics Sonochemistry, Vol 73, Iss, Pp 105530-(2021) Ultrasonics Sonochemistry |
| ISSN: | 1350-4177 |
| Popis: | Graphical abstract Highlights • Current sonochemical methods using stochastic cavitation are inefficient. • Nanostructured photocatalyst as sonophotocatalyst for site-controlled cavitation. • Site-controlled cavitation activates sonophotocatalyst at lower acoustic pressures. • Reaction kinetics show model dye degradation 1000-fold faster than other methods. • Sonophotocatalyst demonstrates an efficient, sustainable avenue for sonochemistry. Current sonochemical methods rely on spatially uncontrolled cavitation for radical species generation to promote chemical reactions. To improve radical generation, sonosensitizers have been demonstrated to be activated by cavitation-based light emission (sonoluminescence). Unfortunately, this process remains relatively inefficient compared to direct photocatalysis, due to the physical separation between cavitation event and sonosensitizing agent. In this study, we have synthesized nanostructured titanium dioxide particles to couple the source for cavitation within a photocatalytic site to create a sonophotocatalyst. In doing so, we demonstrate that site-controlled cavitation from the nanoparticles using pulsed ultrasound at reduced acoustic powers resulted in the sonochemical degradation methylene blue at rates nearly three orders of magnitude faster than other titanium dioxide-based nanoparticles by conventional methods. Sonochemical degradation was directly proportional to the measured cavitation produced by these sonophotocatalysts. Our work suggests that simple nanostructuring of current sonosensitizers to enable on-site cavitation greatly enhances sonochemical reaction rates. |
| Databáze: | OpenAIRE |
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