Nanostructured TiO2 cavitation agents for dual-modal sonophotocatalysis with pulsed ultrasound
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 proces...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2021-05-01
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| Series: | Ultrasonics Sonochemistry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1350417721000729 |
| _version_ | 1818453957616336896 |
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| author | U.S. Jonnalagadda X Su J.J. Kwan |
| author_facet | U.S. Jonnalagadda X Su J.J. Kwan |
| author_sort | U.S. Jonnalagadda |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-14T21:47:14Z |
| format | Article |
| id | doaj.art-d13d27bff0d141d9a65dcde15a6fe124 |
| institution | Directory Open Access Journal |
| issn | 1350-4177 |
| language | English |
| last_indexed | 2024-12-14T21:47:14Z |
| publishDate | 2021-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ultrasonics Sonochemistry |
| spelling | doaj.art-d13d27bff0d141d9a65dcde15a6fe1242022-12-21T22:46:20ZengElsevierUltrasonics Sonochemistry1350-41772021-05-0173105530Nanostructured TiO2 cavitation agents for dual-modal sonophotocatalysis with pulsed ultrasoundU.S. Jonnalagadda0X Su1J.J. Kwan2School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, 637459, SingaporeSchool of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, 637459, SingaporeDepartment of Engineering Science, University of Oxford, Oxford OX1 3PJ, United Kingdom; Corresponding author.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.http://www.sciencedirect.com/science/article/pii/S1350417721000729Cavitation nucleiSonophotocatalysisPulsed ultrasoundTitanium dioxide nanoparticles |
| spellingShingle | U.S. Jonnalagadda X Su J.J. Kwan Nanostructured TiO2 cavitation agents for dual-modal sonophotocatalysis with pulsed ultrasound Ultrasonics Sonochemistry Cavitation nuclei Sonophotocatalysis Pulsed ultrasound Titanium dioxide nanoparticles |
| title | Nanostructured TiO2 cavitation agents for dual-modal sonophotocatalysis with pulsed ultrasound |
| title_full | Nanostructured TiO2 cavitation agents for dual-modal sonophotocatalysis with pulsed ultrasound |
| title_fullStr | Nanostructured TiO2 cavitation agents for dual-modal sonophotocatalysis with pulsed ultrasound |
| title_full_unstemmed | Nanostructured TiO2 cavitation agents for dual-modal sonophotocatalysis with pulsed ultrasound |
| title_short | Nanostructured TiO2 cavitation agents for dual-modal sonophotocatalysis with pulsed ultrasound |
| title_sort | nanostructured tio2 cavitation agents for dual modal sonophotocatalysis with pulsed ultrasound |
| topic | Cavitation nuclei Sonophotocatalysis Pulsed ultrasound Titanium dioxide nanoparticles |
| url | http://www.sciencedirect.com/science/article/pii/S1350417721000729 |
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