Environmental Remediation by an Integrated Microwave/UV-Illumination Method. 1. Microwave-Assisted Degradation of Rhodamine-B Dye in Aqueous TiO2 Dispersions
Abstract
The photocatalytic decomposition of the cationic rhodamine-B (RhB) dye was examined in aqueous TiO2 dispersions using an integrated microwave/UV-illumination (PD/MW) method. This procedure proved to be superior in the degradation of the dye than the TiO2 photocatalytic degradative method alone. With few exceptions, the integrated PD/MW method also proved superior for other chemical systems. The greater efficacy of the PD/MW technique appears to be the result of the following two considerations: (i) there is enhanced formation of reactive oxygen species (.OH radicals), as attested to by DMPO spin-trap ESR methods and their attack on the dye; and although speculative at this time, (ii) the activity of bulk water or the TiO2 particle surface is somehow affected by microwave radiation. The greater efficacy of the PD/MW degradation method was also observed at low concentrations of molecular oxygen and at low radiant excitance of the light source. A brief mechanistic description is given on the basis of results obtained on the two model compounds, (i) benzoic acid and (ii) pyronin-B dye.
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Additional defect sites on TiO2 have been generated, which can increase the transition probability of e-/h+ and decrease e-/h+ recombination on the TiO2 surface.
“Additional defect sites on TiO 2 have been generated, 139 which can increase the transition probability of e -/h + and decrease e -/h + recombination on the TiO 2 surface.”
From Sustainable hybrid photocatalysts: titania immobilized on carbon materials derived from renewable and biodegradable resources (2016) · cites this paper as [139]
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- Authors
- Horikoshi, S., Hidaka, H., & Serpone, N.
- Affiliations
- Meisei University (JP)
- Concordia University (CA)
- Corresponding author
- Hidaka, Hisao
- Serpone, Nick
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2002-02-16
- Volume
- 36
- Issue
- 6
- Pages
- 1357-1366
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W1979987292
- Cited by
- 221
- References
- 22
- Citations by year
- 2026: 2 · 2024: 3 · 2023: 3 · 2022: 6 · 2021: 7 · 2020: 9 · 2019: 15 · 2018: 6 · 2017: 9 · 2016: 6 · 2015: 9 · 2014: 12 · 2013: 12 · 2012: 11
- FWCI
- 8.46
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Research Promotion Foundation
- Natural Sciences and Engineering Research Council of Canada
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
- Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
- Keywords
- rhodamine B, dye degradation, TiO2 photocatalysis, microwave-assisted degradation, UV illumination, hydroxyl radicals, reactive oxygen species, DMPO spin trapping, benzoic acid, hypoxia, degradation mechanism
- MeSH terms
- Coloring Agents, Fluorescent Dyes, Microwaves, Oxygen, Rhodamines, Titanium, Ultraviolet Rays, Water Pollution, Hydroxyl Radical
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