Enhanced Bactericidal Activity of Modified Titania in Sunlight against Pseudomonas aeruginosa, a Water‐Borne Pathogen
Abstract
Photocatalyst‐mediated inactivations generate reactive oxygen species and OH radicals, which induce oxidative destruction of membrane integrity, causing damage to membrane phospholipids of gram negative bacteria like Pseudomonas aeruginosa. Nanosized TiO 2 was synthesized by gel to crystalline conversion and Zr‐doped TiO 2 was synthesized by pulverization using appropriate precursor. The doped nanocrystals retained the anatase phase with a marginal increase in crystallite size, averaging at 25 nm. SEM–EDX analysis of the doped sample depicts the substantial growth of grain size with 1.33 atomic weight % of zirconium. The created electron states in the doped sample act as charge carrier traps suppressing recombination which later detraps the same to the surface of the catalyst causing enhanced interfacial charge transfer. Zr‐doped TiO 2 at the molecular scale exhibits better photocatalytic activity with lower bandgap energy that can respond to visible light. The redshift caused by the dopants in absorption spectra of TiO 2 facilitated the nonintrinsic sample to exhibit nearly 2‐fold enhancement of photoinactivation in sunlight. Extent of photoinactivation of P. aeruginosa was observed to be complete (100%) within 150 min of sunlight exposure in the presence of modified TiO 2.
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Photoexcited TiO2 exhibits strong bactericidal activity and genotoxicity on various cells mostly as result of oxidative stress.
“Photoexcited TiO 2 exhibits strong bactericidal activity (191)(192)(193)(194) and genotoxicity (195)(196)(197)(198) on various cells as mostly the result of oxidative stress.”
From Photoinduced Damage to Cellular DNA: Direct and Photosensitized Reactions<sup>†</sup> (2012) · cites this paper as [193]
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A review on the visible light active titanium dioxide photocatalysts for environmental applications
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- Authors
- Swetha, S., Santhosh, S. M., & Geetha Balakrishna, R.
- Affiliations
- Jain University (IN)
- ORCID
- Swetha, S.
- Venue
- Photochemistry and Photobiology
- Publisher
- Wiley
- Published
- 2010-07-28
- Volume
- 86
- Issue
- 5
- Pages
- 1127-1134
- ISSN
- 0031-8655 (ISSN-L)
- 1751-1097
- OpenAlex
- W2032797621
- Cited by
- 28
- References
- 31
- Citations by year
- 2026: 1 · 2023: 3 · 2020: 2 · 2019: 1 · 2018: 4 · 2017: 1 · 2016: 2 · 2015: 1 · 2014: 6 · 2012: 3
- FWCI
- 1.05
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Photochemistry and Photobiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
- Physical Sciences › Materials Science › Materials Chemistry › Nanoparticles: synthesis and applications
- Keywords
- photocatalytic inactivation, Pseudomonas aeruginosa, solar photocatalysis, waterborne pathogens, reactive oxygen species, anatase nanocrystals, charge trapping, interfacial charge transfer, visible light absorption, band gap red shift, bacterial membrane disruption
- MeSH terms
- Anti-Bacterial Agents, Fresh Water, Light, Pseudomonas aeruginosa, Titanium, Photosensitizing Agents, Reactive Oxygen Species
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