ESR Signal of Superoxide Radical Anion Adsorbed on TiO<sub>2</sub> Generated at Room Temperature

Yu, Junhua; Chen, Jingrong; Li, Chao; Wang, Xuesong; Zhang, Baowen; Ding, Huiying

doi:10.1021/jp037585e

Cited by 52 publications

(34 citation statements)

References 21 publications

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“…7 The main ROS produced during the photocatalytic process are OH˙hydroxyl radicals and O 2˙− superoxide anions. [8][9][10] Other ROS have also been proposed, such as the hydroperoxide radical, hydrogen peroxide, and singlet oxygen. 11 ROS production induces many damages to the bacterial cell, such as lipid peroxidation, 8 protein degradation, 12,13 and DNA damage, 14,15 consequently leading to cell death.…”

Section: Introductionmentioning

confidence: 99%

On the use of capillary cytometry for assessing the bactericidal effect of TiO2. Identification and involvement of reactive oxygen species

Carré

Benhamida

Peluso

et al. 2013

Photochem Photobiol Sci

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The photocatalytic antimicrobial properties of TiO2 were studied on Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa bacterial strains taken as model strains for pathogenic species mainly implied in nosocomial infections. Capillary cytometry, coupled to a double-staining method for visualizing membrane integrity as a cell viability indicator, was highlighted as a rapid, easy-to-use, and automated numeration technique for quantitative and reproducible determination of cellular viability and thus, was able to give an accurate evaluation of the bactericidal effect of UV-A photocatalysis. Cytometry also enabled the study of TiO2-bacteria interactions and aggregation in the dark as well as TiO2 cytotoxicity. Compared with the traditional agar plate cultivation method, a significatively weaker reduction in cell viability was recorded by cytometry whatever the bacteria, TiO2 concentration, and duration of the photocatalytic treatment. The mismatch between both numeration methods was attributed to: (i) the presence of mixed bacteria-TiO2 aggregates that could interfere with bacteria measurement on plates, (ii) prolonged contact of the bacteria with TiO2 during incubation, which could cause additional cytotoxic damage to the bacterial wall, and (iii) the counting of viable but non-culturable bacteria as live bacteria in cytometry, whereas they cannot grow on solid media. A more pronounced difference was observed for P. aeruginosa and S. aureus bacteria, for which 2.9 and 1.9 log10 survival reduction overestimations were measured by plate counting, respectively. Using chemiluminescence, full restoration of cell viability by controlled addition of the O2˙(-) scavenger superoxide dismutase enzyme suggests that O2˙(-) acts, in our conditions, as the main reactive oxygen species responsible for the photocatalytic attack towards the targeted bacteria.

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Section: Introductionmentioning

confidence: 99%

On the use of capillary cytometry for assessing the bactericidal effect of TiO2. Identification and involvement of reactive oxygen species

Carré

Benhamida

Peluso

et al. 2013

Photochem Photobiol Sci

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“…This was attributed to the acceptance of electron density by Ti from the carbonyl group of the TCPP, which causes a decrease in binding energy of the Ti core of the TiO 2 @GNPs nanostructure . This change can be assigned to weak chemisorptions …”

Section: Resultsmentioning

confidence: 99%

Fabrication of a Graphene@TiO₂@Porphyrin Hybrid Material and Its Photocatalytic Properties under Simulated Sunlight Irradiation

Bhosale

Jones

et al. 2017

ChemistrySelect

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The fabrication of a nanostructured graphene@TiO2@porphyrin composite was achieved via surfactant‐assisted self‐assembly. The obtained nanostructures were fully characterized by UV‐vis, fluorescence emission spectroscopy, SEM, XRD and FTIR techniques. The graphene@TiO2@porphyrin composite reveals good incorporation of TiO2 particles with a diameter of 15–30 nm, and aggregated porphyrin nanorods with 50–60 nm width and several hundreds of nanometers in length on the graphene surface. The applications of three components (graphene@TiO2@porphyrin) based nanostructure in photocatalytic pollutant degradation Rhodamine B is reported, where TiO2 and porphyrin aggregates are shown to be activated for UV and visible light respectively, resulting in a high performing composite. The possible photocatalytic mechanism of RhB degradation by graphene@TiO2@porphyrins composite is discussed.

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“…2 , may have significant stability at room temperature (Yu et al 2004). These reactive intermediates contain unpaired electrons and their generation can therefore be monitored by electron paramagnetic resonance using N-oxide spin trapping agents such as 5,5-dimethyl-1-pyrroline N-oxide (DMPO) or 4-pyridyl-1-oxide-N-tert-butylnitrone (POBN) as indicator (Schwarz et al 1997;Brežová et al 2009).…”

Section: Paramagnetic Resonance Methodsmentioning

confidence: 99%

Mechanistic Principles of Photocatalytic Reaction

Gaya¹

2013

Heterogeneous Photocatalysis Using Inorganic Semiconductor Solids

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As developments in semiconductor photocatalysis flourish, profound success is being recorded in the elucidation of reactivity vis-à-vis mechanism. The mechanism of photocatalytic reactions lies between two limits. From viewpoint of photochemical kinetics, the reaction mechanism will be controlled by the properties of light and consequences of light absorption. However as mass transfer dominates, the process will be controlled by the non-catalytic diffusion mechanism. This chapter highlights both diffusion and photocatalytically controlled kinetics in semiconductor-based heterogeneous regimes. In the final place, some conventional analytical methods for validation of photocatalytic reaction mechanism are discussed.

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ESR Signal of Superoxide Radical Anion Adsorbed on TiO₂ Generated at Room Temperature

Cited by 52 publications

References 21 publications

On the use of capillary cytometry for assessing the bactericidal effect of TiO2. Identification and involvement of reactive oxygen species

On the use of capillary cytometry for assessing the bactericidal effect of TiO2. Identification and involvement of reactive oxygen species

Fabrication of a Graphene@TiO₂@Porphyrin Hybrid Material and Its Photocatalytic Properties under Simulated Sunlight Irradiation

Mechanistic Principles of Photocatalytic Reaction

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ESR Signal of Superoxide Radical Anion Adsorbed on TiO2 Generated at Room Temperature

Cited by 52 publications

References 21 publications

On the use of capillary cytometry for assessing the bactericidal effect of TiO2. Identification and involvement of reactive oxygen species

On the use of capillary cytometry for assessing the bactericidal effect of TiO2. Identification and involvement of reactive oxygen species

Fabrication of a Graphene@TiO2@Porphyrin Hybrid Material and Its Photocatalytic Properties under Simulated Sunlight Irradiation

Mechanistic Principles of Photocatalytic Reaction

Contact Info

Product

Resources

About

ESR Signal of Superoxide Radical Anion Adsorbed on TiO₂ Generated at Room Temperature

Fabrication of a Graphene@TiO₂@Porphyrin Hybrid Material and Its Photocatalytic Properties under Simulated Sunlight Irradiation