Visible light photoactive titanium dioxide aqueous colloids and coatings

Łabuz, Przemysław; Sadowski, Rafał; Stochel, Grażyna; Macyk, Wojciech

doi:10.1016/j.cej.2013.06.079

Cited by 27 publications

(17 citation statements)

References 25 publications

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“…Sunscreens, specifically those enabled with TiO 2 ENMs are proportionally dominant NEPs across global markets [47,54,61,66] and are a top priority source of nanopollution into water systems due to the ease at which they can emit ENMs based on the loci of ENMs and their market domination [17,23,24]. Titanium oxide (TiO 2 ) ENMs are amongst the most produced for application in NEPs such as cosmetics, sunscreens, and paints [30,57,65] and have been prioritised for considerable risk to freshwater systems [45,46] as approximately 90% of TiO 2 ENMs released into freshwater originate from sunscreens [19]. Sunscreens are most frequently incorporated with TiO 2 ENMs [22,61,66] as the ENMs are highly effective UV filters thus offering enhanced protection against sunlight effects relative to bulk counterparts [12].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of titanium oxide nanomaterials in sunscreens obtained by extraction and release exposure scenarios

et al. 2019

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The application of titanium oxide engineered nanomaterials (TiO 2 ENMs) in products is dominant in sunscreens and can be released into water systems with relative ease during sunscreen use. The current study examined the physicochemical properties of the TiO 2 ENMs extracted from three sunscreens (SUN A, B, and C) and also released during bathing into deionised and tap water. The TiO 2 ENMs were identified in all the sunscreen extract samples using scanning and transmitting electron microscopy (SEM and TEM). The mode length of the ENMs measured with SEM were 67.6, 69.8, and 51.8 nm for SUN A, B, and C respectively whereas their width were 31.3, 38.7, and 27.7 nm. From TEM analysis the ENMs length and width mode sizes respectively were 73.9 and 14.5 nm for SUN A, 81.5 and 16.3 nm for SUN B, and 44.7 and 14.0 nm for SUN C. The Ti content of the sunscreens was 1.9, 0.6, and 0.5% w/w respectively for SUN A, B, and C. During bathing TiO 2 ENMs were released into wastewater and were in the size range of 47-218, 102-153, and 92-138 nm for SUN A, B, and C respectively in DI wastewater. In tap wastewater they were 100-241, 100-477, and 67-150 nm SUN A, B, and C respectively. The determined environmental concentrations for the ENMs in DI wastewater ranged 0.2-1.16 µg/L, whereas in tap wastewater it was 0.16-0.17 µg/L. The morphologies of the extracted and released ENMs were a mixture of rods, plates, irregular, and near spherical. The released Ti quantity significantly differed between DI and tap wastewater for SUN B and C, indicating the influence of wastewater quality in the exposure profile of ENMs in water systems.

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Section: Introductionmentioning

confidence: 99%

Characterisation of titanium oxide nanomaterials in sunscreens obtained by extraction and release exposure scenarios

et al. 2019

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“…Upon visible light irradiation (λ > 420 nm), ROS are generated in the close vicinity of the modified nanocrystals. Moreover, such modification by hydrophilic compounds such as rutin or tiron (disodium 4,5-dihydroxy-1,3-benzenedisulfonate) leads to the formation of highly dispersed and stable colloidal solutions [308]. The addition of H2O2 in millimolar or submillimolar concentrations may significantly improve the photoactivity of such nanomaterials and lead to a more efficient hydroxyl radical generation by one-electron reduction of H2O2.…”

Section: Photosensitized Tio2 Systemsmentioning

confidence: 99%

“…In particular, nanocrystalline TiO2 may be photosensitized by binding organic compounds to form colored surface titanium(IV) complexes [291,308]. A particularly interesting system was achieved by adsorption of rutin (quercetin-3-O-rutinoside, a flavonoid glycoside) on nanocrystalline TiO2, both anatase and rutile.…”

Section: Photosensitized Tio2 Systemsmentioning

confidence: 99%

Mechanistic studies on versatile metal-assisted hydrogen peroxide activation processes for biomedical and environmental incentives

Oszajca

Brindell

Orzeł

et al. 2016

Coordination Chemistry Reviews

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“…Moreover, because of the size of the material, optical sensitivity and activity can be changed from the ultraviolet (UV) to the visible region of light [34]. Many applications of TiO 2 in photovoltaics, photocatalysis, and antimicrobial therapy are a result of the optical properties of TiO 2 nanomaterials [35][36][37][38]. Unfortunately, titanium dioxide has a relatively wide bandgap and thus can absorb only light at λ < 400 nm, which may be intrinsically carcinogenic [39].…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Nanocrystalline TiO2 Materials with Sulfonated Porphyrins for Visible Light Antimicrobial Therapy

et al. 2019

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Highly-active, surface-modified anatase TiO2 nanoparticles were successfully synthesized and characterized. The morphological and optical properties of the obtained (metallo)porphyrin@qTiO2 materials were evaluated using absorption and fluorescence spectroscopy, scanning electron microscopy (SEM) imaging, and dynamic light scattering (DLS). These hybrid nanoparticles efficiently generated reactive oxygen species (ROS) under blue-light irradiation (420 ± 20 nm) and possessed a unimodal size distribution of 20–70 nm in diameter. The antimicrobial performance of the synthetized agents was examined against Gram-negative and Gram-positive bacteria. After a short-term incubation of microorganisms with nanomaterials (at 1 g/L) and irradiation with blue-light at a dose of 10 J/cm2, 2–3 logs of Escherichia coli, and 3–4 logs of Staphylococcus aureus were inactivated. A further decrease in bacteria viability was observed after potentiation photodynamic inactivation (PDI), either by H2O2 or KI, resulting in complete microorganism eradication even when using low material concentration (from 0.1 g/L). SEM analysis of bacteria morphology after each mode of PDI suggested different mechanisms of cellular disruption depending on the type of generated oxygen and/or iodide species. These data suggest that TiO2-based materials modified with sulfonated porphyrins are efficient photocatalysts that could be successfully used in biomedical strategies, most notably, photodynamic inactivation of microorganisms.

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Visible light photoactive titanium dioxide aqueous colloids and coatings

Cited by 27 publications

References 25 publications

Characterisation of titanium oxide nanomaterials in sunscreens obtained by extraction and release exposure scenarios

Characterisation of titanium oxide nanomaterials in sunscreens obtained by extraction and release exposure scenarios

Mechanistic studies on versatile metal-assisted hydrogen peroxide activation processes for biomedical and environmental incentives

Surface Modification of Nanocrystalline TiO2 Materials with Sulfonated Porphyrins for Visible Light Antimicrobial Therapy

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