Coupling of narrow and wide band-gap semiconductors on uniform films active in bacterial disinfection under low intensity visible light: Implications of the interfacial charge transfer (IFCT)

Rtimi, Sami; Sanjinés, R.; Pulgarín, C.; Houas, Ammar; Lavanchy, J.-C.

doi:10.1016/j.jhazmat.2013.06.019

Cited by 32 publications

(14 citation statements)

References 23 publications

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“…However, in the presence of AgNPs-TiO 2 tiles under light, a significant inactivation of E. coli that increases as a function of light intensity increases. This justifies the semiconductor behaviour of the Ag-species at the interface with bacteria [16,27,28]. Thus, these results indicate that the inactivation of E. coli is a light-dependent reaction owing to the formation of ROS on the surface of AgNPs-TiO 2 .…”

Section: E Coli Inactivation Under Different Solar Light Intensitiessupporting

confidence: 73%

Digitally Printed AgNPs Doped TiO2 on Commercial Porcelain-Grès Tiles: Synergistic Effects and Continuous Photocatalytic Antibacterial Activity

et al. 2020

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In the present study, we use commercial digitally printed ceramic tiles, functionnalized by AgNPs doped micro–TiO2, to investigate the mechanism of Ag in the continouos photocatalytic antibacterial activity. The novelty of the research lies in the attempt to understand the mechanism of Ag, supported on TiO2, able to exhibit the same antibacterial activity of a standard system containing Ag species, but here, totally embedded on the tile surface, and thus not free to move and damage the bacteria cell. UV/vis diffuse reflectance spectroscopy (DRS) of AgNPs–TiO2 tiles indicated an enhanced visible light response, wherein a new absorption band was produced around 18,000–20,000 cm−1 (i.e., in the 400–600 nm range) owing to the surface plasmon resonance (SPR) of AgNPs. The antibacterial photocatalytic experiments were conducted towards the inactivation of E. coli under solar light and indoor light. It was found that the degradation speed of E. coli in the presence of AgNPs–TiO2 tiles is solar light-intensity depending. This justifies the semiconductor behavior of the material. Furthermore, the AgNPs–TiO2 tiles exhibit a high ability for the inactivation of E. coli at a high load (104–107 colony-forming unit (CFU)/mL). Additionally, AgNPs–TiO2 tiles showed a remarkable antibacterial activity under indoor light, which confirms the good photocatalytic ability of such tiles. On the basis of the reactive oxygen species (ROS) quenching experiments, O2•− species and h+ were more reactive for the inactivation of E. coli rather than •OH species. This is because of the different lifetime (bacteria are more likely oxidized by ROS with longer lifetime); in fact, O2•− and h+ exhibit a longer lifetime compared with •OH species. The generation of H2O2 as the most stable ROS molecule was also suggested.

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Section: E Coli Inactivation Under Different Solar Light Intensitiessupporting

confidence: 73%

Digitally Printed AgNPs Doped TiO2 on Commercial Porcelain-Grès Tiles: Synergistic Effects and Continuous Photocatalytic Antibacterial Activity

et al. 2020

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“…It must be pointed that in contrasat to methanol dehydrogenation, decomposition of acetic acid was performed under aerobic conditions, and thus it is highly probable that less noble metals (Ag and Cu) existed mainly in their oxide forms. Therefore, it is proposed that the heterojunction between two/three oxides, i.e., titania and CuO/Cu 2 O and titania and Ag 2 O/AgO, could result in inhibition of the recombination of charge carriers, as has already been reported for such coupled semiconductors [68], [69], [88], [89].…”

Section: Resultsmentioning

confidence: 82%

Noble metal-modified octahedral anatase titania particles with enhanced activity for decomposition of chemical and microbiological pollutants

Wei

Endo

Wang

et al. 2017

Chemical Engineering Journal

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“…Similar heterojunctions between titania and CuO, Cu 2 O, Ag 2 O, and AgO have already been proposed for inhibition of the recombination of charge carriers. 53,81,84,92 It is also possible that heterojunction CuO∕Cu 2 O-TiO 2 is less active than metal-modified titania Ag∕TiO 2 or Ag-AgO∕TiO 2 . (Copper exists mainly in oxidized form, but silver coexists in metallic and oxidized form.)…”

Section: Characterization Of Ag-and Cu-modified Dapmentioning

confidence: 99%

Silver- and copper-modified decahedral anatase titania particles as visible light-responsive plasmonic photocatalyst

et al. 2016

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Silverand coppermodified decahedral anatase titania particles as visible light-responsive plasmonic photocatalyst,"Abstract. Decahedral anatase particles (DAPs) with eight equivalent (101) facets and two (001) facets were prepared by the gas-phase process. Monometallic and bimetallic photocatalysts were prepared by photodeposition of silver and copper on DAP. It was found that the method of metal deposition (sequential/simultaneous) is crucial for resultant properties and thus for photocatalytic performance. The fastest hydrogen evolution during metal deposition was observed for copper deposited on premodified DAP with silver (DAP/Ag/Cu), probably due to partial coverage of silver with fine clusters of Cu and thus facilitation of proton adsorption and reduction on well-dispersed Cu nanoclusters. Although DAP/Ag/Cu exhibited the fastest rate of hydrogen evolution, single-modified DAP with silver exhibited the best performance for oxidative decomposition of organic compounds under vis irradiation. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Coupling of narrow and wide band-gap semiconductors on uniform films active in bacterial disinfection under low intensity visible light: Implications of the interfacial charge transfer (IFCT)

Cited by 32 publications

References 23 publications

Digitally Printed AgNPs Doped TiO2 on Commercial Porcelain-Grès Tiles: Synergistic Effects and Continuous Photocatalytic Antibacterial Activity

Digitally Printed AgNPs Doped TiO2 on Commercial Porcelain-Grès Tiles: Synergistic Effects and Continuous Photocatalytic Antibacterial Activity

Noble metal-modified octahedral anatase titania particles with enhanced activity for decomposition of chemical and microbiological pollutants

Silver- and copper-modified decahedral anatase titania particles as visible light-responsive plasmonic photocatalyst

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