Photocatalytic and biocidal activities of novel coating systems of mesoporous and dense TiO2-anatase containing silver nanoparticles

Roldán, María Virginia; Oña, Paula de; Castro, Yolanda; Durán, Alicia; Faccendini, Pablo Luis; Lagier, Claudia M.; Grau, Roberto; Pellegri, N.

doi:10.1016/j.msec.2014.07.053

Cited by 36 publications

(28 citation statements)

References 67 publications

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“…In Ag-SiO 2 /TiO 2 system, only some silver nanoparticles on the top of SiO 2 layer are in contact with the semiconductor thus being less influenced by this mechanism. The same behaviour was observed in mesoporous samples [52].…”

Section: Photocatalytic Characterisation Of Ag-doped Coatingssupporting

confidence: 82%

“…In one previous work [52], we found a clear relationship between the architecture of the multilayer coatings and the photocatalytic and bactericide behaviour. The aim of this work was to study the influence of the parameters involved in the synthesis of TiO 2 sols doped with Ag-NPs along with the effect of different SiO 2 /TiO 2 coating architectures on the photocatalytic efficiency of the systems.…”

Section: Introductionmentioning

confidence: 55%

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Enhanced photocatalytic activity of mesoporous SiO2/TiO2 sol–gel coatings doped with Ag nanoparticles

Roldán

Castro

Pellegri

et al. 2015

J Sol-Gel Sci Technol

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In the present study, as-prepared silver nanoparticles have been incorporated into SiO 2 and TiO 2 sols. The characterisation of the silver nanoparticles was performed through transmission electron microscopy, grazing X-ray diffraction, and UV-visible spectroscopy, before and after mixing with the different sols. Multilayer coatings doped with silver nanoparticles were also prepared by combining different compositions and analysed by TEM and GXRD. The photocatalytic activity was studied through the degradation of methyl orange in aqueous solution under UV light exposure. High photocatalytic efficiency was observed for all the multilayer coatings. The highest efficiency was obtained for the Ag-SiO 2 /TiO 2 mesoporous system that reached a degradation percentage of methyl orange up to 94 % after 2.5 h of irradiation, near the complete elimination of the pollutant. The mechanism that explains the high photocatalytic efficiency of this multilayer coating is associated with the high porosity of the mesoporous coatings and with the increase in the local electric field, associated with the effect of plasmon resonance surface produced for the presence of metallic silver nanoparticles in the SiO 2 film.

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Section: Photocatalytic Characterisation Of Ag-doped Coatingssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 55%

Enhanced photocatalytic activity of mesoporous SiO2/TiO2 sol–gel coatings doped with Ag nanoparticles

Roldán

Castro

Pellegri

et al. 2015

J Sol-Gel Sci Technol

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“…The TiO 2 /Ag hybrid photocatalysis is applicable to a broader scope in terms of photocatalytic application (Cozzoli et al 2004, Ko 2014, Roldán et al 2014. Their photocatalytic reactivity can be efficiently utilized for selfcleaning of surfaces, water/air purifications, anti-fogging surfaces, and photovoltaics.…”

Section: Tio 2 /Ag Hybrid Photocatalytic Systemmentioning

confidence: 99%

TiO2 hybrid photocatalytic systems: impact of adsorption and photocatalytic performance

Amir

Julkapli

Yousefi³

2015

Reviews in Inorganic Chemistry

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AbstractFor the past 40 years, titanium dioxide (TiO2) nanomaterials have attracted immense attention because of their potential applications in the photodegradation of organic pollutants, photocatalytic water splitting for H2 generation, and dye-sensitized solar cells. Despite the fact that the potential applications of TiO2 nanoparticles are ubiquitous, they are not problem free, examples include a large interfacial area that causes slow charge carrier transport, a wide optical band gap that leads to limited applications using solar light, and single-phase and nanoscales features that induce fast recombination of photo-reduced carriers. Therefore, this review highlights the development associated with the adsorption photocatalysis hybrid system for treating wastewater. The immobilization of TiO2 photocatalysts in metal oxide, carbon, and ceramic materials to form TiO2 hybrid systems could prevent the problem of particle recovery, adsorption capacity, and the separation process. Such hybrid systems require significant effort of optimizing the specific surface area-to-volume ratio of the supported photocatalysts with its photocatalytic activities.

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“…In addition to antibiotic treatment, different alternative strategies have emerged to prevent or combat bacterial infections and multiresistance to antibiotics (Boucher et al, 2009;Brusselaers et al, 2011;Rold an et al, 2014;Karam et al, 2016). For example, inhibition of pathogen bacterial adhesion through vaccination with recombinant adhesins (Schennings et al, 1993;Kawabata et al, 2001) and competitive exclusion produced by probiotic bacteria (Kirjavainen et al, 1998;Ouwehand et al, 2001;Styriak et al, 2003;Buck et al, 2005Buck et al, , 2010 are suitable strategies for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Transcriptional regulation of adhesive properties of Bacillus subtilis to extracellular matrix proteins through the fibronectin‐binding protein YloA

Ayala

Bauman

Bartolini

et al. 2017

Molecular Microbiology

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Bacterial adherence to extracellular matrix proteins (ECMp) plays important roles during host-pathogen interaction, however its genetic regulation remains poorly understood. yloA of the model bacterium Bacillus subtilis shows high homology to genes encoding fibronectin-binding proteins of Gram-positive pathogens. Here, we characterized the regulatory network of YloA-dependent adhesive properties of the probiotic B. subtilis natto (Bsn). YloA-proficient, but not YloA-deficient, Bsn specifically bound to ECMp in a concentration-dependent manner and were proficient in biofilm formation. yloA expression showed a continuous increase in activity during the growth phase and decreased during the stationary phase. The transcription factors AbrB and DegU downregulated yloA expression during the logarithmic and stationary growth phases respectively. Analysis of the yloA promoter region revealed the presence of AT-rich direct and inverted repeats previously reported to function as DegU-recognized binding sites. In spo0A cells, yloA expression was completely turned off because of upregulation of AbrB throughout growth. Accordingly, DNase I footprinting analysis confirmed that AbrB bound to the promoter region of yloA. Interestingly, Bsn bound fibronectin with higher affinity, lower Kd, than several bacterial pathogens and competitively excluded them from binding to immobilized-fibronectin, a finding that might be important for the anti-infective properties of B. subtilis and its relatives.

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Photocatalytic and biocidal activities of novel coating systems of mesoporous and dense TiO2-anatase containing silver nanoparticles

Cited by 36 publications

References 67 publications

Enhanced photocatalytic activity of mesoporous SiO2/TiO2 sol–gel coatings doped with Ag nanoparticles

Enhanced photocatalytic activity of mesoporous SiO2/TiO2 sol–gel coatings doped with Ag nanoparticles

TiO2 hybrid photocatalytic systems: impact of adsorption and photocatalytic performance

Transcriptional regulation of adhesive properties of Bacillus subtilis to extracellular matrix proteins through the fibronectin‐binding protein YloA

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