Photocatalysis and disinfection of water: Identification of potential bacterial targets

Pigeot‐Rémy, S.; Simonet, F.; Errazuriz-Cerda, E.; Lazzaroni, Jean-Claude; Atlan, Danièle; Guillard, C.

doi:10.1016/j.apcatb.2011.03.001

Cited by 147 publications

(74 citation statements)

References 50 publications

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“…Recently, we have reported the mechanism of the damage induced by TiO 2 photocatalysis on the bilayer cell-envelope of Escherichia coli in several studies [20][21][22][23]. Other groups working in the disinfection field have also addressed the mechanism of disinfection [24][25][26][27]. The E. coli and MRSA viability as a function of time was monitored by direct transfer on plate and by stereomicroscopy.…”

Section: Introductionmentioning

confidence: 99%

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

Rtimi

Pascu

Sanjinés

et al. 2013

Applied Catalysis B: Environmental

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a b s t r a c tThis study reports visible light sensitive ZrNO and ZrNO-Ag polyester samples prepared by sputtering in an Ar/N 2 /O 2 atmosphere leading to Escherichia coli bacterial inactivation. The bacterial inactivation by ZrNO avoids the increasing environmental concern involving the fate of Ag-leaching of many disinfectants. The simultaneous co-sputtering of ZrNO and Ag 2 O enhanced the E. coli bacterial inactivation kinetics compared to the sequential sputtering of ZrNO and Ag. A reaction mechanism is suggested triggered by photoinduced interfacial charge transfer (IFCT) suggesting electron injection form the Ag 2 O cb to the ZrO 2cb . The sizes of the ZrO 2 and Ag nanoparticles in the co-sputtered ZrNO-Ag were 80-130 nm and 8-15 nm respectively as determined by high angular annular dark field (HAADF) microscopy. Evidence is presented by X-ray photoelectron spectroscopy (XPS) for the self-cleaning of the photocatalysts after bacterial inactivation. This enabled a stable catalyst reuse. The XPS experimental spectra of ZrNO and ZrNO-Ag were deconvoluted into their ZrN, ZrNO and ZrO 2 components. The amounts of Ag-ions released during bacterial inactivation were < 5 ppb/cm 2 and well below the Ag cytotoxic levels. Since no cytotoxicity was introduced during the bacterial inactivation process, the ZrNO-Ag disinfection proceeds through an oligodynamic effect.

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Section: Introductionmentioning

confidence: 99%

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

Rtimi

Pascu

Sanjinés

et al. 2013

Applied Catalysis B: Environmental

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“…Among various antibacterial materials, titanium dioxide (TiO 2 ) is a promising antibacterial agent due to its low cost, good chemical stability and environmentally friendly [4,5] . It is well known that the 3 generation of destructive reactive oxygen species (ROS) under UV light irradiation plays the most important role for antibacterial efficacy of TiO 2 , which may produce oxidative stress and attack bacterial cell, ultimately leading to the modification of membrane permeability and cell damaging [6,7] . However, the relatively low antibacterial efficiency of pure TiO 2 in absence of UV or solar light irradiation greatly restricts its practical antimicrobial application.…”

Section: Introductionmentioning

confidence: 99%

Highly synergistic antimicrobial activity of spherical and flower-like hierarchical titanium dioxide/silver composites

Cheng

et al. 2017

Journal of Colloid and Interface Science

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ABSTRACT:A spherical titanium dioxide/silver (TiO 2 /Ag) composite and a flower-like hierarchical TiO 2 /Ag composite were prepared via a template-induced method and a solvothermal method based on the Ag/Carbon spheres templates followed by calcination treatment, respectively. The morphologies of the composites were controlled by changing the concentration of reactants and calcination temperature. The antibacterial efficiency of the composites was evaluated with both Gram-negative Escherichia coli and 2 species (ROS) and silver ions were observed, which lead to superior antibacterial activities of these TiO 2 /Ag composites with a bacteriostatic rate as high as 99% even in the absence of light. The morphological effect of the composites on the antibacterial efficacy was also investigated. In addition, a durable antimicrobial coating was also fabricated by incorporating the hierarchical TiO 2 /Ag composite into a commercial emulsion solution of polyvinyl acetate, which exhibited a promising application in bacterial sensitive locations.

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“…2). Reports have addressed cell wall repair during the culture of the cells on the agar plates increasing the time necessary for complete bacterial inactivation (Huang et al, 2000;Pigeot-Rémy et al, 2011).…”

Section: Drs Tem and Afm Of The Tion Samplesmentioning

confidence: 99%

Evidence for TiON sputtered surfaces showing accelerated antibacterial activity under simulated solar irradiation

2013

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New evidence is reported for TiON sputtered polyester surfaces activated by sunlight irradiation leading to the accelerated bacterial inactivation in the minute range. The absorption in Kubelka-Munk units of the TiON film was observed to be directly proportional to the time of Escherichia coli inactivation as detected by diffuse reflection spectroscopy (DRS). TiON layers were characterized by electron microscopy and by high angle angular dark field (HAADF) showing the continuous coverage of the polyester fibers by the TiON film. Ti 4+ /Ti 3+ redox catalysis was detected on the TiON surface by the XPS shifts during the bacteria inactivation process. Production of HO radicals on TiON-polyester as a function of sunlight irradiation was determined following the fluorescence of 2-hydroxyterephthalic acid. Release of Na and K-ions was determined by ICP-MS and provides the evidence that cell wall damage is a preceding step leading the bacterial inactivation. A stable performance of the TiON films was observed during repetitive bacterial inactivation.

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Photocatalysis and disinfection of water: Identification of potential bacterial targets

Cited by 147 publications

References 50 publications

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

Highly synergistic antimicrobial activity of spherical and flower-like hierarchical titanium dioxide/silver composites

Evidence for TiON sputtered surfaces showing accelerated antibacterial activity under simulated solar irradiation

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