Photocatalytic inactivation of bacteria in a fixed-bed reactor: Mechanistic insights by epifluorescence microscopy

Pablos, Cristina; Grieken, Rafael van; Marugán, Javier; Moreno, Beatriz

doi:10.1016/j.cattod.2010.10.051

Cited by 37 publications

(26 citation statements)

References 35 publications

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“…Pablos et al [72] observed a higher inactivation rate at the beginning of the reaction with fixed TiO 2 . They suggested that damage was uniformly distributed over the whole cell wall in slurries, whereas it was more concentrated on small areas with fixed TiO 2 , requiring smaller amounts of radicals to achieve inactivation.…”

Section: Influence Of the Nature Of The Solution For Suspensionmentioning

confidence: 99%

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Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects

et al. 2014

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Abstract:In damp environments, indoor building materials are among the main proliferation substrates for microorganisms. Photocatalytic coatings, including nanoparticles of TiO 2 , could be a way to prevent microbial proliferation or, at least, to significantly reduce the amount of microorganisms that grow on indoor building materials. Previous works involving TiO 2 have already shown the inactivation of bacteria by the photocatalysis process. This paper studies the inactivation of Escherichia coli bacteria by photocatalysis involving TiO 2 nanoparticles alone or in transparent coatings (varnishes) and investigates different parameters that significantly influence the antibacterial activity. The antibacterial activity of TiO 2 was evaluated through two types of experiments under UV irradiation: (I) in slurry with physiological water (stirred suspension); and (II) in a drop deposited on a glass plate. The results confirmed the difference in antibacterial activity between simple drop-deposited inoculum and inoculum spread under a plastic film, which increased the probability of contact between TiO 2 and bacteria (forced contact). In addition, the major effect of the nature of the suspension on the photocatalytic disinfection ability was highlighted. Experiments were also carried out at the surface of transparent coatings formulated using nanoparticles of TiO 2 . The results showed significant antibacterial activities after 2 h and 4 h and suggested that improving the formulation would increase efficiency. OPEN ACCESSCoatings 2014, 4 671

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Section: Influence Of the Nature Of The Solution For Suspensionmentioning

confidence: 99%

“…Some authors have compared efficiencies between scattered and fixed TiO 2 [71][72][73]. Pablos et al [72] observed a higher inactivation rate at the beginning of the reaction with fixed TiO 2 .…”

Section: Influence Of the Nature Of The Solution For Suspensionmentioning

confidence: 99%

Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects

et al. 2014

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“…This limitation can be surpassed by synthesizing new form of efficient photocatalysts or immobilizing TiO 2 catalysts onto conductors that enables the application of electrochemical techniques. Moreover, a photoeletrocatalytic (PEC) system with an external potential bias can provide a superior solution by suppressing the charge recombination [17][18][19][20][21][22][23][24]. Furthermore, compared to the powder forms of TiO 2 , TiO 2 nanotubes can transfer electron more effectively due to their special cannular structure [22,[25][26][27], and subsequently the bactericidal efficiencies in a PEC system can be remarkably enhanced [17,22,23,27].…”

Section: Introductionmentioning

confidence: 99%

Comparative study on the photoelectrocatalytic inactivation of Escherichia coli K-12 and its mutant Escherichia coli BW25113 using TiO2 nanotubes as a photoanode

Nie

Gao

et al. 2014

Applied Catalysis B: Environmental

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“…TiO2 primary particle size was reported Initial adsorption mechanism is defined as the condition at which attachment of bacteria to the oxide surface upon an instantaneous introduction of TiO 2 and is one of the crucial steps prior to photocatalysis. Moreover, considering the larger size of bacteria in comparison to OM and anions, TiO 2 particles could possibly be adsorbed onto bacteria [28]. TiO 2 primary particle size was reported as 30 nm and dispersed particle size would be 200-215 nm in comparison to bacteria being greater than 0.45 µm [29].…”

Section: Bacterial Inactivationmentioning

confidence: 99%

“…Initial adsorption mechanism is defined as the condition at which attachment of bacteria to the oxide surface upon an instantaneous introduction of TiO2 and is one of the crucial steps prior to photocatalysis. Moreover, considering the larger size of bacteria in comparison to OM and anions, TiO2 particles could possibly be adsorbed onto bacteria [28]. TiO2 primary particle size was reported Initial adsorption mechanism is defined as the condition at which attachment of bacteria to the oxide surface upon an instantaneous introduction of TiO 2 and is one of the crucial steps prior to photocatalysis.…”

Section: Bacterial Inactivationmentioning

confidence: 99%

Photocatalytic Removal of Microbiological Consortium and Organic Matter in Greywater

Uyguner-Demirel

Bekbölet

2016

Catalysts

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This study aimed to investigate TiO 2 photocatalytic degradation of synthetically-prepared greywater samples with differing compositional contents of organic matter (OM), anion concentration, and microbiological consortium. Treatment efficiency was followed through removal of organic matter content in terms of dissolved organic carbon (DOC), specific spectroscopic parameters, and bacterial inactivation. Photocatalytic degradation kinetics were expressed by pseudo first-order kinetic modeling. The best DOC removal rates were attained for greywater samples containing OM with lower molecular size fractions. In addition, either enhancing or reducing the effect of common anions as radical scavengers were observed depending on the composition and concentration of variables in the greywater matrix. Moreover, possibility of a photocatalytic disinfection process was found to be of a bacteria type specific in OM-loaded synthetic greywater samples. Photocatalytic destruction of fecal streptococci required longer irradiation periods under all conditions. Bacterial removal rates were found to be in the order of total coliform > fecal coliform > fecal streptococci, for low organic load greywater, and fecal coliform > total coliform > fecal streptococci, for high organic load greywater.

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Photocatalytic inactivation of bacteria in a fixed-bed reactor: Mechanistic insights by epifluorescence microscopy

Cited by 37 publications

References 35 publications

Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects

Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects

Comparative study on the photoelectrocatalytic inactivation of Escherichia coli K-12 and its mutant Escherichia coli BW25113 using TiO2 nanotubes as a photoanode

Photocatalytic Removal of Microbiological Consortium and Organic Matter in Greywater

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