Enhanced visible light photocatalytic disinfection of gram negative, pathogenic Escherichia coli bacteria with Ag/TiV oxide nanoparticles

Nair, Ranjith G.; Roy, Jetendra Kumar; Samdarshi, S.K.; Mukherjee, Ashis K.

doi:10.1016/j.colsurfb.2011.03.011

Cited by 21 publications

(8 citation statements)

References 34 publications

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“…TiO 2 nanoparticles can be designed in crystalline form, with the rutile and anatase phases being the most stable. To improve its antimicrobial properties, modifications of TiO 2 have been proposed, such as the addition of noble metal dopants [8].…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial activity of TiO2:Ag nanocrystalline heterostructures: Experimental and theoretical insights

et al. 2015

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We report the synthesis and characterization of silver-decorated titanium dioxide (TiO 2 :Ag) nanoparticles, as well as a discussion of their antimicrobial activity. This material was synthesized by microwave-assisted hydrothermal treatment and characterized by complementary techniques. The minimum inhibitory concentration and minimum bactericidal/fungicidal concentration of TiO 2 :Ag nanoparticles against planktonic and biofilm-forming strains of methicillin-resistant Staphylococcus aureus, Candida species (spp.) and the total biofilm mass were determined. The basis of the biological activity of TiO 2 :Ag was investigated by electronic analysis of the material using theoretical quantum chemical calculations. In the proposed mechanism of action, the impregnated semiconductor donates electrons to the forbidden band gaps in the metal, generating point defects, with partially located electrons and holes at the surface, initiating a radical process involving the solvent and biological target. Our results suggest that this TiO 2 :Ag nanomaterial has potential for use in the development of new therapeutic agents.

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Section: Introductionmentioning

confidence: 99%

Antimicrobial activity of TiO2:Ag nanocrystalline heterostructures: Experimental and theoretical insights

et al. 2015

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“…[5]. Speaking about wider coverage, technology affordability and uptake in the developing world, non-chemical treatment systems like gaseous ozone, visible/UV photocatalytic disinfection, ion-exchange resins, carbon-fiber filtration and freeelectrons exposure seem to be reasonable ideas [5][6][7][8][9][10][11][12][13]. This explains why the PATHOGENA free-electron-activated system (Figure 1) is the subject of this study.…”

Section: Introductionmentioning

confidence: 99%

Validation of the PATHOGENA Electron-Activated Reactor for Purifying Contaminated Water in the Parkersburg Area in West

Duah¹

2015

J Chem Eng Process Technol

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This paper concerns validation of the PATHOGENA version of electron-activated reactors designed to purify contaminated water to make it potable. The basic design of PATHOGENA is a 100-gallon plastic tank batch reactor which houses a vapor-ion plasma (VIP) generator and 1-micron ion-separator (ION-SEP) porous water filter. While the VIP generator splits ambient air into aggressive water treatment agents in the form of charged ions, free electrons, hydroxyl and peroxyl radicals using UV radiation, the ION-SEP filter is designed to eliminate broad-spectrum bacteria and other microbes. The validation process was started with creation of water quality database from: (a) contaminated surface water; (b) EPA/West Virginia Water Quality Standards, and (c) Vienna City Council drinking water. The PATHOGENA purifier was then run 14 days/month from April-September 2014 and samples analyzed for chemical and bacteriological quality. When the results were matched against previous data, PATHOGENA compared favorably with both EPA/West Virginia water quality standards and Vienna City drinking water (R 2 = 0.99; p<0.011; N = 13). The study found PATHOGENA as an affordable technology capable of delivering clean water to households at about $0.27 per person per day with economic savings of nearly $7.00 at the same rate.

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“…Visible light is not as photochemically reactive as UV radiation, but under appropriate conditions can be quite detrimental (McGinty and Fowler, 1982;Liou et al, 2011;Nair et al, 2011). Several authors have deduced that visible light has a negative effect on E. coli cells in freshwater (Fujijoka, 1981;Bracina et al, 1989).…”

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confidence: 99%

The survival of Escherichia coli upon exposure to irradiation with non-coherent polychromatic polarized light

Djurdjevic-Milosevic¹,

Solaja²,

Topalić-Trivunović³

et al. 2011

Vet. Med. - Czech

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ABSTRACT:The purpose of this work was to examine the influence of non-coherent polarized light upon the growth of Escherichia coli. Experiments were designed to test the main hypothesis that this kind of polychromatic light can produce decimal reductions in numbers of E. coli bacteria. Two strains of E. coli -isolated from ground pork and commercial culture E. coli ATCC 25922, were both exposed to light for 20, 30, 40 and 60 minutes. The source of non-coherent polarized light was a Bioptron-1 lamp (Zepter, Swiss) with the following technical characteristics: wavelength 400-2000 nm, polarization > 95%, and constant radiation dose 2.4 J/cm 2 per minute. The result for both strains showed a slight increase in bacterial count in response to an irradiation time of 20 min and decreases in bacterial counts for irradiation times of 30, 40 and 60 min without characteristics of a decimal reduction. Bacterial counts after treatments displayed a linear relationship with the total count of bacteria before treatments as well as the percentage surviving bacteria and irradiation time. Data analysis (ANOVA two factors with replication) showed that the survival of bacteria was influenced significantly by duration time (P < 0.01), bacterial culture (p<0.05), and interaction between duration time and bacterial culture (P < 0.01). Neither E. coli ATCC 25922 nor E. coli isolated from ground pork showed a decimal reduction after irradiation with non-coherent polychromatic polarized light.Keywords: bacteria; growth; light; plate count List of abbreviations ANOVA = analysis of variance; BGLB = brilliant green lactose bile broth; CFU = colony forming units; I = energy impute; IMViC = indole, methyl red, Voges-Proskauer, and citrate; N 0 = plate count before treatments; N = plate count after treatments; R 2 = coefficient of determination; S = survival; SD = standard deviation; VRBA = violet red bile agar; VTEC = verotoxin-producing Escherichia coli

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Enhanced visible light photocatalytic disinfection of gram negative, pathogenic Escherichia coli bacteria with Ag/TiV oxide nanoparticles

Cited by 21 publications

References 34 publications

Antimicrobial activity of TiO2:Ag nanocrystalline heterostructures: Experimental and theoretical insights

Antimicrobial activity of TiO2:Ag nanocrystalline heterostructures: Experimental and theoretical insights

Validation of the PATHOGENA Electron-Activated Reactor for Purifying Contaminated Water in the Parkersburg Area in West

The survival of Escherichia coli upon exposure to irradiation with non-coherent polychromatic polarized light

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