A novel TiO2-assisted solar photocatalytic batch-process disinfection reactor for the treatment of biological and chemical contaminants in domestic drinking water in developing countries

Duffy, Eleanor F.; Touati, F. Al; Kehoe, S.C.; McLoughlin, O. A.; Gill, Laurence; Gernjak, Wolfgang; Oller, Isabel; Maldonado, Manuel I.; Malato, Sixto; Cassidy, John; Reed, Robert H.; McGuigan, Kevin G.

doi:10.1016/j.solener.2004.05.006

Cited by 85 publications

(47 citation statements)

References 18 publications

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“…The linear decrease in concentration with respect to time indicates zero order degradation in agreement with the other results obtained in this study. This is also in good agreement with literature reports involving surface confined TiO 2 [45]. Results presented in Fig.…”

Section: Degradation Of Cat Using a Pec Cellsupporting

confidence: 93%

A practical photoelectrochemical cell using non precious metal electrodes

2010

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In this study a Photoelectrochemical Cell (PEC) constructed with inexpensive materials photodegraded selected organic compounds present in model waste waters, with the concomitant production of electrical current. Organic substrates dissolved in salt water included formic acid, 2-propanol, 1,2-dihydroxybenzene and ascorbic acid. Significant degradation of ascorbic acid was achieved when the cell was illuminated with a household 60 W tungsten light bulb, although better results were achieved with UV sources. Degradation of all the compounds was found to occur by zero order kinetics, and the PEC was shown not to work appreciably in dark conditions. Using a conventional light bulb, a formic acid PEC produced a power density of 19.1 ± 2 mW m -2 . When exposed to natural daylight, a power density of 31.5 ± 2 mW m -2 was achieved. There is considerable scope for scale up of this device for exterior use.

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Section: Degradation Of Cat Using a Pec Cellsupporting

confidence: 93%

A practical photoelectrochemical cell using non precious metal electrodes

2010

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“…[4][5][6][7][8][9]. Anatase/rutile TiO 2 remains the most widely used and studied photocatalyst material and recent fundamental studies have demonstrated that surface defects such as oxygen vacancies mediate the dissociation of water on its surface [10].…”

Section: Homentioning

confidence: 99%

ZnO films grown by pulsed-laser deposition on soda lime glass substrates for the ultraviolet inactivation of Staphylococcus epidermidis biofilms

Mosnier

O’Haire

McGlynn

et al. 2009

Science and Technology of Advanced Materials

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We found that a ZnO film of 2 µm thickness which was laser-deposited at room temperature onto a plain soda lime glass substrate, exhibits notable antibacterial activity against a biofilm of Staphylococcus epidermidis when back-illuminated by a UVA light source with a peak emission wavelength of about 365 nm. X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), UV-visible absorption spectroscopy, Raman spectroscopy and x-ray photoemission spectroscopy (XPS) were used to characterize the ZnO films before and after the interactions with the biofilm and the ultraviolet light, respectively. The as-deposited film was highly textured with the wurtzite (0002) in-plane orientation (c-axis perpendicular to ZnO surface) and had a surface rms roughness of 49.7 nm. In the as-deposited film, the Zn to O ratio was 1 to 0.95. After the UV and biofilm treatments, the ZnO film surface had become rougher (rms roughness 68.1 nm) and presented uniform micron-sized pitting randomly distributed, while the zinc to oxygen ratio had become 1 to 2.2. In this case, both the UV-visible and Raman spectra pointed to degradation of the structural quality of the material. On the strength of these data, we propose a model for the mediation of the bactericidal activity in which the photogeneration of highly oxidizing species and the presence of active surface defect sites both play an important role. This study is of particular interest for the acute problem of disinfection of pathogenic biofilms which form on medical device/implant surfaces.

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“…Suspensions containing TiO2 are effective at killing Escherichia coli. This has led to the development of photo catalytic methods for the killing of bacteria and viruses using TiO2 in aqueous media [48,49]. The efficacy of natural products as antimicrobials accompanied by slight or lack of side effect is most likely depends on the compound's structure that interacts with the toxin or pathogen and not with molecules of the host meaning that their effect is specific.…”

Section: Detection the Antibiofilm Activity Of Tio2 Npsmentioning

confidence: 99%