Enhanced photocatalytic disinfection of indoor air

Vohra, Amit; Goswami, D. Yogi; Deshpande, Deepak A.; Block, S. S.

doi:10.1016/j.apcatb.2005.10.025

Cited by 158 publications

(75 citation statements)

References 29 publications

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“…Goswami et al [24] reported the total inactivation of Serratia marcescens in a photocatalytic reactor with recirculation. The photocatalytic inactivation of bioaerosols was also the subject of a handful of more recent publications [25][26][27][28][29][30][31][32][33][34][35][36][37][38]. The use of photocatalytic process to degrade spores immobilized on a TiO 2 -coated surface was first reported by Wolfrum et al [27].…”

Section: Special Symbols [ ] Concentrationmentioning

confidence: 99%

Effect of the radiation flux on the photocatalytic inactivation of spores of Bacillus subtilis

Zacarías

Vaccari

Alfano

et al. 2010

Journal of Photochemistry and Photobiology A: Chemistry

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a b s t r a c tIn this paper, the photocatalytic inactivation of dry spores of Bacillus subtilis dispersed on TiO 2 films and irradiated with UV-A radiation (2.44-0.29 mW cm −2 ) was studied. Experimental results indicate a minor reduction in the number of viable spores (69% of inactivation after 48 h of irradiation) when they were irradiated with UV-A radiation on borosilicate glass plates (without TiO 2 ), confirming the resistance of spores to UV-A radiation. However, the number of viable spores significantly decreased when they were irradiated with UV-A under similar conditions but on plates coated with TiO 2 (99.88% of inactivation after 24 h of irradiation), showing that dry spores of B. subtilis are vulnerable to photocatalytic inactivation. A simplified scheme was proposed to model the photocatalytic inactivation of B. subtilis, from which a kinetic expression was derived. Since the rate of photocatalytic inactivation is strongly dependent on the flux of the UV radiation on the TiO 2 films, the radiation field was modeled by means of CFD software. Experimental results of spore inactivation were fitted with the derived kinetic expression, showing the inactivation rate has a square root dependence on the radiation flux reaching the photocatalyst film.

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Section: Special Symbols [ ] Concentrationmentioning

confidence: 99%

Effect of the radiation flux on the photocatalytic inactivation of spores of Bacillus subtilis

Zacarías

Vaccari

Alfano

et al. 2010

Journal of Photochemistry and Photobiology A: Chemistry

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“…Electrons in the valence band that managed to move to the conduction band will leave a hole in the conduction band. Part of the hole formed will react with water vapor in the air to form hydroxyl radical (•OH), while the electrons will react with oxygen molecules to form radical anion superoxide (•O 2 -) [9]. If there is an organic species in a room where the instrument is placed radicals are highly reactive forms will cooperate in a completely oxidize the organic species [9].…”

Section: Fig 8: Effect Of Photo Catalystmentioning

confidence: 99%

“…Part of the hole formed will react with water vapor in the air to form hydroxyl radical (•OH), while the electrons will react with oxygen molecules to form radical anion superoxide (•O 2 -) [9]. If there is an organic species in a room where the instrument is placed radicals are highly reactive forms will cooperate in a completely oxidize the organic species [9]. The photo-catalytic radicals are able to degrade various air pollutants in the living room into carbon dioxide and water vapor [10].…”

Section: Fig 8: Effect Of Photo Catalystmentioning

confidence: 99%

Study of mosquito attractants for photo catalytic mosquito trap

Tristantini

Slamet

Stephanie

2013

IJET

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Photo catalytic mosquito trap is made of TiO 2 -Activated Carbon (AC) with a certain composition of AC. Research concerns on the heat spectrum which is produced by combination process of existing CO 2 and humid air. The purpose of performance testing is to observe capability of this device in trapping mosquitoes related to the air temperature profile for heat spectrum is play important role for attracting mosquitoes. Result shows photo catalytic mosquito trap is more effective than devices which only consist of UV light or stream of CO 2 and the humid air. A number of mosquitoes trapped by the photo catalyst coated panel configuration and UV lamps were lit proved far more effective because the heat production from recombination process. A little difference in temperature can be detected by mosquito.

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“…The doping of ZnO nanostructures has been reported to enhance the inactivation of microorganisms, either by providing a red shift in the band gap or by the dopant acting as a co-catalyst. A number of dopants including Pd (76), Ce (77), Cu (78), and Ag (79) (83). Ag-TiO 2 has also been effective for the disinfection of water (84).…”

Section: Figure 3 Visible Light Activation Enabled By Narrowing the mentioning

confidence: 99%

Nanotechnology Solutions for Global Water Challenges

McGuinness

Garvey

Whelan

et al. 2015

ACS Symposium Series

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The lack of clean and safe drinking water is responsible for more deaths than war, terrorism and weapons of mass destruction combined. This suggests contaminated water poses a significant threat to human health and welfare. In addition, standard water disinfection approaches such as sedimentation, filtration, and chemical or biological degradation are not fully capable of destroying emerging contaminants (e.g. pesticides, pharmaceutical waste products) or certain types of bacteria (e.g. Cryptosporidium parvum). Nanomaterials and nanotechnology based devices can potentially be employed to solve the challenges posed by various contaminants and

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Enhanced photocatalytic disinfection of indoor air

Cited by 158 publications

References 29 publications

Effect of the radiation flux on the photocatalytic inactivation of spores of Bacillus subtilis

Effect of the radiation flux on the photocatalytic inactivation of spores of Bacillus subtilis

Study of mosquito attractants for photo catalytic mosquito trap

Nanotechnology Solutions for Global Water Challenges

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