Photocatalytic degradation of gaseous sulfur compounds by silver-deposited titanium dioxide

Katō, Susumu; Hirano, Yuji; Iwata, Misao; Sano, Taizo; Takeuchi, Koji; Matsuzawa, Sadao

doi:10.1016/j.apcatb.2004.10.015

Cited by 126 publications

(58 citation statements)

References 21 publications

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“…For example Kato [28] et al showed that photo-deposition of Ag on a TiO 2 film enhanced photocatalytic degradation of gaseous sulphur compounds and suggested that Ag acted as a co-catalyst. Sokmen [29] et al showed that addition of AgNO 3 to anatase (form of TiO 2 ) enhanced the photocatalytic activity and enhanced the killing of Escherichia coli in suspension.…”

Section: Introductionmentioning

confidence: 99%

Highly bioactive silver and silver/titania composite films grown by chemical vapour deposition

Brook

Evans

Foster

et al. 2007

Journal of Photochemistry and Photobiology A: Chemistry

127

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This paper describes how photocatalytically active films of TiO 2, grown by thermal CVD, may be functionally and structurally modified by deposition of nanostructured silver via a novel flame assisted CVD process. The resulting composite films are shown to be highly durable, highly photocatalytically active and are also shown to possess strong antibacterial behaviour.The deposition control, arising from the described approach, offers the potential to control the film nanostructure, which is proposed to be crucial in determining the photo and bio-activity of the combined film structure, and the transparency of the composite films.Furthermore, we show that the resultant films also exhibit "self regeneration" capability, in that they both kill bacteria present on the film surface and then photodegrade the residues. Such a dual action significantly reducing the problems of surface deactivation due to build up of contamination.These properties are especially significant when combined with the well-known durability of CVD deposited thin films, offering new opportunities for enhanced application in areas where bio-active surface functionality is sought.

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Section: Introductionmentioning

confidence: 99%

Highly bioactive silver and silver/titania composite films grown by chemical vapour deposition

Brook

Evans

Foster

et al. 2007

Journal of Photochemistry and Photobiology A: Chemistry

127

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“…[11][12][13][14][15]. TiO 2 doped with Ag and mounted on the ceramics can also work as a gas filter for removing some odours like H 2 S, CH 3 SH or toxic N 2 O gas [16,17]. Ag deposited on the surface of TiO 2 can prevent the recombination reaction between photogenerated holes and electrons, enhancing the yield of photocatalytic activity of the semiconductor [18].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic and Self-Cleaning Properties of Ag-Doped TiO2

Tryba¹,

Piszcz²,

Morawski³

2009

TOMSJ

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Commercially available TiO 2 of anatase structure produced in the Chemical Factory Police S.A. was modified by doping Ag from AgNO 3 solution via photodeposition method. The obtained amount of deposited Ag on TiO 2 was in the range of 0.11 to 0.98 mass %. Deposition of Ag on TiO 2 resulted in the retarding of the recombination reaction and formation of the higher amount of OH radicals on the photocatalyst surface during irradiation with UV light. The photocatalytic activity of samples was tested for the decomposition of phenol and Reactive Black in the water solution under both, UV and artificial solar light radiation. Deposition of Ag on TiO 2 surface increased its photocatalytic activity towards the Reactive Black decomposition but not for phenol. High adsorption of Reactive Black on Ag modified TiO 2 photocatalysts, which was higher than on TiO 2 , could enhance the photocatalytic activity of these samples. The solution with 1% slurry of TiO 2 -Ag was sprayed on the surface of concrete. For concrete impregnated with TiO 2 -Ag slurry the both, fungicidal and self-cleaning effect for dyes were observed.

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“…Ozone oxidation of H 2 S is very effective treatment but it is very costly to set up a treatment facility (Kato et al, 2005). Chemical methods use oxidizing agents to oxidize H 2 S (Willey et al, 1964;Dohnalek and Fitzpatrick, 1983).…”

Section: Removal Of H 2 S From Watermentioning

confidence: 99%

Removal of Hydrogen Sulphide from Water

Edwards¹

2011

American Journal of Environmental Sciences

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Problem statement: The concentration of H 2 S in groundwater is a significant problem in various areas across Canada. Hydrogen sulphide dissolves in ground water imparting undesirable taste and irritating rotten egg smell which makes it unpalatable. Ingestion of sulphides through drinking water can result in stomach discomfort, nausea and vomiting. Humans exposed to high concentrations of H 2 S for prolonged periods show symptoms of gastro-intestinal upset, anorexia, nausea, somnolence, amnesia, loss of consciousness, delirium, hallucinations, difficulty in swallowing, low blood pressure, slowing of heart rate, double vision and epileptiform convulsions. Hydrogen sulphide in blood is rapidly oxidized by molecular oxygen and thus reduces the oxidation power of haemoglobin. Unoxidized hydrogen sulphide can act upon the central nervous system and cause either paralysis or respiratory failure. It is therefore, necessary to have a very low concentration of H 2 S in the water. Approach: An automatic system for the addition of KMnO 4 and removal of hydrogen sulphide from ground water was developed and tested. The system consisted of a freshwater tank, a pump, a chemical storage tank, a solenoid valve, a photocell and electronic circuit, a drainage tank, a filter and a set of valves. It was possible to use a photocell to detect the presence of excess KMnO 4 in the system and to control the addition of KMnO 4 into the system. Results: The system accomplished complete removal of hydrogen sulphide in the range of 1-30 ppm. The present system utilizes on/off control for the addition of the chemical. The amount of KMnO 4 needed as a percentage of the amount used was in the range of 5-28%. Conclusion: The photocell and circuit could be used to add an amount of chemical that is constantly proportional to the amount of hydrogen sulphide in the water. The control of a positive displacement chemical feed pump would be an ideal application for this system. The speed of the pump could be controlled in such a manner that would allow a very small excess amount of potassium permanganate to be maintained in the system.

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Photocatalytic degradation of gaseous sulfur compounds by silver-deposited titanium dioxide

Cited by 126 publications

References 21 publications

Highly bioactive silver and silver/titania composite films grown by chemical vapour deposition

Highly bioactive silver and silver/titania composite films grown by chemical vapour deposition

Photocatalytic and Self-Cleaning Properties of Ag-Doped TiO2

Removal of Hydrogen Sulphide from Water

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