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Effects of Ag and Pt on photocatalytic degradation of endocrine disrupting chemicals in water [An article from: Chemical Engineering Journal]
Book Details
Author(s)H.M. Coleman, K. Chiang, R. Amal
PublisherElsevier
ISBN / ASINB000RR832I
ISBN-13978B000RR8329
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Chemical Engineering Journal, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The effects of silver and platinum metals on the photocatalytic degradation of endocrine disrupting chemicals (EDCs) in water over TiO"2 (Degussa P25) were investigated. The natural oestrogens 17@b-oestradiol and oestriol were studied as well as the synthetic oestrogen 17@a-ethynyloestradiol and the xenoestrogens bisphenol A, resorcinol and 2,4-dichlorophenol. Ag/TiO"2 and Pt/TiO"2 catalysts were prepared by photodeposition. Photocatalytic reactions were carried out in an immobilised TiO"2 system and a TiO"2 slurry system. It was found that the addition of silver or platinum had no effect on the photocatalytic degradation or mineralisation of all the endocrine disrupting chemicals at concentrations found in water. This was attributed to the high concentration of holes and hydroxyl radicals in the system compared to the low amount of organic matters to be degraded. It is therefore not viable to add expensive metals to photocatalytic systems for the removal of low concentrations of organic pollutants in water. At high concentration of EDC, a significant increase in the reaction rate was observed for bisphenol A and resorcinol over Pt/TiO"2. However, there was a decrease in reaction rate for bisphenol A over Ag/TiO"2 and no significant effect with resorcinol, indicating that the reactions are metal specific, substrate specific and may depend on the substrates molecular structure. The catalytic properties as well as the photocatalytic properties of the catalyst should also be considered. It was concluded that there is no universal explanation to explain the effects of metals on photocatalysis of organics in water and that there are many factors which should be considered.
Description:
The effects of silver and platinum metals on the photocatalytic degradation of endocrine disrupting chemicals (EDCs) in water over TiO"2 (Degussa P25) were investigated. The natural oestrogens 17@b-oestradiol and oestriol were studied as well as the synthetic oestrogen 17@a-ethynyloestradiol and the xenoestrogens bisphenol A, resorcinol and 2,4-dichlorophenol. Ag/TiO"2 and Pt/TiO"2 catalysts were prepared by photodeposition. Photocatalytic reactions were carried out in an immobilised TiO"2 system and a TiO"2 slurry system. It was found that the addition of silver or platinum had no effect on the photocatalytic degradation or mineralisation of all the endocrine disrupting chemicals at concentrations found in water. This was attributed to the high concentration of holes and hydroxyl radicals in the system compared to the low amount of organic matters to be degraded. It is therefore not viable to add expensive metals to photocatalytic systems for the removal of low concentrations of organic pollutants in water. At high concentration of EDC, a significant increase in the reaction rate was observed for bisphenol A and resorcinol over Pt/TiO"2. However, there was a decrease in reaction rate for bisphenol A over Ag/TiO"2 and no significant effect with resorcinol, indicating that the reactions are metal specific, substrate specific and may depend on the substrates molecular structure. The catalytic properties as well as the photocatalytic properties of the catalyst should also be considered. It was concluded that there is no universal explanation to explain the effects of metals on photocatalysis of organics in water and that there are many factors which should be considered.
