Effects of Ag and Pt on photocatalytic degradation of endocrine disrupting chemicals in water

Heather Coleman, K. Chiang, R. Amal

Research output: Contribution to journalArticle

126 Citations (Scopus)

Abstract

The effects of silver and platinum metals on the photocatalytic degradation of endocrine disrupting chemicals (EDCs) in water over TiO2 (Degussa P25) were investigated. The natural oestrogens 17β-oestradiol and oestriol were studied as well as the synthetic oestrogen 17α-ethynyloestradiol and the xenoestrogens bisphenol A, resorcinol and 2,4-dichlorophenol. Ag/TiO2 and Pt/TiO2 catalysts were prepared by photodeposition. Photocatalytic reactions were carried out in an immobilised TiO2 system and a TiO2 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/TiO2. However, there was a decrease in reaction rate for bisphenol A over Ag/TiO2 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.
LanguageEnglish
Pages65-72
JournalChemical Engineering Journal
Volume113
Issue number1
Early online date3 Oct 2005
DOIs
Publication statusE-pub ahead of print - 3 Oct 2005

Fingerprint

Endocrine Disruptors
Degradation
degradation
Water
Metals
metal
platinum
Silver
reaction rate
Reaction rates
silver
catalyst
Platinum metals
Estradiol Congeners
substrate
water
Estriol
Catalysts
Photocatalysis
Organic pollutants

Keywords

  • Titanium dioxide photocatalysis
  • Endocrine disrupting chemicals
  • 17β-Oestradiol
  • Oestriol
  • 17α-Ethynyloestradiol
  • Bisphenol A
  • 2
  • 4-Dichlorophenol
  • Resorcinol
  • Ag/TiO2
  • Pt/TiO2

Cite this

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abstract = "The effects of silver and platinum metals on the photocatalytic degradation of endocrine disrupting chemicals (EDCs) in water over TiO2 (Degussa P25) were investigated. The natural oestrogens 17β-oestradiol and oestriol were studied as well as the synthetic oestrogen 17α-ethynyloestradiol and the xenoestrogens bisphenol A, resorcinol and 2,4-dichlorophenol. Ag/TiO2 and Pt/TiO2 catalysts were prepared by photodeposition. Photocatalytic reactions were carried out in an immobilised TiO2 system and a TiO2 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/TiO2. However, there was a decrease in reaction rate for bisphenol A over Ag/TiO2 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.",
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Effects of Ag and Pt on photocatalytic degradation of endocrine disrupting chemicals in water. / Coleman, Heather; Chiang, K.; Amal, R.

In: Chemical Engineering Journal, Vol. 113, No. 1, 03.10.2005, p. 65-72.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of Ag and Pt on photocatalytic degradation of endocrine disrupting chemicals in water

AU - Coleman, Heather

AU - Chiang, K.

AU - Amal, R.

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N2 - The effects of silver and platinum metals on the photocatalytic degradation of endocrine disrupting chemicals (EDCs) in water over TiO2 (Degussa P25) were investigated. The natural oestrogens 17β-oestradiol and oestriol were studied as well as the synthetic oestrogen 17α-ethynyloestradiol and the xenoestrogens bisphenol A, resorcinol and 2,4-dichlorophenol. Ag/TiO2 and Pt/TiO2 catalysts were prepared by photodeposition. Photocatalytic reactions were carried out in an immobilised TiO2 system and a TiO2 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/TiO2. However, there was a decrease in reaction rate for bisphenol A over Ag/TiO2 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.

AB - The effects of silver and platinum metals on the photocatalytic degradation of endocrine disrupting chemicals (EDCs) in water over TiO2 (Degussa P25) were investigated. The natural oestrogens 17β-oestradiol and oestriol were studied as well as the synthetic oestrogen 17α-ethynyloestradiol and the xenoestrogens bisphenol A, resorcinol and 2,4-dichlorophenol. Ag/TiO2 and Pt/TiO2 catalysts were prepared by photodeposition. Photocatalytic reactions were carried out in an immobilised TiO2 system and a TiO2 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/TiO2. However, there was a decrease in reaction rate for bisphenol A over Ag/TiO2 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.

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KW - Endocrine disrupting chemicals

KW - 17β-Oestradiol

KW - Oestriol

KW - 17α-Ethynyloestradiol

KW - Bisphenol A

KW - 2

KW - 4-Dichlorophenol

KW - Resorcinol

KW - Ag/TiO2

KW - Pt/TiO2

U2 - 10.1016/j.cej.2005.07.014

DO - 10.1016/j.cej.2005.07.014

M3 - Article

VL - 113

SP - 65

EP - 72

JO - Chemical Engineering Journal

T2 - Chemical Engineering Journal

JF - Chemical Engineering Journal

SN - 1385-8947

IS - 1

ER -