Photocatalytic degradation of bisphenol A as an endocrine disruptor in aqueous suspension using Ag-TiO2 catalysts

S. Rengaraj, X. Z. Li

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

A novel photocatalyst, titanium dioxide (TiO2) deposited with silver (Ag), was prepared by an ultrasonic-assisted sol-gel method and studied for the photocatalytic degradation of endocrine disrupting chemicals such as bisphenol A (BPA) under UV illumination, in order to determine its photocatalytic properties. A series of Ag-TiO2 catalysts prepared with different Ag dosage were characterised by SEM, EDX, XRD, XPS, and UV-Visible absorption spectroscopy and their photocatalytic activity was evaluated in the degradation of BPA in aqueous suspension. The experiment demonstrated that the presence of Ag in TiO2 catalysts could enhance the photocatalytic oxidation of BPA in aqueous suspension. It was found that the degradation of BPA by these catalysts followed the first-order kinetic model. The enhanced reduction of oxygen through better electron-hole separation in Ag-TiO2 particles compared to pure TiO2 particles increased the rates of BPA degradation. In the reaction of BPA degradation, the presence of two methyl groups in the BPA structure were initially attacked with OH and/or OOH radicals which have strong oxidising power, and then followed by the cleavage of the two phenyl moieties. Finally, the photomineralisation to CO2 gas occurred via oxidative processes involving carboxylic acids and aldehydes.

Original languageEnglish
Pages (from-to)20-37
Number of pages18
JournalInternational Journal of Environment and Pollution
Volume27
Issue number1-3
Publication statusPublished - 2006

Fingerprint

Endocrine Disruptors
endocrine disruptor
Suspensions
catalyst
Degradation
degradation
Catalysts
atomic absorption spectroscopy
carboxylic acid
Photocatalysts
aldehyde
Aldehydes
Absorption spectroscopy
Carboxylic acids
Titanium dioxide
Sol-gel process
cleavage
X-ray spectroscopy
Energy dispersive spectroscopy
silver

Keywords

  • Ag deposition
  • Bisphenol A
  • Photodegradation
  • Sol-gel
  • TiO
  • UV light

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Pollution

Cite this

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abstract = "A novel photocatalyst, titanium dioxide (TiO2) deposited with silver (Ag), was prepared by an ultrasonic-assisted sol-gel method and studied for the photocatalytic degradation of endocrine disrupting chemicals such as bisphenol A (BPA) under UV illumination, in order to determine its photocatalytic properties. A series of Ag-TiO2 catalysts prepared with different Ag dosage were characterised by SEM, EDX, XRD, XPS, and UV-Visible absorption spectroscopy and their photocatalytic activity was evaluated in the degradation of BPA in aqueous suspension. The experiment demonstrated that the presence of Ag in TiO2 catalysts could enhance the photocatalytic oxidation of BPA in aqueous suspension. It was found that the degradation of BPA by these catalysts followed the first-order kinetic model. The enhanced reduction of oxygen through better electron-hole separation in Ag-TiO2 particles compared to pure TiO2 particles increased the rates of BPA degradation. In the reaction of BPA degradation, the presence of two methyl groups in the BPA structure were initially attacked with OH and/or OOH radicals which have strong oxidising power, and then followed by the cleavage of the two phenyl moieties. Finally, the photomineralisation to CO2 gas occurred via oxidative processes involving carboxylic acids and aldehydes.",
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