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Title: Photocatalytic degradation of bisphenol A as an endocrine disruptor in aqueous suspension using Ag-TiO₂catalysts
Authors: Rengaraj, S.
Li, Xiang-zhong
Subjects: Bisphenol A
Ag deposition
UV light
Issue Date: 2006
Publisher: Inderscience
Source: International journal of environment and pollution, 2006, v. 27, no. 1/2/3, p. 20-37.
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-TiO₂catalysts 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 TiO₂catalysts 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-TiO₂particles compared to pure TiO₂particles 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 CO₂gas occurred via oxidative processes involving carboxylic acids and aldehydes.
Rights: Copyright © 2006 Inderscience Enterprises Ltd. The journal web page at:
Type: Journal/Magazine Article
ISSN: 0957-4352 (print)
1741-5101 (online)
Appears in Collections:CEE Journal/Magazine Articles

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