Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/2406
Title: Effect of alumina on photocatalytic activity of iron oxides for bisphenol A degradation
Authors: Li, Fang-bai
Li, Xiang-zhong
Liu, Cheng-shuai
Liu, Tong-xu
Subjects: Alumina
Bisphenol A
Hematite
Iron oxides
Maghemite
Photodegradation
Issue Date: 1-Oct-2007
Publisher: Elsevier
Source: Journal of hazardous materials, 1 Oct. 2007, v. 149, no. 1, p. 199-207.
Abstract: To study the photodegradation of organic pollutants at the interface of minerals and water in natural environment, three series of alumina-coupled iron oxides (Al₂O₃–Fe₂O₃-300, Al₂O₃–Fe₂O₃-420, and Al₂O₃–Fe₂O₃3-550) with different alumina fraction were prepared and characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) and Barret–Joyner–Halender (BJH), and Fourier transform infrared spectra (FTIR). The XRD results showed that existence of alumina in iron oxides could hinder the formation of maghemite and hematite, and also the crystal transformation from maghemite to hematite during sintering. It has been confirmed that the BET surface area and micropore surface area of Al₂O₃–Fe₂O₃catalysts increased with an increased dosage of alumina and with decreased sintering temperature. The pore size distribution also depended on the fraction of alumina. Furthermore, all Al₂O₃–Fe₂O₃catalysts had a mixed pore structure of micropore, mesopore and macropore. FTIR results showed that FTIR peaks attributable to Fe–O vibrations of maghemite or hematite were also affected by alumina content and sintering temperature. It was confirmed that the crystal structure and crystalline, the surface area and pore size distribution of Al₂O₃–Fe₂O₃catalysts depend strongly on the content of alumina and also sintering temperature. Bisphenol A (BPA) was selected as a model endocrine disruptor in aquatic environment. The effects of alumina on the photocatalytic activity of iron oxides for BPA degradation were investigated in aqueous suspension. The experimental results showed that the dependence of BPA degradation on the alumina content was attributable to the crystal structure, crystalline and also the properties of their surface structures. It was confirmed that the mixed crystal structure of maghemite and hematite could achieve the higher photocatalytic activity than maghemite or hematite alone.
Rights: Journal of Hazardous Materials © 2007 Elsevier. The journal web site is located at http://www.sciencedirect.com.
Type: Journal/Magazine Article
URI: http://hdl.handle.net/10397/2406
DOI: 10.1016/j.jhazmat.2007.03.069
ISSN: 0304-3894
Appears in Collections:CEE Journal/Magazine Articles

Files in This Item:
File Description SizeFormat 
77.pdfPre-published version564.27 kBAdobe PDFView/Open


All items in the PolyU Institutional Repository are protected by copyright, with all rights reserved, unless otherwise indicated. No item in the PolyU IR may be reproduced for commercial or resale purposes.