Please use this identifier to cite or link to this item:
Title: Enhanced photocatalytic activity of Ce³⁺-TiO₂hydrosols in aqueous and gaseous phases
Authors: Liu, Tong-xu
Li, Xiang-zhong
Li, Fang-bai
Subjects: Ce³⁺-TiO₂
Environmental application
Photocatalytic activity
Issue Date: 1-Mar-2010
Publisher: Elsevier
Source: Chemical engineering journal, 1 Mar. 2010, v. 157, no. 2-3, p. 475-482.
Abstract: A series of cerium ion-doped titanium dioxide (Ce³⁺-TiO₂) hydrosols were prepared by a coprecipitation–peptization method and characterized by UV–vis transmittance spectroscopy (T%), particle size distribution (PSD), X-ray diffraction (XRD), and Brunauer–Emmett–Teller (BET) and Barret–Joyner–Halender methods (BJH), respectively. The results demonstrated that as the doped Ce³⁺ content increased, the crystalline size, BET surface area and transmittance decreased significantly, but the particle size increased gradually. The photocatalytic activity of Ce³⁺-TiO₂hydrosols was evaluated in aqueous solution for methylene blue (MB) and 2,3-dichloriphenol (2,3-DCP) degradations, and also in gaseous phase for benzene degradation. The results showed that the overall photocatalytic activity of Ce³⁺-TiO₂ hydrosols in aqueous and gaseous phases under UVA and visible illumination was significantly higher than pure TiO₂hydrosol due to its better separation of electron-hole pairs and visible light response. Additionally, the formation of the surface complex of TiO₂and 2,3-DCP with visible light response is also contributed to the 2,3-DCP degradation, and the relevant possible reaction mechanisms were discussed with details. The kinetic data demonstrated that the Ce³⁺-TiO₂hydrosols with the content of Ce³⁺ doping between 0.5 and 1% achieved the best performance in both the aqueous and gaseous phases. This study provided the comprehensive understanding of the Ce³⁺-TiO₂hydrosol characteristics and reaction mechanisms, and the results indicate that these Ce³⁺-TiO₂hydrosols may have good potential for pollutant degradation either in aqueous phase or gaseous phase.
Rights: Chemical Engineering Journal © 2009 Elsevier. The journal web site is located at
Type: Journal/Magazine Article
DOI: 10.1016/j.cej.2009.12.010
ISSN: 1385-8947
Appears in Collections:CEE Journal/Magazine Articles

Files in This Item:
File Description SizeFormat 
103.pdfPre-published version307.19 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.