Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/2415
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
Hydrosols
Preparation
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 http://www.sciencedirect.com.
Type: Journal/Magazine Article
URI: http://hdl.handle.net/10397/2415
DOI: 10.1016/j.cej.2009.12.010
ISSN: 1385-8947
Appears in Collections:CEE Journal/Magazine Articles

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