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Improvement of catalytic activity and mechanistic analysis of transition metal ion doped nanoCeO2 by aqueous Rhodamine B degradation

Published online by Cambridge University Press:  04 September 2015

Lianli Zou ,
Xiangqian Shen ,
Qiuju Wang ,
Zhou Wang ,
Xinchun Yang  and
Maoxiang Jing
Lianli Zou
Affiliation:
Institute for Advanced Materials, Jiangsu University, Jiangsu Province, Zhenjiang 212013, China
Xiangqian Shen*
Affiliation:
Institute for Advanced Materials, Jiangsu University, Jiangsu Province, Zhenjiang 212013, China
Qiuju Wang
Affiliation:
Institute for Advanced Materials, Jiangsu University, Jiangsu Province, Zhenjiang 212013, China
Zhou Wang
Affiliation:
Institute for Advanced Materials, Jiangsu University, Jiangsu Province, Zhenjiang 212013, China
Xinchun Yang
Affiliation:
Institute for Advanced Materials, Jiangsu University, Jiangsu Province, Zhenjiang 212013, China
Maoxiang Jing
Affiliation:
Institute for Advanced Materials, Jiangsu University, Jiangsu Province, Zhenjiang 212013, China
*
a) Address all correspondence to this author. e-mail: shenxq@ujs.edu.cn
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Abstract

We compared the enhancement of photoactivity of transition metal ion (1 mol% Fe, Cu, Mn, and Zn) doped CeO2 nanocatalysts, and examined the effects of oxygen vacancies and the valence of the doped ions. The nanocatalysts were synthesized using a coprecipitation method and were characterized by x-ray diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer–Emmett–Teller isotherm methods and Raman spectroscopy. The photocatalytic activities of these catalysts were tested using aqueous Rhodamine B (RhB) degradation under UV irradiation. The spherical CeO2 nanocatalysts had a mesoporous structure and ∼15 nm average particle size. The catalytic activity was closely related to the oxygen vacancies and the valence of the doped ions. An increase in oxygen vacancies of doped CeO2 decreased the photocatalytic activity. The photocatalytic activities of the catalysts decreased in the order: 1 mol% Fe > Cu > Mn > Zn > undoped CeO2. The 1 mol% Fe doped CeO2 degraded ∼92.6% of the RhB after 3 h of irradiation, and the degradation obeyed pseudo-first-order kinetics. Liquid chromatography–mass spectrometry indicated that the photodegradation of RhB was a stepwise oxidation process. Under continuous oxidation, over a long reaction time, the RhB was completely oxidized to its final products, such as water and carbon dioxide.

Keywords

nanoCeO2transition metal ionsRhodamine Bphotodegradation

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Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 18 , 28 September 2015 , pp. 2763 - 2771
Copyright
Copyright © Materials Research Society 2015 

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