Effects of shape and particle size on the photocatalytic kinetics and mechanism of nano-CeO<sub>2</sub>

Zixiang Cui; Lu Zhang; Yongqiang Xue; Ya’nan Feng; Mengying Wang; Jiaojiao Chen; Boteng Ji; Chenyu Wang; Yidi Xue

doi:10.1007/s12613-021-2332-0

Volume 29 Issue 12

Dec. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(12): 2221-2231

Zixiang Cui, Lu Zhang, Yongqiang Xue, Ya’nan Feng, Mengying Wang, Jiaojiao Chen, Boteng Ji, Chenyu Wang, and Yidi Xue, Effects of shape and particle size on the photocatalytic kinetics and mechanism of nano-CeO₂, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2221-2231. https://doi.org/10.1007/s12613-021-2332-0

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Zixiang Cui, Lu Zhang, Yongqiang Xue, Ya’nan Feng, Mengying Wang, Jiaojiao Chen, Boteng Ji, Chenyu Wang, and Yidi Xue, Effects of shape and particle size on the photocatalytic kinetics and mechanism of nano-CeO2, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2221-2231. https://doi.org/10.1007/s12613-021-2332-0

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Research Article

Effects of shape and particle size on the photocatalytic kinetics and mechanism of nano-CeO₂

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Corresponding author:
Zixiang Cui E-mail: czxlw2018@163.com
Received: 27 May 2021; Revised: 18 July 2021; Accepted: 19 July 2021; Available online: 20 July 2021

Abstract

Abstract

Nanomaterials have been widely applied to many fields because of their excellent photocatalytic performance. The performance is closely related to the catalytic kinetics, but it is not completely clear about the influencing regularities of shape and particle size on the photocatalytic kinetics of nanomaterials and the photocatalytic kinetic mechanism. In this paper, nano-CeO₂ with different shapes and particle sizes were prepared, the kinetic parameters of adsorption and photocatalytic degradation were determined, and the effects of shape and particle size on the kinetics of adsorption and photocatalysis and photocatalytic mechanism were discussed. The results show that the shape and particle size have significant influences. With the decreases of diameter, the performances of adsorption and photocatalysis of nano-CeO₂ are improved; and these performances of spherical nano-CeO₂ are greater than those of linear nano-CeO₂. The shape and particle size have no effects on the kinetic order and mechanism of the whole photocatalytic process. Then a generalized mechanism of photocatalytic kinetics of nanomaterials was proposed and the mechanism rate equation was derived. Finally, the conclusion can be drawn: the desorption of photodegradation products is the control step of photocatalytic kinetics, and the kinetic order of photocatalytic degradation reaction is 1. The mechanism is universal and all nanomaterials have the same photocatalytic kinetic mechanism and order.
- nanoparticles;
- photocatalysis;
- particle size;
- shape;
- kinetics

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