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Rare Metals
Erschienen in: Rare Metals 9/2021

24.04.2021 | Original Article

Enhanced photocatalytic activity and mechanism of CeO2 hollow spheres for tetracycline degradation

verfasst von: Dan Wang, Fang-Xin Yin, Bei Cheng, Yang Xia, Jia-Guo Yu, Wing-Kei Ho

Erschienen in: Rare Metals | Ausgabe 9/2021

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Abstract

Recently, researchers have focused on designing and fabricating highly efficient catalysts for photocatalytic organic pollutant removal. Herein, CeO2 hollow spheres were prepared through a simple template method followed by calcination at different temperatures for the tetracycline (TC) degradation under simulated solar light illumination. With a calcination temperature ranging from 400 to 800 °C, the as-prepared CeO2 hollow structure annealed at 600 °C (C600) exhibited the best degradation performance with a degradation rate constant of 0.066 min−1, which was about six and five times higher than those of the uncalcined sample (C0) and the sample calcined at 800 °C (C800), respectively. Moreover, sample C600 was also superior to the CeO2 solid particle photocatalyst. The characterisation results showed that the improved photocatalytic performance was mainly ascribed to the synergistic effect of large specific surface areas, high crystallisation and excellent light scattering ability. Furthermore, the results of active species trapping experiments demonstrated that the superoxide anion (•O2−) radical and hole (h+) played dominant roles in TC degradation. Subsequently, the possible TC degradation pathways and photocatalytic mechanism of CeO2 hollow spheres were proposed on the basis of high-performance liquid chromatography–mass spectrometry analysis, main active species and band edge positions of CeO2. The results of this study provide a basis for designing and exploring hollow structure catalysts for energy conversion and environmental remediation.

Graphical abstract

Vorheriger Artikel Noble metal-based high-entropy alloys as advanced electrocatalysts for energy conversion
Nächster Artikel Construction of S-scheme MnO2@CdS heterojunction with core–shell structure as H2-production photocatalyst

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Metadaten
Titel
Enhanced photocatalytic activity and mechanism of CeO2 hollow spheres for tetracycline degradation
verfasst von
Dan Wang
Fang-Xin Yin
Bei Cheng
Yang Xia
Jia-Guo Yu
Wing-Kei Ho
Publikationsdatum
24.04.2021
Verlag
Nonferrous Metals Society of China
Erschienen in
Rare Metals / Ausgabe 9/2021
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI
https://doi.org/10.1007/s12598-021-01731-2

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