Photocatalytic Mechanism of Rare Earth Metal Ce3+ Doped ZnO Materials

Abstract

Abstract: The photocatalytic materials of Ce∶ZnO composite powder with higher photocatalytic activity was prepared by sol-gel method. The crystal type and structure, free radical type and content, and photocatalytic efficiency of the prepared powder samples were characterized by X-ray diffraction, electron paramagnetic resonance and ultraviolet visible spectroscopy. X-ray diffraction test results of the composite samples show that with the increase of doping concentration, the characteristic peaks of (111) and (200) crystal plane of CeO₂ are detected successively, and the intensity of the diffraction peaks gradually increases. In addition, appropriate doping (c(Ce³⁺)=2%) can reduce the grain size of ZnO crystal. The results of electron paramagnetic resonance test show that there are three kinds of free radicals in Ce∶ZnO composite photocatalytic material, which are Zn-H complex, positive monovalent oxygen vacancy and superoxide ions adsorbed on the surface of CeO₂. Ultraviolet visible test shows that appropriate doping (c(Ce³⁺)=2%) could effectively improve the photocatalytic activity of ZnO catalyst. Based on the analysis of electron paramagnetic resonance and ultraviolet visible test results, the doping of Ce³⁺ provides more electrons for O₂ when it is converted to Ce⁴⁺, on the other hand, the generated CeO₂ has a strong oxygen absorption capacity. The photocatalytic activity of ZnO is improved by increasing the utilization rate of O₂ and generating more active free radicals. In the experiment, the influence process of Ce³⁺ doping on the synthesis of free radicals in ZnO materials was successfully characterized by electron paramagnetic resonance and X-ray diffraction techniques, and the electron transfer process in the photocatalytic degradation of methyl orange by Ce∶ZnO composites was reasonably explained by ultraviolet visible technology.

Key words: ZnO, electron paramagnetic resonance, Ce³⁺ doping, photocatalytic activity, electron transfer, free radical

CLC Number:

LI Peixin, XIN Lang, SONG Jia, YANG Aiyun, CUI Juan, YIN Chunhao. Photocatalytic Mechanism of Rare Earth Metal Ce³⁺ Doped ZnO Materials[J]. Journal of Synthetic Crystals, 2021, 50(9): 1723-1728.

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Photocatalytic Mechanism of Rare Earth Metal Ce³⁺ Doped ZnO Materials

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