富氧空位/梯次结构CeO<sub>2</sub>的制备及光催化CO<sub>2</sub>还原

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Abstract Oxygen vacancy-enriched CeO₂ catalyst with hierarchical structure was synthesized by impregnation of Ce-BTC (BTC=benzene-1,3,5-tricarboxylic acid) into urea solution, followed by a calcination step. The as-prepared catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy (Raman) and ultraviolet visible diffuse reflection (DRS). The results showed that, different from the reported papers in which the g-C₃N₄ could be obtained by calcining urea impregnated metal organic frameworks (MOFs) at high temperature, while in this study, there was no g-C₃N₄ detected in Ce-BTC/urea system after calcination. The absence of g-C₃N₄ may be related to the MOF-derived CeO₂ that inhibited the thermal polycondensation of urea-decomposed species, and prevented the formation of g-C₃N₄. However, the addition of urea into the Ce-BTC induced the oxygen vacancy change within the formed CeO₂, and more importantly, Ce-BTC impregnated urea system developed into hierarchical structure after thermal treatment. When the as-prepared oxygen vacancy-enriched CeO₂-5 catalyst with hierarchical structure was used for photocatalytic CO₂ reduction, the yield of CO could reach 2.06μmol/g after 4hours, and the yield of CH₄ was 1.42μmol/g, which was more than 7 times higher than that of CeO₂ prepared by direct thermal decomposition of Ce-BTC.

Key words： oxygen vacancy porous structure MOFs CeO₂ g-C₃N₄

Received: 10 April 2022

PACS:

X703.5

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	Articles by authors
	XU Zhong-zhen
	JIA Ya-hui
	GAO Dao-wei
	ZHAO Wei
	CHEN Guo-zhu

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XU Zhong-zhen,JIA Ya-hui,GAO Dao-wei等. Preparation of oxygen vacancy-enriched CeO₂ catalyst with hierarchical structure and its photocatalytic CO₂ reduction performance[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5072-5079.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I11/5072

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