Facile fabrication of CeO₂ hollow microspheres with yeast as bio-templates

牟广宇¹，魏清莲¹，黄永民^1,2

1. Key Laboratory of Specially Functional Polymeric Materials and Related Technology Ministry of Education Department of Chemistry East China University of Science and Technology2. Shanghai Engineering Research Center of Space Engine Shanghai Institute of Space Propulsion

摘 要：CeO₂ hollow microspheres were prepared through a facile method by using yeast cells as bio-templates.The yeast provided a solid frame for the deposition of cerium hydroxide to form the hybrid Ce（OH）₃@yeast precursor.The resulting CeO₂ hollow microspheres were obtained by calcining the precursor.The products were characterized by field emission scanning electron microscopy（FE-SEM）,transmission electron microscopy（TEM）,X-ray powder diffraction（XRD）,fourier transform infrared spectroscopy（FTIR）,N₂ adsorption/desorption analysis,X-ray photoelectron spectrum（XPS） and H₂ temperature programmed reduction（H₂-TPR）.It was found that the products fully retained the morphology of the yeast cells and the size of the hollow microspheres was about1.5-2 μm.The catalytic test results showed that the as-obtained hollow CeO₂ microspheres possessed a higher catalytic activity in CO oxidation than the commercial CeO₂,which attributed to their higher surface area,hollow structure and superior reducibility.This study provided a promising route for the preparation of a variety of other inorganic hollow microspheres.

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