Porous cerium dioxide hollow spheres and their photocatalytic performance

Saisai Yuan; Qitao Zhang; Bin Xu; Zhengyuan Jin; Ya Zhang; Yin Yang; Ming Zhang; Teruhisa Ohno

doi:10.1039/C4RA12127A

Porous cerium dioxide hollow spheres and their photocatalytic performance†

Saisai Yuan,^ab Qitao Zhang,^ab Bin Xu,^abc Zhengyuan Jin,^a Ya Zhang,^e Yin Yang,^a Ming Zhang*^bc and Teruhisa Ohno*^ad

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* Corresponding authors

^a Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
E-mail: tohno@che.kyutech.ac.jp
Fax: +81 93 884 3318
Tel: +81 93 884 3318

^b School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
E-mail: lxyzhangm@yzu.edu.cn
Fax: +86 51487979244
Tel: +86 51487990926

^c Test Center, Yangzhou University, Yangzhou 225002, China

^d JST, PRESTO and ACT-C, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan

^e School of Environmental Science and Engineering, Yangzhou University, Yangzhou 225002, China

Abstract

Uniform-sized and monodiperse cerium dioxide porous hollow spheres (CeO₂-PH) based on the Ostwald ripening process were fabricated by a simple solvothermal method in the absence of any templates. The structure and morphology of CeO₂-PH and CeO₂-NP (cerium dioxide nanoparticles) were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), and Brunauer–Emmett–Teller (BET) surface area analysis. The average diameter of face-centered cubic (fcc) phase CeO₂-PH was ca. 160 nm with a high specific surface area, and it is composed of small crystal grain particles (ca. 10 nm). Furthermore, CeO₂-PH has high activity for the evaluation of acetaldehyde decomposition. Optical, defect, and chemical state properties were characterized by Raman spectra, ultraviolet-visible absorption spectroscopy (UV-vis), and X-ray photoelectron spectroscopy (XPS). The presence of Ce³⁺ ions narrowed the band gap of CeO₂-PH, resulting in the high light harvesting. The large amount of oxygen vacancy defects provided many activity sites on CeO₂-PH in the photocatalytic process. The formation scheme and photocatalyic mechanism will be discussed in this paper.

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DOI: https://doi.org/10.1039/C4RA12127A
Article type: Paper
Submitted: 10 Oct 2014
Accepted: 12 Nov 2014
First published: 12 Nov 2014

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RSC Adv., 2014,4, 62255-62261

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Porous cerium dioxide hollow spheres and their photocatalytic performance

S. Yuan, Q. Zhang, B. Xu, Z. Jin, Y. Zhang, Y. Yang, M. Zhang and T. Ohno, RSC Adv., 2014, 4, 62255 DOI: 10.1039/C4RA12127A

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Porous cerium dioxide hollow spheres and their photocatalytic performance†

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