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Yeast-template synthesized Fe-doped cerium oxide hollow microspheres for visible photodegradation of acid orange 7

Author:
Zhao, Baoqin, Shao, Qian, Hao, Luhan, Zhang, Li, Liu, Zhen, Zhang, Bing, Ge, Shengsong, Guo, Zhanhu
Source:
Journal of colloid and interface science 2018 v.511 pp. 39-47
ISSN:
0021-9797
Subject:
X-ray diffraction, X-ray photoelectron spectroscopy, aqueous solutions, ceric oxide, coprecipitation, hydrogen peroxide, iron, irradiation, microparticles, nanoparticles, nitrates, oxygen, photocatalysis, photolysis, reflectance spectroscopy, scanning electron microscopy, surface area, yeasts
Abstract:
Fe-doped cerium oxide (CeO2) hollow microspheres were successfully synthesized by a simple co-precipitation route using yeast asa bio-template and nitrate as the oxide precursor. The products were characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, N2 adsorption–desorption isotherms and UV–Vis diffuse reflectance spectroscopy. It was found that the products had a well-defined ellipsoidal morphology and the size of the hollow microspheres was about 1.5–2.5μm. The formation mechanism of Fe-doped CeO2 hollow microspheres was proposed and discussed as well. The photocatalytic test results showed that the Fe-doped CeO2 hollow microspheres exhibited a higher photocatalytic activity in the degradation of acid orange 7 (AO7) aqueous solutions containing H2O2 under visible irradiation compared with CeO2 hollow microspheres and Fe-doped CeO2 nanoparticles, which was attributed to their more oxygen vacancies, higher specific surface area and lower band gap. The degradation rate of the Fe-doped CeO2 hollow microspheres was found to be 93% after 80min and the degradation reaction followed pseudo-first-order kinetics.
Agid:
6094448