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Biomimetic nano CeO_2 materials were prepared by using bean sprouts as bio-template through impregnation and thermal decomposition. For characterization of structure, X-ray diffraction spectroscopy(XRD), field emission scanning electron microscopy(FESEM), transmission electron microscopy(TEM), UV-Vis diffuse reflectance spectra(UV-Vis/DRS) nitrogen adsorption-desorption measurements and Labsolar H_2 system were adopted. The results demonstrated that the samples prepared at 550 ℃ not only completely removed the original bio-template, but also retained the morphology and microstructure of bean sprouts. Then the biomorphic structure of fluorite structure CeO_2 material was obtained. Micro-pores with a diameter of about 2–3 nm were distributed among the particles, which provided more favorable channel for the photocatalytic reaction. Biomimetic CeO_2 materials exhibited clear red shift(50 nm) compared with powder CeO_2, which could be excited by visible irradiation. Biomimetic CeO_2 materials displayed the superior photocatalytic activity for the hydrogen production by water splitting under the sunlight irradiation, the hydrogen yield could reach 400 μmol/g catalyst after 6 h.
Biomimetic nano CeO2 materials were prepared by using bean sprouts as bio-template through impregnation and thermal decomposition. For characterization of structure, X-ray diffraction spectroscopy (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy The results demonstrated that the samples prepared at 550 ℃ not only completely removed the original bio-template, but also retained the morphology and microstructure of bean sprouts. Then the biomorphic structure of fluorite structure CeO 2 material was obtained. Micro-pores with a diameter of about 2-3 nm were distributed among the particles, which provided more favorable channel for the photocatalytic reaction. clear red shift (50 nm) compared with powder CeO 2, which could be excited by visible irradiation. Biomimetic CeO 2 ma terials displayed the superior photocatalytic activity for the hydrogen production by water splitting under the sunlight irradiation, the hydrogen yield could reach 400 μmol / g catalyst after 6 h.