Synthesis of biomimetic cerium oxide by bean sprouts bio-template and its photocatalytic performance

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• 作者：Mengkai ZHOU (周梦凯)^a ; Kai ZHANG (张 凯)^a ; Feng CHEN (陈 丰)^b ; Zhigang CHEN (陈志刚)^a ; ^b ; ^{czg@ujs.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：bio-template ; nano materials ; photocatalysis ; hydrogen production ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：34
• 期：7
• 页码：683-688
• 全文大小：1063 K

文摘

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 (TEM), UV-Vis diffuse reflectance spectra (UV-Vis/DRS) nitrogen adsorption-desorption measurements and Labsolar H₂ system were adopted. The results demonstrated that the samples prepared at 550 °C 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 CeO₂ 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 CeO₂ materials exhibited clear red shift (50 nm) compared with powder CeO₂, which could be excited by visible irradiation. Biomimetic CeO₂ 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.