| 酵母菌模板法制备CeO2空心微球及其光催化性能 |
| Synthesis and Photocatalytic Activity of CeO2 Hollow Microspheres via Yeast Template Route |
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| 摘要: 以酵母菌为生物模板辅助沉淀法制备了CeO2空心微球。采用傅里叶转换红外光谱（FT-IR）、X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和氮气吸附-脱附等对样品进行了表征，结果表明，在600℃煅烧后得到了CeO2空心微球，其形态与酵母菌一致为椭球体，球壳是由大小约为25 nm的CeO2纳米颗粒组成，比表面积为22 m2·g-1，远大于未用模板制备的CeO2微粒的比表面积。通过紫外-可见漫反射测定，得到CeO2空心微球的禁带宽度为3.03 eV，相比于相同条件下合成的无模板CeO2禁带宽度（3.42 eV）明显减小。室温下用模拟太阳光照射降解酸性橙7（AO 7）对样品的光催化性能进行了测试，结果表明，在照射120 min之后降解率能达到96%以上，降解效果明显高于未使用模板的CeO2微粒。对CeO2空心微球的形成机理进行了分析。 |
| 关键词: 空心微球 CeO2 酵母菌 生物模板 光催化剂 |
| 基金项目: 国家自然科学基金（No.21271119）资助项目。 |
| Abstract: Cerium dioxide (CeO2) hollow microspheres have been prepared via bio-template and precipitation method using yeast as template. The products were characterized by Fourier transform infrared, X-ray diffraction, X-ray photoelectron spectra, scanning electron microscopy, transmission electron microscopy and N2 adsorption-desorption isotherms. The results showed that the CeO2 hollow microspheres were obtained after calcination at 600℃, and their shapes were approximately ellipsoid same as the yeasts. The shell of the as-prepared hollow microspheres is composed of CeO2 nanoparticles with size of ~25 nm. The specific surface area of the sample is 22 m2·g-1 which is higher than the sample prepared without templates. The band gap energy of the CeO2 hollow microsphere (3.03 eV) is small compared with the samples prepared without templates (3.42 eV) via UV-Vis diffuse reflectance spectrum. The as-prepared CeO2 hollow microspheres exhibit good photocatalytic activity for the degradation of acid orange 7 (AO 7) at room temperature under solar light irradiation. The degradation rate of AO 7 can be 96% after 120 min which is much higher than that of samples prepared without templates. The formation mechanism of CeO2 hollow microspheres has been proposed. |
| Keywords: hollow microsphere CeO2 yeast bio-template photocatalyst |
| 投稿时间：2016-03-05 修订日期：2016-07-30 |
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| 张昔玉,葛圣松,邵谦,刘玫,刘青云.酵母菌模板法制备CeO2空心微球及其光催化性能[J].无机化学学报,2016,32(9):1535-1542. |
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