生物鸡蛋内膜结构氧化铈材料的合成与表征

Synthesis and Characterization of ESM-morphic Fibrous CeO_2

采用生物废弃材料鸡蛋内膜为模板,选取适当浓度的硝酸铈溶液,调节pH值,通过两步浸渍,经有机-无机界面上的表面化学及生物化学过程的交互作用,使生物膜与稀土元素铈均匀结合,并于550℃煅烧,合成了管状分级多孔氧化铈纳米材料.通过傅里叶变换红外光谱(FTIR)、热重分析(TGA)和场发射扫描电镜(FESEM)等测试手段对材料进行了表征.结果表明,该材料具有独特的纤维网络状生物形貌,是由内径500 nm、管壁厚约为250 nm的微米级氧化铈中空管所组成,其壁上含有大量1～5 nm孔径的颗粒堆积孔.考察了该材料对酸性品红染料脱色反应的催化活性,结果表明,当酸性品红浓度为20 mg/L和催化剂用量为0.2 g/L时,反应120 min后染料脱色率可达到90%以上.

The egg shell membrane（ESM）,a biological waste product,was used as a natural bio-template.Through a two-step infiltration process based on the surface chemistry and biochemistry interactions involved in organic-inorganic interface,cerium ion combined with biomembrane evenly by controlling cerous nitrate solu-tion concentration,impregnant pH value.Hierarchical fibrous nano-porous ceria was prepared after being cal-cined at 550 ℃.Unique bio-morphic microstructures with interwoven networks were synthesized and charac-terized by Fourier transform infrared spectroscopy（FTIR）,thermogravimetric analysis（TGA）,field emission scanning electron microscope（FESEM） and so on.Ceria was characterized by repetitious networks consisting of the porous hollow tubes with external diameter of about 1 μm and inner diameter of about 250 nm and the tube wall was studied with piled pores which had 1—5 nm aperture.While the concentration of acid fuchsine is 20 mg/L,catalyst amount 0.2 g/L,the reaction had a higher decoloring rate in shorter time,the decoloring rate can reach over 90% after 120 min.