柳叶状二氧化铈的制备及其光催化性能

Preparation and Photocatalytic Property of Salix-Leaf Like CeO2

在聚乙烯吡咯烷酮(PVP)存在及室温条件下,通过超声法,使硝酸铈与草酸反应得到柳叶状草酸铈前驱体.将前驱体煅烧,制备得到形貌遗传的柳叶状多孔二氧化铈(CeO2).采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)以及N2吸附-脱附等手段对所制备CeO2进行了表征.结果表明,所制备柳叶状CeO2由大小为10-12 nm的纳米晶颗粒组成,具有较窄的孔径分布,孔径在2-15nm之间,其比表面积为22.73 m2/g.在紫外光作用下,所制备CeO2对于罗丹明B有一定的光催化降解作用.

In the presence of polyvinylpyrrolidone(PVP) and at room temperature, by using ultrasonic method, salix-leaf like cerium oxalate precursor was prepared thorough cerium nitrate reacted with oxalic acid. After calcination precursor, CeO2 was obtained, which inherited the salix-leaf like morphology from the precursor. The CeO2was characterized by means of X-ray diffraction(XRD), scanning electron microscope(SEM), transmission electron microscope(TEM) and N2 adsorption-desorption isotherms. The results showed that the as-prepared CeO2 were made of numerous nanocrystal particles with a crystallite size of about 10-12 nm. The mesoporous CeO2 displayed a surface area of 22.73 m2/g and pore diameters of 2-15 nm. Under UV radiation, the CeO2 exhibited photocatalytic property for degrading Rhodamine B(RhB) solution.