金属氧化物纤维的制备及其光降解甲基橙催化性能的研究

摘要

分别以羊绒、蚕丝和微晶纤维素为模板,以Ce3+和Ni2+硝酸盐为前驱体,制备CeO 2和NiO纤维,采用环境扫描电镜和X射线衍射表征其形貌和结构.以难降解有机物甲基橙为模型,考察不同生物模板复制氧化物纤维材料的光催化性能.结果表明,CeO 2和NiO纤维都保持了原模板纤维的微结构特征.模板纤维的存在与否不影响CeO2和NiO纤维的晶型结构,但模板复制出的氧化物的结晶度较低,且晶粒尺寸较小.CeO 2的光催化性能明显优于NiO,且以微晶纤维素为模板复制的CeO 2的光催化性能最佳.%CeO 2 and NiO were prepared by using Ce3 + and Ni2 + nitrate salts as precursors. The morpholo-gy and structure were characterized by scanning electron microscopy (SEM)and X-ray diffraction (XRD). The photocatalytic performance of the modified oxide fibers was investigated by using the methyl orange as a model. The results show that both CeO2 and NiO maintain the microstructure characteristics of the original template fibers. The presence or absence of the template fibers does not affect the crystalline structure of CeO2 and NiO,but the crystallographic properties of the oxides are low and the grain size is small. The photocatalytic activity of CeO2 is better than that of NiO,and the photocatalytic activity of CeO is better with microcrystalline cellulose as template.