中文摘要：

以聚乙烯醇/醋酸钴复合纳米纤维为模板,采用模板辅助共沉积技术制备了三维尖晶石型Co3O4纳米纤维/晶须分级结构.并采用SEM,XRD对其形貌和晶型结构进行了表征.在光催化降解亚甲基蓝（MB）性能实验中,三维分级结构Co3O4表现出比纳米粒子和纤维更好的光催化性能.这主要归因于Co3O4纳米线的次级结构和开放的三维网络结构有利于MB分子和氧分子的扩散和传输,从而增强MB的光降解反应速率.

英文摘要：

Three-dimensional Co3O4 hierarchical structures were prepared by a combination of an electro-spinning method and co-precipitation reaction and characterized by scanning electron microscopy and XRD.The photocatalytic decomposition of Methylene blue（MB） on Co3O4 sample was investigated at room tem-perature.The hierarchical structured Co3O4 sample shows an enhanced photocatalytic performance com-pared with the other nanostructured Co3O4 powders of nanoparticles,and nanofibers,which can be attributed to the special structural feature with an open and secondary Co3O4 nanowire that significantly facilitates the diffusion and mass transportation of MB molecules and oxygen species in photochemical reaction of MB degradation.