三维分级结构ZnO的制备及光催化性能

以聚乙烯醇/醋酸锌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ZnO纳米线/纳米纤维分级结构, 并采用SEM, XRD对其形貌和晶型结构进行了表征. 在光催化降解乙醛性能实验中, 三维分级结构ZnO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ZnO纳米线的次级结构和开放的三维网络结构更有利于乙醛分子和氧分子的扩散和传输, 从而提高了乙醛的光降解速率.

Fabrication and Photocatalytic Property of Three-dimensional ZnO Hierarchical Structure

Three-dimensional ZnO hierarchical structures with high densities of secondary ZnO nanowires grown on primary ZnO fibers were fabricated through a co-precipitation reaction growth on the electrospinning PVA/zinc acetate nanofibers template followed by an annealing process in air.The structural analyses showed that as-prepared amorphous ZnC 2O 4 nanowires converted into wurtzite ZnO after annealing.The morphology of the ZnO hierarchical structures could be further controlled by adjusting the molar ratio of H 2C 2O 4 to EtOH.The hierarchical structured ZnO sample shows an enhanced photocatalytic performance compared with the other nanostructured ZnO powders of nanoparticles,and nanofibers,which can be attributed to the special structural feature with an open and secondary ZnO nanowire that significantly facilitates the diffusion and mass transportation of acetaldehyde molecules and oxygen species in photochemical reaction of acetaldehyde degradation.