Fe3O4@SiO2@ZnO/ZnS纳米复合材料的制备及性能研究

Preparation and properties of Fe3O4@SiO2@ZnO/ZnS nanocomposites

选用Fe3O4@SiO2@ZnO作为基体材料,采用一步硫化法成功制备出Fe3O4@SiO2@ZnO/ZnS纳米复合材料.通过XRD、SEM、TEM和XPS测试表征手段证实了ZnO的表面已转化成ZnS,构建出ZnO/ZnS核壳结构.VSM测试结果表明,制得的Fe3O4@SiO2@ZnO/ZnS纳米复合材料具有明显的超顺磁性,利于材料的回收再利用.在Fe3O4@SiO2@ZnO/ZnS纳米复合材料的紫外-可见吸收光谱中,不仅观测到了ZnO和ZnS的特征吸收边,而且在可见光区域出现了明显增强的吸收边.通过对四环素的可见光催化降解实验,证实了Fe3O4@SiO2@ZnO/ZnS纳米复合材料具有优异的可见光催化活性.

Herein,Fe3O4@SiO2@ZnO nanocomposites had been chosen as the basis materials to successfully synthesize Fe3O4@SiO2@ZnO/ZnS nanocomposites via the one-step sulfidation method.The XRD、SEM、TEM and XPS experimental results showed that the surface of the ZnO had been converted to ZnS,forming ZnO/ZnS core/shell heterostructures.VSM test results showed that the Fe3O4@SiO2@ZnO/ZnS nanocomposites had superior superparamagnetism,which would be beneficial for the recycling and reuse of the materials.In the UV-vis absorption spectrum of Fe3O4@SiO2@ZnO/ZnS,not only the characteristic absorption edges of ZnO and ZnS were observed,but also the significantly enhanced absorption edges appeared in the visible region.The Fe3O4@SiO2@ZnO/ZnS nanocomposites displayed excellent visible photocatalytic activity in the catalytic degradation experiment of tetracycline.