核-壳结构Fe3O4@C@TiO2复合材料的制备及光催化性能的研究

Preparation and Photocatalytic Properties of Core-shell-structured Fe_3O_4@C@TiO_2 Composite

本文以FeCl3为铁源,葡萄糖为碳源,钛酸四丁酯(TBOT)为钛源,通过水热法与溶胶-凝胶法制备了具有较好核-壳形貌的磁性复合材料Fe3O4@C@TiO2。通过透射电镜(TEM)、扫面电镜(SEM)、X-射线衍射仪(XRD)、超导量子干涉磁强计(SQUID)等对该材料的形貌、结构、磁学性能等进行表征,分析了该复合材料对亚甲基蓝(MB)的降解性能,探讨了其重复使用性。实验结果表明,0.5g/L的Fe3O4@C@TiO2在紫外光下可以在8min内将MB降解95.6%,5次循环使用后降解率仍然保持在93.6%。对比Fe3O4@TiO2可知,碳层的加入有效避免了磁性粒子光溶解现象,提高了光催化剂对亚甲基蓝(MB)的降解性能。表明Fe3O4@C@TiO2复合材料具有良好的磁分离性、光催化活性、稳定性和应用前景。

MagneticFe3O4@C@TiO2nanocomposites with core-shell structure are prepared by a hydrothermal method and sol-gel method with the reaction of FeCI3, glucose and tetrabutyl orthotitanate. The morphology, structure and the magnetic properties of nanocomposites are characterized by transmission electron microscopy（TEM）, scanning electron microscopy（SEM）, X-ray diffraction （XRD） and the magnetization measurement （SQUID）.The photocatalytic activity of Fe3O4@C@TiO2is evaluated by the photodegradation of methylene blue, and the reusability activity is also investigated. The results show that 95.6% of MB molecules can be degraded in the use of 0.5 g/L Fe3O4@C@TiO2 under UV-light irradiation within 8 rain. Compared with Fe304@TiO2, the carbon layer can effectively slack the electron interaction or photodissolution of Fe304 and enhance the photocatalytic activity. TheFe3O4@C@TiO2exhibits efficient magnetic separation, high photocatalytic activity and good chemical stability.