Fe_3O_4@TiO_2光催化剂的制备及其性能研究

Preparation and photocatalytic activity of Fe_3O_4@TiO_2 photocatalyst

采用溶剂热法制备了Fe3O4磁性纳米颗粒,通过溶胶-凝胶法在Fe3O4表面包覆一层Ti O2,并对其进行水热处理,制备了核壳结构光催化剂Fe3O4@Ti O2。利用透射电镜(TEM)分析了其形貌、并用X射线衍射(XRD)分析了其物相组成,利用紫外-可见光谱(UV-Vis)研究了其光谱特征,以罗丹明B(RB)模型污染物,在紫外光照射下评价了纳米Fe3O4@Ti O2的光催化活性,探讨了其重复使用的可能性。结果表明:Ti O2均匀包覆在Fe3O4表面,形成核壳结构,Ti O2转变为锐钛矿型;光催化结果显示Fe3O4@Ti O2在60 min内对RB降解率为97.2%,该材料结合了光催化与可再生的优点,5次循环使用后降解率仍保持在92.3%。

Fe3O4nanoparticles were prepared by solvothermal reaction. Fe3O4@ Ti O2core-shell photocatalyst was synthesized by solgel method,then they were subjected to a hydrothermal treatment. The samples were characterized by X-ray diffraction,transmission electronmicroscopy and ultraviolet-visible absorption. The photocatalytic activities of prepared samples were evaluated by photodegradation of Rhodamine B. The results show that Fe3O4 was coated by uniform anatase Ti O2. RB can be effectively degraded by97. 2%under UV light within 60 min. A degradation rate of 93. 2%can be maintained after 5 cycles.