可磁分离TiO_2/BiOI复合纤维的制备及光催化性能  

Synthesis and Photocatalytic Properties of Magnetic Recoverable TiO_2/BiOI Composite Nanofibers

作　　者：王康 杜慧玲[1] 崔雯娜 常梦洁[1] 刘俊[1] WANG Kang;DU Hui-ling;CUI Wen-na;CHANG Meng-jie;LIU Jun(College of Materials Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]西安科技大学材料科学与工程学院,西安710054

出　　处：《人工晶体学报》2019年第2期268-273,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(21501140)

摘　　要：本工作合成了一种可磁分离TiO_2/BiOI复合纳米纤维(TiO_2/Fe_3O_4/BiOI),并研究了其可见光催化性能。通过静电纺丝技术获得TiO_2纳米纤维,采用溶剂热法在TiO_2纳米纤维表面生长Fe_3O_4纳米颗粒,最后,在磁场辅助下,通过连续离子吸附反应(SILAR)法在TiO_2/Fe_3O_4表面生长了BiOI纳米片。结果表明,Fe_3O_4纳米颗粒直径均一,均匀分布在TiO_2纳米纤维表面。BiOI纳米片呈交错状垂直沉积在TiO_2纳米纤维表面,BiOI纳米片的负载量可以通过SILAR的循环次数控制。光催化测试表明,由于BiOI对可见光吸收的增加,以及与TiO_2间形成的半导体异质结,TiO_2/Fe_3O_4/BiOI复合纳米纤维的光催化效率均高于TiO_2/Fe_3O_4纳米纤维。此外,TiO_2/Fe_3O_4/BiOI对外磁场有强的响应,易于进行磁分离回收。The synthesis of magnetic recoverable TiO 2/BiOI nanofibers (TiO 2/Fe 3O 4/BiOI) for visible light photocatalysis application were reported. TiO 2 nanofibers were prepared by using electrospinning method. Then Fe 3O 4 nanoparticles were modified on the TiO 2 fiber surface by solvothermal method. Finally, TiO 2/Fe 3O 4/BiOI composite nanofibers were prepared by successive ion layer absorb and reaction (SILAR) assisted with magnetic field. It was stated that Fe 3O 4 nanoparticles with narrow size distribution were uniformly modified on the TiO 2 fiber surface. BiOI nanosheets were grown vertically on the TiO 2 fiber surface, and the BiOI quantity could be controlled by the SILAR cycles. Due to the strong visible light absorption and p-n junction between TiO 2 and BiOI, TiO 2/Fe 3O 4/BiOI shows enhanced visible light photocatalysis performance than TiO 2/Fe 3O 4 fibers. Moreover, the strong magnetic field response makes the TiO 2/Fe 3O 4/BiOI could be seperated and recycled easily.

关 键 词：二氧化钛 碘氧化铋 磁分离 可见光催化 

分 类 号：O611.4[理学—无机化学]