Electrospun TiO2 nanofibers integrating space-separated magnetic nanoparticles and heterostructures for recoverable and efficient photocatalyst
Electrospun TiO2 nanofibers integrating space-separated magnetic nanoparticles and heterostructures for recoverable and efficient photocatalyst
复制标题
静电纺丝 TiO2 纳米纤维集成了空间分离的磁性纳米粒子和异质结构，用于可回收且高效的光催化剂
DOI：
10.1039/c4ta02224f
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发表时间：
2014-01-01
影响因子：
11.9
通讯作者：
Liu, Jinghai
中科院分区：
文献类型：
--
作者：
Baiyila, Dahu;Wang, Xiaohui;Liu, Jinghai
将空间分离的磁性纳米颗粒和异质结构相结合的TiO 2纳米纤维被制备成具有优异光催化活性和磁可恢复性的多功能光催化剂。采用静电纺丝技术制备了Fe 3 O 4包埋的TiO 2（Fe3O4@TiO2）磁性纳米纤维。采用水热法在Fe3O4@TiO2纳米纤维上沉积CdS纳米粒子，得到了TiO 2/CdS异质结构（Fe3O4@TiO2/CdS）。异质结构的形成提高了光催化活性，拓宽了对太阳光的响应范围。在可见光照射下，Fe3O4@TiO2/CdS纳米纤维的光催化活性是Fe3O4@TiO2纳米纤维的5.11倍，是CdS纳米颗粒的1.22倍。在模拟太阳光照射下，光催化降解率略有增加，是可见光照射下的1.1倍。CdS的负载量仅对可见光和模拟太阳光下的光催化活性有影响。Fe_3O_4@TiO_2/CdS复合材料的饱和磁化强度为1.572 emu g（-1），可以通过非接触磁场毫不费力地分离和回收。循环稳定性在磁性分离和回收后是持久的。
TiO2 nanofibers integrating space-separated magnetic nanoparticles and heterostructures have been fabricated to construct multifunctional photocatalysts with excellent photocatalytic activity and magnetic recoverability. The electrospinning technique has been employed to prepare the Fe3O4-embedded TiO2 (Fe3O4@TiO2) magnetic nanofibers. TiO2/CdS heterostructures (Fe3O4@TiO2/CdS) formed by depositing CdS nanoparticles onto the Fe3O4@TiO2 nanofibers have been obtained by a hydrothermal process. The heterostructures improve the photocatalytic activity and widen the range of solar light response. Under visible light irradiation, the photocatalytic activity of the Fe3O4@TiO2/CdS nanofibers is 5.11 times higher than that of the Fe3O4@TiO2 nanofibers and is 1.22 times than that of CdS nanoparticles. In addition, it exhibits a slight increase under simulated solar light with the photocatalytic degradation ratio 1.1 times higher than that under visible light. The loading amounts of CdS only have effects on the photocatalytic activity under visible light and simulated solar light. The Fe3O4@TiO2/CdS nanofiber exhibits a saturation magnetization strength of 1.572 emu g(-1) and can be effortlessly separated and recovered by applying a contactless magnetic field. The cycling stability is durable after magnetic separation and recycling.