Yolk-shell structured Fe3O4@C@F-TiO2 microspheres with surface fluorinated as recyclable visible-light driven photocatalysts
Yolk-shell structured Fe3O4@C@F-TiO2 microspheres with surface fluorinated as recyclable visible-light driven photocatalysts
复制标题
表面氟化的蛋黄壳结构 Fe3O4@C@F-TiO2 微球作为可回收可见光驱动光催化剂
DOI：
10.1016/j.apcatb.2013.12.050
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Huang Yuan
中科院分区：
文献类型：
--
作者：
Liu Guigao;He Fang（导师）;Zhang Jing;Li Lijun;Li Fengjiao;Chen Lixia;Huang Yuan
采用简单改进的溶剂热法成功制备了具有多层蛋黄壳结构的磁性Fe 3 O 4 @ C@ Fluorated-TiO 2（Fe 3 O 4 @C@ F-TiO 2）微球。含有大量亲水基团的碳中间层诱导TiO 2在其表面生长，并在溶剂热刻蚀过程中起到保护Fe 3 O 4核心免受过度侵蚀和保持中空结构完整性的关键作用，同时作为电子受体，它可以降低电子-空穴复合速率。在HF存在下，由于氟化物介导的快速溶解和重结晶过程，所得TiO 2壳层的结晶增强，并且通过F-与羟基之间的配体取代反应，在TiO 2表面形成了大量的三键Tisingle F基团。同时，Fe_3 O_4 @C @ F-TiO_2微球在保持良好的磁分离性能的前提下，Fe_3 O_4 @C@ F-TiO_2微球的比表面积增加了167.50 m2/g，形成了蛋黄壳结构。由于Fe 3 O 4 @C@ F-TiO 2微球具有高效的分子传输和吸附能力，以及碳改性和表面修饰的协同作用，因此其在可见光催化降解罗丹明B的活性上级市售的P25 TiO 2催化剂。
The uniform magnetic Fe3O4@C@fluorinated-TiO2(Fe3O4@C@F-TiO2) microspheres with multilevel yolk–shell structures were successfully prepared by a simple and improved solvothermal method. The carbon mid-layer containing numerous hydrophilic groups induces TiO2growth onto its surface and plays a crucial role in protecting Fe3O4cores from excessive erosion and keeping the integrity of the hollow structure during the solvothermal etching process, meanwhile as an electron acceptor it can reduce electron–hole recombination rate. In the presence of HF, the obtained TiO2shell possesses an enhanced crystallization resulting from the rapidin situfluoride-mediated dissolution and recrystallization processes, and plenty of triple bondTisingle bondF groups are formed on TiO2surface through the ligand replacement reaction between F−and hydroxyl group. Furthermore, Fe3O4cores will be partly etched by HF leading to the yolk–shell structure of an increased surface area of 167.50 m2/g while Fe3O4@C@F-TiO2microspheres still maintain excellent magnetic separability. Due to the efficient molecular transportation and adsorption, and the synergic effect of carbon modification and surface fluorination of TiO2, the Fe3O4@C@F-TiO2microspheres have been demonstrated to possess superior visible-light driven photocatalytic activity in degradation of Rhodamine-B than commercial P25 TiO2catalysts.