Synthesis of urchin-like Fe3O4@SiO2@ZnO/CdS core-shell microspheres for the repeated photocatalytic degradation of rhodamine B under visible light
Synthesis of urchin-like Fe3O4@SiO2@ZnO/CdS core-shell microspheres for the repeated photocatalytic degradation of rhodamine B under visible light
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海胆状Fe3O4@SiO2@ZnO/CdS核壳微球的合成及其在可见光下反复光催化降解罗丹明B
DOI：
10.1039/c5cy02090e
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发表时间：
2016
影响因子：
5
通讯作者：
Song Hang
中科院分区：
文献类型：
--
作者：
Yang Jinghai;Wang Jian;Li Xiuyan;Wang D;an;Song Hang
在此基础上，我们设计并合成了海胆状Fe3O4@SiO2@ZnO/CdS核壳微球，成功地将多种功能组分整合到单一的微复合材料中。通过各种分析技术对这些核壳微球的形态、组成、光学和磁性进行了表征。在可见光照射下，以罗丹明B（RhB）为目标物，考察了其光催化性能。与Fe3O4@SiO2@ZnO微球相比，Fe3O4@SiO2@ZnO/CdS微球的可见光光催化活性显著提高，这得益于CdS的敏化作用，可以延长可见光吸收，有利于光生载流子的分离。CdS在核壳微球中的量可以通过调节SILAR循环来控制。考察了CdS负载量对光催化活性的影响，结果表明，当CdS的质量分数为10.1%时，Fe3O4@SiO2@ZnO/CdS的光催化活性最好。此外，值得注意的是，这些多功能微球表现出优异的磁响应和高稳定性。该核壳型光催化剂在连续运行5次后仍能保持较高的光催化活性。
Herein, we developed the design and synthesis of urchin-like Fe3O4@SiO2@ZnO/CdS core–shell microspheres, in which the multiple functional components were integrated successfully into a single microcomposite. The morphology, composition, and optical and magnetic properties of those core–shell microspheres were characterized by various analytical techniques. Photocatalytic performances were evaluated by the photocatalytic elimination of rhodamine B (RhB) under visible light irradiation. Compared with the Fe3O4@SiO2@ZnO microspheres, the Fe3O4@SiO2@ZnO/CdS microspheres show remarkably enhanced visible light photocatalytic activity, benefiting from the sensitization of CdS, which can extend the visible light absorption and facilitate the separation of photoinduced carriers. The amount of CdS in the core–shell microspheres can be controlled by adjusting the SILAR cycles. The effect of the CdS loading amount on the photocatalytic activity was also investigated and the results indicate that Fe3O4@SiO2@ZnO/CdS with 10.1 wt% CdS exhibits the best photocatalytic ability. Furthermore, it is worth noting that these multifunctional microspheres exhibit excellent magnetic response and high stability. The core–shell photocatalysts can also maintain high photocatalytic activity even after running for five cycles.