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    Volume 30 Issue 1
    Jan.  2023

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    Jingshu Yuan, Yao Zhang, Xiaoyan Zhang, Liang Zhao, Hanlin Shen, and Shengen Zhang, Template-free synthesis of core–shell Fe3O4@MoS2@mesoporous TiO2 magnetic photocatalyst for wastewater treatment, Int. J. Miner. Metall. Mater., 30(2023), No. 1, pp. 177-191. https://doi.org/10.1007/s12613-022-2473-9
    Cite this article as:
    Jingshu Yuan, Yao Zhang, Xiaoyan Zhang, Liang Zhao, Hanlin Shen, and Shengen Zhang, Template-free synthesis of core–shell Fe3O4@MoS2@mesoporous TiO2 magnetic photocatalyst for wastewater treatment, Int. J. Miner. Metall. Mater., 30(2023), No. 1, pp. 177-191. https://doi.org/10.1007/s12613-022-2473-9
    引用本文 PDF XML SpringerLink
    研究论文

    无模板合成磁性核壳Fe3O4@MoS2@介孔TiO2光催化剂及其在废水处理中的应用

      * 共同第一作者
    • 通讯作者:

      张深根    E-mail: zhangshengen@mater.ustb.edu.cn

    文章亮点

    • (1) 提出了一种简单、绿色、无模板的方法用于制备磁性核壳FMmT光催化剂。
    • (2) 首次引入MoS2活性中间层以避免Fe3O4@TiO2发生光致解离。
    • (3) TiO2壳层的介孔网络结构可有效提高FMmT的光催化活性。
  • 二氧化钛(TiO2)光催化剂在环境修复领域被重点关注和广泛研究。然而,仅响应紫外光(<5%的太阳光)、光生电荷分离效率低和回收困难等缺点严重阻碍了其实际应用。本文通过结合简单、绿色、无模板的溶剂热法和超声水解法制备出可磁分离的Fe3O4@MoS2@介孔TiO2 (FMmT)光催化剂。研究发现,FMmT具有更大的比表面积(55.09 m2·g−1),更强的可见光响应能力(~521 nm)以及更高的光生电荷分离效率。此外,光照300 min后,FMmT对亚甲基蓝(MB)、罗丹明B(RhB)和四环素(TC)的光催化降解效率分别为99.4%、98.5%和89.3%,相应的降解速率常数分别是纯TiO2的4.5、4.3和3.1倍。由于具有高饱和磁化强度(43.1 A·m2·kg−1),FMmT可在外加磁场作用下实现有效回收。光催化活性的提高与活性中间层(MoS2)对光生电子的有效传输以及异质结(MoS2@TiO2)对电子–空穴的高效分离密切相关。同时,介孔TiO2壳层优异的光捕集能力和丰富的反应位点可使FMmT的光催化效率得到进一步提高。本工作首次提出将MoS2作为活性中间层,并将其与介孔TiO2壳层相结合,为磁性光催化剂的设计和性能优化提供了新方法和实验依据。
  • Research Article

    Template-free synthesis of core–shell Fe3O4@MoS2@mesoporous TiO2 magnetic photocatalyst for wastewater treatment

    + Author Affiliations
    • TiO2 is the dominant and most widely researched photocatalyst for environmental remediation, however, the drawbacks, such as only responding to UV light (<5% of sunlight), low charge separation efficiency, and difficulties in recycling, have severely hindered its practical application. Herein, we synthesized magnetically separable Fe3O4@MoS2@mesoporous TiO2 (FMmT) photocatalysts via a simple, green, and template-free solvothermal method combined with ultrasonic hydrolysis. It is found that FMmT possesses a high specific surface area (55.09 m2·g−1), enhanced visible-light responsiveness (~521 nm), and remarkable photogenerated charge separation efficiency. In addition, the photocatalytic degradation efficiencies of FMmT for methylene blue (MB), rhodamine B (RhB), and tetracycline (TC) are 99.4%, 98.5%, and 89.3% within 300 min, respectively. The corresponding degradation rates are 4.5, 4.3, and 3.1 times higher than those of pure TiO2 separately. Owing to the high saturation magnetization (43.1 A·m2·kg−1), FMmT can achieve effective recycling with an applied magnetic field. The improved photocatalytic activity is closely related to the effective transport of photogenerated electrons by the active interlayer MoS2 and the electron–hole separation caused by the MoS2@TiO2 heterojunction. Meanwhile, the excellent light-harvesting ability and abundant reactive sites of the mesoporous TiO2 shell further boost the photocatalytic efficiency of FMmT. This work provides a new approach and some experimental basis for the design and performance improvement of magnetic photocatalysts by innovatively incorporating MoS2 as the active interlayer and integrating it with a mesoporous shell.
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