制备具有高效光催化活性的 Z 型磁性 MoS/CoFeO 纳米复合材料。
Fabrication of Z-scheme magnetic MoS/CoFeO nanocomposites with highly efficient photocatalytic activity.
机构信息
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; Graduate School of the Chinese Academy of Sciences, Beijing 100039, China.
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
出版信息
J Colloid Interface Sci. 2018 Mar 15;514:664-674. doi: 10.1016/j.jcis.2017.12.079. Epub 2017 Dec 29.
MoS thin nanosheets decorated with CoFeO nanoparticles have been successfully synthesized via a simple hydrothermal method. The nanocomposites are characterized by XRD, TEM, HRTEM, BET, XPS, UV-Vis DRS, PL and magnetic property analysis. The Z-scheme mechanism at the interface of MoS and CoFeO is formed. When the mass ratio of MoS and CoFeO is 1:3, the MoS/CoFeO nanocomposites present excellent photocatalytic performance. The degradation rate of rhodamine B (RhB) and congo red (CR) is 93.80% and 94.43% in 90 and 50 min, respectively, under visible light irradiation. The highly photocatalytic activity could be mainly ascribed to the formed Z-scheme mechanism which facilitates the separation of photoinduced electron-hole pairs. Besides, the MoS thin nanosheets not only provide the most active sites for photocatalytic reactions, but also act as the backing material for CoFeO nanoparticles to effectively disperse and avoid the magnetic aggregation. Moreover, the MoS/CoFeO nanocomposites present a good recyclability and the degradation rate of RhB and CR is still beyond 82% after seven runs. In addition, the nanocomposites can be easily separated by an external magnet.
通过简单的水热法成功合成了 MoS 薄纳米片负载 CoFeO 纳米粒子的复合材料。通过 XRD、TEM、HRTEM、BET、XPS、UV-Vis DRS、PL 和磁性分析对纳米复合材料进行了表征。在 MoS 和 CoFeO 的界面形成了 Z 型机制。当 MoS 和 CoFeO 的质量比为 1:3 时，MoS/CoFeO 纳米复合材料在可见光照射下对罗丹明 B（RhB）和刚果红（CR）的降解率分别达到 93.80%和 94.43%，在 90 和 50 min 内。高的光催化活性主要归因于形成的 Z 型机制，有利于光生电子-空穴对的分离。此外，MoS 薄纳米片不仅为光催化反应提供了最活跃的场所，而且还作为 CoFeO 纳米粒子的支撑材料，有效地分散并避免了磁性聚集。此外，MoS/CoFeO 纳米复合材料具有良好的可回收性，在经过七次循环后，RhB 和 CR 的降解率仍超过 82%。此外，纳米复合材料可以通过外部磁铁很容易地分离。
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