A series of novel porous center-hollow ZnO/ZnSe microspheres were synthesized via two-step hydrothermal and ion-exchange method. It is found the load of ZnSe improves photocatalytic activity of the nanocomposites and ZSe-3 sample shows the most prominent performance, 88.8% of Cr(VI) can be reduced in 60 min under the irradiation of visible light (λ > 420 nm). ZnSe nanoparticles can be used to sensitize the ZnO microspheres and further extend the visible light response range. The n-p heterojunction formed at the interface between ZnO and ZnSe can also contribute to improve the separation and transfer properties of charge carriers in ZnO.

中文翻译：

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借助ZnO / ZnSe分级np异质结增强可见光驱动的Cr（VI）还原

通过两步水热和离子交换法合成了一系列新颖的多孔中心空心ZnO / ZnSe微球。发现ZnSe的负载改善了纳米复合材料的光催化活性，ZSe-3样品表现出最突出的性能，在可见光（λ> 420 nm）照射下60分钟内可以还原88.8％的Cr（VI）。ZnSe纳米颗粒可用于敏化ZnO微球并进一步扩展可见光响应范围。在ZnO和ZnSe之间的界面处形成的np异质结也有助于改善ZnO中电荷载流子的分离和转移特性。