Here, a new three-dimensional (3D) multi-shell Fe₃O₄/SiO₂/ZnO/ZnSe (FSZ-ZnSe) photocatalyst with a type II heterostructure was successfully produced by a convenient synthetic route. The amount of ZnSe particles can be regulated by varying the reactant concentration, and five kinds of FSZ-ZnSe samples (FSZ-ZnSe0, FSZ-ZnSe1, FSZ-ZnSe2, FSZ-ZnSe3 and FSZ-ZnSe4) were obtained. The photocatalytic performances of all as-prepared samples under UV and visible light irradiation were evaluated by the photocatalytic elimination of rhodamine B (RhB) aqueous solution. No matter which light source was used, the FSZ-ZnSe3 sample exhibited enhanced photocatalytic activity in comparison with other samples, benefiting from the sensitization of a proper amount of ZnSe particles, which not only facilitated the separation of photo-induced carriers but also extended the light absorption. Moreover, compared to visible light radiation, the FSZ-ZnSe3 sample under UV light showed remarkably enhanced degradation efficiency toward RhB base on the Z-scheme type transfer of photo-generated electron-hole pairs. The Z-scheme mechanism was confirmed using radical trapping experiments and hydroxyl radical (OH) formation determination study. Meanwhile, the FSZ-ZnSe3 sample exhibited excellent magnetic response and high stability during the recycling photocatalytic experiments.

在这里，新的三维（3D）多壳Fe ₃ O ₄ / SiO ₂通过便利的合成途径成功制备了具有II型异质结构的/ ZnO / ZnSe（FSZ-ZnSe）光催化剂。可以通过改变反应物浓度来调节ZnSe颗粒的数量，从而获得五种FSZ-ZnSe样品（FSZ-ZnSe0，FSZ-ZnSe1，FSZ-ZnSe2，FSZ-ZnSe3和FSZ-ZnSe4）。通过罗丹明B（RhB）水溶液的光催化消除，评估了所有制备的样品在紫外线和可见光照射下的光催化性能。无论使用哪种光源，FSZ-ZnSe3样品均比其他样品表现出增强的光催化活性，这得益于适量的ZnSe颗粒的敏化作用，这不仅促进了光致载流子的分离，而且延长了光吸收。而且，与可见光辐射相比，基于光生电子-空穴对的Z型转移，FSZ-ZnSe3样品在紫外光下显示出显着提高的向RhB的降解效率。Z方案的机制已通过自由基捕获实验和羟基自由基（OH）形成测定研究。同时，在循环光催化实验中，FSZ-ZnSe3样品表现出优异的磁响应和高稳定性。