Controllable fabrication of nanomaterials with hierarchical architecture have received much attention in the field of photocatalysis due to their enhanced light-harvesting efficiency. Moreover, fabricating direct Z-scheme heterojunctions have been proven to be effective way to enhance the photocatalytic performance of photocatalysts. Herein, hierarchically hollow WO₃ nanoflower was successfully synthesized by a simple hydrothermal treatment of tungsten chloride (WCl₆) in ethanol solution. Decoration of the obtained WO₃ with AgI nanoparticles in situ can form the Z-scheme AgI/WO₃ hollow hierarchical nanoflowers (AgI/WO₃ HHNFs). The AgI/WO₃ HHNFs exhibited excellent photocatalytic activity and remarkable stability for the degradation of tetracycline hydrochloride (TC-HCl) and Eosin B (EB) under the irradiation of a low energy consume light (LED lamp, 5 W). Interestingly, compared to pure AgI nanoparticles, 3D hollow WO₃ nanoflowers and AgI/WO₃ nanosheets, the AgI/WO₃ HHNFs revealed conspicuously enhanced photocatalytic activity. This phenomenon could be associated to three aspects, namely the high light-harvesting efficiency, increased light trapping and scattering capability and strongly coupled Z-scheme heterointerface, which effectively improved the photoelectron-hole sepreation efficiency. Our work therefore provide a novel insight for the fabrication of 3D hollow hierarchical structures.

具有分层结构的纳米材料的可控制备由于其提高的光收集效率而在光催化领域受到了广泛关注。而且，已经证明制造直接的Z-方案异质结是增强光催化剂的光催化性能的有效方法。在此，通过在乙醇溶液中对氯化钨（WCl ₆）进行简单的水热处理，成功地合成了层次空心的WO ₃纳米花。用AgI纳米颗粒原位装饰获得的WO ₃可以形成Z方案AgI / WO ₃空心分层纳米花（AgI / WO ₃ HHNF）。AgI / WO ₃HHNFs在低能量消耗的光（LED灯，5 W）的照射下，对四环素盐酸盐（TC-HCl）和曙红B（EB）的降解表现出优异的光催化活性和显着的稳定性。有趣的是，与纯AgI纳米颗粒，3D中空WO ₃纳米花和AgI / WO ₃纳米片相比，AgI / WO ₃ HHNFs显着增强了光催化活性。这种现象可能与三个方面有关，即高的集光效率，增加的光俘获和散射能力以及强耦合的Z-方案异质界面，从而有效地提高了光电子-空穴分离效率。因此，我们的工作为3D空心层次结构的制造提供了新颖的见解。