We herein demonstrate the uniform porous hierarchical plate-like BiOCl/2D networks Bi₂S₃ heterostructures realized by a facile two-step hydrothermal technique. The synthesis involved an anion exchange process by reacting pre-synthesized BiOCl irregular octagonal nanoplates with Na₂S₂O₃·5H₂O in an aqueous solution. The experiment results revealed that the 3D plate-like heterostructures were composed of internal BiOCl and outside networks interwoven by 1D Bi₂S₃ nanorods. Interestingly, the heterostructures had almost the same thickness and the bigger length compared to the precursor BiOCl. We proposed the possible formation mechanism of the composites which involved selective ion-exchange reaction, the following Ostwald ripening process and epitaxial growth. And the crystal lattice matching between the a- or b-axis of tetragonal BiOCl (a = b = 3.89 Å) and the a-axis of orthorhombic Bi₂S₃ (a = 3.981 Å) could be responsible for the in-situ topotactic transformation. Due to the formation of hetero-nanostructures, the unique spatial architecture features and the existence of oxygen vacancies, the BiOCl/Bi₂S₃ composites exhibited significantly extended photo-responsive range and improved photocatalytic activity for reduction of Cr^VI under visible-light irradiation. Moreover, the possible mechanism of photocatalysis process was investigated. Our work is expected to inspire further attempts for hierarchical and unconventional hetero-nanostructures with unique spatial architecture, which is very promising for photocatalysis and other applications.

我们在本文中证明了通过容易的两步水热技术实现的均匀的多孔分层板状BiOCl / 2D网络Bi ₂ S ₃异质结构。该合成涉及通过使预先合成的BiOCl不规则八边形纳米板与Na ₂ S ₂ O ₃ ·5H ₂ O在水溶液中反应而进行的阴离子交换过程。实验结果表明，3D板状异质结构由内部BiOCl和外部网络与1D Bi ₂ S ₃交织而成。纳米棒。有趣的是，与前体BiOCl相比，异质结构具有几乎相同的厚度和更大的长度。我们提出了复合材料的可能形成机理，其中涉及选择性离子交换反应，随后的奥斯特瓦尔德熟化过程和外延生长。四方BiOCl的a轴或b轴（a = b = 3.89Å）与正交晶Bi ₂ S ₃的a轴（a = 3.981Å）之间的晶格匹配可能是原位定势的原因转型。由于异质纳米结构的形成，独特的空间结构特征和氧空位的存在，BiOCl / Bi ₂ S ₃复合材料表现出显著延长光响应范围和改善的光催化活性为还原Cr ^VI可见光照射下。此外，研究了光催化过程的可能机理。预期我们的工作将激发进一步尝试以独特的空间结构对分层和非常规的异质纳米结构进行尝试，这对于光催化和其他应用是非常有前途的。