Developing sheet-on-sheet (2D/2D) heterostructure with built-in electric field (BIEF) is effective in boosting the performance of photocatalysts for emerging contaminants degradation. Herein, the 2D/2D microtopography and (−)TiO₂/(+)Bi₂MoO₆ BIEF were precisely integrated into hierarchical nanosheets, which can provide the basis and driving force for charge transfer both in in-plane and interface of heterojunction. The prepared photocatalyst (TiO₂/Bi₂MoO₆) showed high-efficiency and stable performance for photocatalytic amoxicillin (AMX) degradation, which was 18.2 and 5.7 times higher than TiO₂ and Bi₂MoO₆, respectively. More importantly, TiO₂/Bi₂MoO₆ showed more efficient photocatalytic activity and photogenerated charge separation than TiO₂@Bi₂MoO₆ (different morphology). Besides, four possible pathways of AMX degradation were proposed depending on Gaussian calculations and intermediates analysis by GC-MS and HPLC-TOFMS. This work sheds light on the design and construction of unique 2D/2D heterostructure photocatalysts for AMX degradation.

开发具有内置电场 (BIEF) 的片对片 (2D/2D) 异质结构可有效提高光催化剂对新兴污染物降解的性能。在此，2D/2D微形貌和(-)TiO ₂ /(+)Bi ₂ MoO ₆ BIEF被精确地集成到分级纳米片中，这可以为异质结面内和界面内的电荷转移提供基础和驱动力。制备的光催化剂（TiO ₂ /Bi ₂ MoO ₆）对光催化降解阿莫西林（AMX）表现出高效稳定的性能，分别是TiO ₂和Bi ₂ MoO _{6 的}18.2倍和5.7倍， 分别。更重要的是，TiO ₂ /Bi ₂ MoO ₆表现出比TiO ₂ @Bi ₂ MoO ₆（不同形态）更有效的光催化活性和光生电荷分离。此外，根据高斯计算和 GC-MS 和 HPLC-TOFMS 的中间体分析，提出了四种可能的 AMX 降解途径。这项工作阐明了用于 AMX 降解的独特 2D/2D 异质结构光催化剂的设计和构建。