The photocatalytic degradation under mild conditions is considered as a promising solution for water pollution induced by the abuse of antibiotics. Herein, a new nanocomposite constructed (3D/2D) BiVO₄@Polypyrrole/g-C₃N₄ ternary composites with Z-scheme was successfully proposed. The result of photocatalytic performance evaluation indicated that BiVO₄@Polypyrrole/g-C₃N₄ (5 wt%) exhibited outstanding photocatalytic activity compared with g-C₃N₄ and BiVO₄, even under different water quality and ion doping conditions, and the degradation efficiency of tetracycline (TC) can reach 90% within 120 min. The cycle test proved that the prepared composite catalyst has good stability and reusability. DRS, PL and other characterization results illustrated that the improvement of catalytic performance was attributed to electron transfer channel between (3D) BiVO₄@PPy and (2D) g-C₃N₄, which can effectively separate photon-generated carriers. The possible mechanism based on Z-scheme heterojunction was proposed considering the free radical capture, Mott-Schottky, LC-MS and ESR. The present work serves as a principal route to design and extend striking step-scheme g-C₃N_4-based nanocomposites with promising environmental purification and solar fuel generation usage.

在温和条件下的光催化降解被认为是解决因滥用抗生素而引起的水污染的有前途的解决方案。在此，成功地提出了一种新型的Z复合纳米复合材料（3D / 2D）BiVO ₄ @ Polypyrrole / gC ₃ N ₄三元复合材料。光催化性能评价结果表明，与gC ₃ N ₄和BiVO ₄相比，BiVO ₄ @ Polypyrrole / gC ₃ N ₄（5 wt％）表现出优异的光催化活性。即使在不同的水质和离子掺杂条件下，四环素（TC）的降解效率在120分钟内也可以达到90％。循环试验证明所制备的复合催化剂具有良好的稳定性和可重复使用性。DRS，PL等表征结果表明，催化性能的提高归因于（3D）BiVO ₄ @PPy与（2D）gC ₃ N ₄之间的电子转移通道，可以有效分离光子产生的载流子。考虑到自由基捕获，Mott-Schottky，LC-MS和ESR，提出了基于Z型异质结的可能机理。本工作是设计和扩展打击步骤gC ₃ N _4-的主要途径纳米复合材料，有望用于环境净化和太阳能燃料的使用。