A novel dual Z-scheme g-C₃N₄/WO₃/AgI photocatalyst was rationally constructed via a two-step method (electrostatic self-assembly plus selective deposition). Firstly, binary g-C₃N₄/WO₃ system was fabricated by electrostatic self-assembly method. Then, Ag ions were selectively adsorbed on the surface of negatively charged WO₃ and reacted with I ions to form AgI nanoparticles. Compared with pure g-C₃N₄, WO₃, AgI and their binary composites, the ternary composites showed significantly enhanced photocatalytic performance for nitenpyram (NTP) degradation under visible light. The enhanced performance can be ascribed to the increased charge transferring/separation efficiency and remaining high reduction/oxidation ability of the photo-generated electrons/holes in the dual Z-scheme system. Furthermore, the possible degradation pathway of NTP was deduced based on the results of high-performance liquid chromatography mass spectrometry (HPLC-MS). This work would broaden insight into the rationally construction of highly efficient Z-scheme composite photocatalysts.

通过两步法（静电自组装加选择性沉积）合理地构建了新型的Z方案gC ₃ N ₄ / WO ₃ / AgI双光催化剂。首先，通过静电自组装法制备了二元gC ₃ N ₄ / WO ₃体系。然后，Ag离子被选择性地吸附在带负电的WO ₃的表面上，并与I离子反应形成AgI纳米颗粒。与纯gC ₃ N ₄相比，WO ₃，AgI及其二元复合物，三元复合物在可见光下显示出对硝苯吡喃（NTP）降解的显着增强的光催化性能。增强的性能可以归因于双Z方案系统中增加的电荷转移/分离效率和光生电子/空穴的高还原/氧化能力。此外，根据高效液相色谱质谱法（HPLC-MS）的结果推论出NTP可能的降解途径。这项工作将拓宽合理构造高效Z方案复合光催化剂的见识。