Construction of Z-Scheme Tris(4-aminophenyl)amine-Based Polyimide-WO3 Heterojunction for Photo-Fenton Degradation of Tetracycline Hydrochloride

This study successfully constructed a direct Z-scheme TP-WO3 heterojunction photocatalytic system via an in situ compositing strategy for the photoassisted Fenton degradation of tetracycline hydrochloride in aqueous environments. The composite formed an intimate interfacial contact between TP and WO3, effectively facilitating the separation and migration of photogenerated charge carriers. Experiments demonstrated that TP-WO3(0.7) achieved a degradation efficiency of 92.34% for 10 ppm tetracycline within 75 min under visible light irradiation with H2O2 assistance, with a reaction rate constant (2.731 × 10–2 min–1) significantly higher than those of the individual components. Radical trapping experiments and electron paramagnetic resonance (EPR) analysis confirmed that h+, •OH, and •O2– were the main active species. This study provides a feasible design strategy and experimental basis for developing efficient and stable organic–inorganic Z-scheme heterojunction photocatalytic materials.