Heterogeneous photocatalysis has been considered as a green and sustainable alternative for water decontamination where the key step is the nanomaterials design to enhance the photocatalytic process. Therefore, in this study the photocatalytic degradation of an emerging contaminant as the tetracycline antibiotic in aqueous solution, was investigated under UV–Vis irradiation by using the WO₃/ZnS photocatalyst. The coupled catalyst was synthesized by hydrothermal method and by varying the WO₃ weight ratio (5, 10 and 20 wt%) with respect to the ZnS. The WO₃/ZnS photoactivity for tetracycline degradation was greatly enhanced when both semiconductors were coupled to form a highly efficient direct Z-scheme. The highest degradation percentage was reached using the catalyst t WO₃(5%)/ZnS, which completely degraded the pollutant within 90 min, and the determination of total organic carbon (TOC) removal indicated a high mineralization degree. Photoelectrochemical studies showed that WO₃(5%)/ZnS exhibited the highest separation of e⁻/h⁺ pairs and the highest transfer efficiency. The improvement of the electron-hole separation in combination with the band alignment analysis, explained the intrinsic mechanism which corresponded to the direct Z-scheme photocatalytic system.

非均相光催化被认为是水净化的绿色和可持续的替代方法，其中关键步骤是纳米材料设计以增强光催化过程。因此，在这项研究中，使用WO ₃ / ZnS光催化剂在UV-Vis照射下研究了水溶液中新出现的污染物四环素抗生素的光催化降解。通过水热法并通过改变相对于ZnS的WO ₃重量比（5、10和20wt％）来合成偶联的催化剂。WO ₃当两个半导体结合形成高效的直接Z方案时，用于四环素降解的/ ZnS光活性大大提高。使用催化剂t WO ₃（5％）/ ZnS达到了最高的降解百分比，该催化剂在90分钟内完全降解了污染物，总有机碳（TOC）去除的测定表明矿化度很高。光电化学的研究表明，WO ₃（5％）/硫化锌表现出最高的分离ë ^- / ħ ⁺对和最高的传输效率。电子-空穴分离的改进与能带取向分析相结合，解释了与直接Z方案光催化体系相对应的内在机理。