A visible-light-driven Bi₂WO₆/CuS p-n heterojunction was fabricated using an easy solvothermal method. The Bi₂WO₆/CuS exhibited high photocatalytic activity in a mixed system containing rhodamine B (RhB), tetracycline hydrochloride (TCH), and Cr (VI) under natural conditions. Approximately 98.8% of the RhB (10 mg/L), 87.6% of the TCH (10 mg/L) and 95.1% of the Cr(VI) (15 mg/L) were simultaneously removed from a mixed solution within 105 min. The removal efficiencies of TCH and Cr(VI) increased by 12.9% and 20.4%, respectively, in the mixed solution, compared with the single solutions. This is mainly ascribed to the simultaneous consumption electrons and holes, which increases the amount of excited electrons/holes and enhances the separation efficiency of photogenerated electrons and holes. Bi₂WO₆/CuS can be applied over a wide pH range (2–6) with strong photocatalytic activity for RhB, TCH and Cr(VI). Coexisiting dissolved organic matter in the solution significantly promoted the removal of TCH (from 74.7% to 87.2%) and Cr(VI) (from 75.7% to 99.9%) because it accelerated the separation of electrons and holes by consuming holes as an electron acceptor. Removal mechanisms of RhB, TCH, and Cr(VI) were proposed, Bi₂WO₆/CuS was formed into a p-n heterojunction to efficiently separate and transfer photoelectrons and holes so as to drive photocatalytic reactions. Specifically, when reducing pollutants (e.g., TCH) and oxidizing pollutants (e.g., Cr(VI)) coexist in wastewater, the p-n heterojunction in Bi₂WO₆/CuS acts as a “bridge” to shorten the electron transport and thus simultaneously increase the removal efficiencies of both types of pollutants.

使用简单的溶剂热法制备了可见光驱动的Bi ₂ WO ₆ / CuS pn异质结。Bi ₂ WO ₆/ CuS在自然条件下，在包含若丹明B（RhB），四环素盐酸盐（TCH）和Cr（VI）的混合体系中表现出较高的光催化活性。在105分钟内从混合溶液中同时去除了大约98.8％的RhB（10 mg / L），87.6％的TCH（10 mg / L）和95.1％的Cr（VI）（15 mg / L）。与单一溶液相比，混合溶液中TCH和Cr（VI）的去除效率分别提高了12.9％和20.4％。这主要归因于同时消耗电子和空穴，这增加了激发的电子/空穴的数量并增强了光生电子和空穴的分离效率。Bi ₂ WO ₆/ CuS可以在很宽的pH范围（2–6）上使用，对RhB，TCH和Cr（VI）具有很强的光催化活性。溶液中共存的溶解有机物显着促进了TCH（从74.7％到87.2％）和Cr（VI）（从75.7％到99.9％）的去除，因为它通过消耗空穴作为电子受体来加速电子和空穴的分离。 。提出了去除RhB，TCH和Cr（VI）的机理，将Bi ₂ WO ₆ / CuS形成为pn异质结，以有效地分离和转移光电子和空穴，从而驱动光催化反应。具体而言，当减少污染物（例如TCH）和氧化性污染物（例如Cr（VI））共存于废水中时，Bi ₂ WO _6中的pn异质结/ CuS充当缩短电子传输的“桥梁”，从而同时提高两种污染物的去除效率。