As a representative artificial photosynthetic system, direct Z-scheme WO₃/CdS is a promising photocatalyst system for water purification. However, this system is still limited due to low electron transfer efficiency and serious photocorrosion. Here, we designed and precisely fabricated a novel all-solid-state Z-scheme WO₃/CDots/CdS system. The CDots, as a nonmetallic electron mediator, could promote interfacial charge carrier separation and eliminate photocorrosion with enhanced photocatalytic activity. The phase, morphologies, microstructures, and optical and electrical properties of as-obtained Z-scheme WO₃/CDots/CdS heterojunctions were investigated in detail. The photocatalytic performance of as-prepared catalysts was evaluated by the decomposition of 4-chlorophenol (4-CP), rhodamine B (RhB), and tetracycline hydrochloride (TCH) and the reduction of aqueous Cr(VI) in visible light. The optimized Z-scheme WO₃/CDots/CdS-2 photocatalyst exhibited the highest photocatalytic activity for degrading and mineralizing 4-CP (∼70.0% and 48.3% in 7 h, respectively), both of which exceeded the rates observed in WO₃/CdS samples under the same conditions by ∼2 times. In addition, the WO₃/CDots/CdS-2 showed excellent stability and reusability with negligible change at ∼2.2% difference for 4-CP degradation in eight cycles. The release percentage of SO₄²⁻ (transformed from S²⁻) and Cd²⁺ was only ∼0.77% and 0.79%, respectively, when compared with the initial concentration, which was far less than for the WO₃/CdS system (∼5.64% and 5.70%). The results indicated that a thorough and complete Z-scheme charge carrier transfer route was achieved. Toxicity assessment authenticated good biocompatibility and low cytotoxicity of WO₃/CDots/CdS. This study showed that the Z-scheme WO₃/CDots/CdS was a promising photocatalyst for water purification.

作为代表性的人工光合作用系统，直接Z方案WO ₃ / CdS是用于水净化的有前途的光催化剂系统。但是，由于电子转移效率低和严重的光腐蚀，该系统仍然受到限制。在这里，我们设计并精确地制造了新颖的全固态Z方案WO ₃ / CDots / CdS系统。CDots作为一种非金属电子介体，可以促进界面电荷载流子的分离，并通过增强光催化活性来消除光腐蚀。所获得的Z方案WO ₃的相，形态，微观结构以及光学和电学性质/ CDots / CdS异质结进行了详细研究。通过在可见光下4-氯苯酚（4-CP），若丹明B（RhB）和四环素盐酸盐（TCH）的分解以及Cr（VI）水溶液的还原来评估所制备催化剂的光催化性能。优化的Z方案WO ₃ / CDots / CdS-2光催化剂对4-CP的降解和矿化表现出最高的光催化活性（分别在7小时内约为70.0％和48.3％），两者均超过了WO _3中观察到的速率。/ CdS样品在相同条件下约2倍。另外，WO ₃ / CDots / CdS-2表现出优异的稳定性和可重复使用性，对于八个循环中的4-CP降解，变化相差约2.2％，变化可忽略不计。SO ₄的释放百分比与初始浓度相比，^2-（由S ^2-转化）和Cd ²⁺分别仅为〜0.77％和0.79％，远小于WO ₃ / CdS系统的浓度（〜5.64％和5.70％ ）。结果表明，Z方案电荷载流子传递途径彻底，完整。毒性评估证实了WO ₃ / CDots / CdS的良好生物相容性和低细胞毒性。这项研究表明Z方案WO ₃ / CDots / CdS是一种有前途的水净化光催化剂。