A novel visible-light-responsive Black-TiO₂/CoTiO₃ (denoted as B-TiO₂/CTO) Z-Scheme heterojunction photocatalyst was successfully synthesized by a calcination method. The obtained samples were attentively characterized by various techniques and measurement procedures to assess the morphological, optical, and structural properties. The B-TiO₂/CTO nanocomposite exhibited the photocatalytic efficiency 99% after 20, 30, and 60 min for photodegradation of Rhodamine B (RhB), Methylene Blue (MB), and Methyl Orange (MO), respectively. Furthermore, degradation efficiency was 82.4% for tetracycline (TC) as a pharmaceutical contaminant under B-TiO₂/CTO nanocomposite. In all photocatalytic experiments, the nanocomposite activity was higher than that of B-TiO₂ and CTO, which improved its performance due to more generation, separation, and transport of charge carriers, which was confirmed by PL, EIS, and photocurrent techniques. Furthermore, the specific surface area of the nanocomposite was slightly increased after the combining of B-TiO₂ and CTO, resulting in an increase of active sites and photogenerated electron-holes. Trapping experiments revealed that ^⦁OH, ^⦁O₂⁻, and h⁺ species play an important role in the degradation process. According to the results obtained in this work, the Z-Scheme mechanism was proposed that was more in line with the actual conditions of the photocatalytic process. Finally, a series of seven sequential cycles for dyes degradation was performed using B-TiO₂/CTO nanocomposite without significantly reducing performance.

通过煅烧方法成功合成了新型的可见光响应性Black-TiO ₂ / CoTiO ₃（称为B-TiO ₂ / CTO）Z-Scheme异质结光催化剂。通过各种技术和测量程序对获得的样品进行了仔细的表征，以评估其形态，光学和结构特性。在20、30和60分钟后，B-TiO ₂ / CTO纳米复合材料分别对罗丹明B（RhB），亚甲基蓝（MB）和甲基橙（MO）的光降解表现出99％的光催化效率。此外，在B-TiO ₂下，作为药物污染物的四环素（TC）的降解效率为82.4％/ CTO纳米复合材料。在所有光催化实验中，纳米复合材料的活性均高于B-TiO ₂和CTO，这是由于PL，EIS和光电流技术证实了电荷载流子的更多生成，分离和迁移，从而提高了其性能。此外，在B-TiO ₂和CTO结合后，纳米复合材料的比表面积略有增加，导致活性位点和光生电子空穴的增加。捕集实验表明^⦁ OH，^⦁ ö ₂ ^- ，和^ h ⁺物种在降解过程中起重要作用。根据这项工作获得的结果，提出了与光催化过程的实际条件更相符的Z方案机理。最后，在不显着降低性能的情况下，使用B-TiO ₂ / CTO纳米复合材料进行了七个连续的染料降解循环。