Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Florida 1709, Johannesburg, South Africa.
Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Florida 1709, Johannesburg, South Africa.
J Colloid Interface Sci. 2021 Dec;603:666-684. doi: 10.1016/j.jcis.2021.06.146. Epub 2021 Jun 29.
Herein, a dual Z-scheme heterojunction photocatalyst consisting of CoO, CuBiO, and SmVO for carbamazepine (CBZ) degradation was synthesised and characterised by XRD, FTIR, UV-Vis DRS, XPS, FE-SEM, and TEM. The reduction in electron-hole recombination was evaluated by PL, LSV, and EIS analysis. The heterojunction, CoO/CuBiO/SmVO (CCBSV) showed enhanced photocatalytic activity of 76.1% ± 3.81 CBZ degradation under visible light irradiation, ascribed to the improved interfacial contact, visible light capturing ability, and enhanced electron-hole separation and transportation through the formation of Z-scheme heterojunction. The formation of dual Z-scheme was confirmed by active radical experiments and XPS analysis that helped to prose the mechanism of degradation. The catalyst showed sustained stability after 4 cycles of reuse. Ultra-high-performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UHPLC-QTOF-MS) was employed to identify the degradation by-products of CBZ, and a possible mechanistic degradation pathway was proposed. This study provided an insight into the development of efficient dual Z-scheme heterojunction photocatalyst for remediation of CBZ which can be extended to other organic pollutants.
本文合成并通过 XRD、FTIR、UV-Vis DRS、XPS、FE-SEM 和 TEM 对由 CoO、CuBiO 和 SmVO 组成的双 Z 型异质结光催化剂用于卡马西平 (CBZ) 降解进行了表征。通过 PL、LSV 和 EIS 分析评估了电子-空穴复合的减少。异质结 CoO/CuBiO/SmVO（CCBSV）在可见光照射下表现出增强的光催化活性，可将 CBZ 降解率提高到 76.1%±3.81%，这归因于通过形成 Z 型异质结改善了界面接触、可见光捕获能力以及增强的电子-空穴分离和传输。通过活性自由基实验和 XPS 分析证实了双 Z 型结构的形成，这有助于阐述降解机制。催化剂在重复使用 4 次后表现出良好的稳定性。采用超高效液相色谱-四极杆飞行时间质谱 (UHPLC-QTOF-MS) 鉴定 CBZ 的降解产物，并提出了可能的降解途径。该研究为开发用于修复 CBZ 的高效双 Z 型异质结光催化剂提供了新的思路，并可推广应用于其他有机污染物。
