Liu Zongbin, Yu Xiaojiao, Wei Yuchen, Wang Kai, Zhang Mingkai, Liu Junchao, Chen Lei, Zhang Jian, Niu Jinfen
School of Science, Xi'an University of Technology, Xi'an, 710048, China.
School of Science, Xi'an University of Technology, Xi'an, 710048, China.
Environ Res. 2025 Mar 1;268:120788. doi: 10.1016/j.envres.2025.120788. Epub 2025 Jan 9.
The rapid complexation of photogenerated electrons-holes with copper (Cu) greatly limits the large-scale application of cuprous oxide (CuO) as a photocatalyst. Therefore, using a hydrothermal method, a type Ⅱ heterojunction structure was constructed by modifying CuO with cerium (IV) oxide (CeO). The CeO/CuO heterojunction photocatalyst effectively increased the photogenerated electron density and reduced the surface transfer impedance. The improved separation of photogenerated electron-hole pairs resulted in excellent photocatalytic activity. Consequently, the sulfadiazine (SDZ) degradation rate by CeO/CuO reached 87.5%. Furthermore, after five cycles, the SDZ degradation rate remained as high as 78.5%, demonstrating the good stability of CeO/CuO. The SDZ degradation intermediates were analyzed using high-performance liquid chromatography-tandem mass spectrometry, and possible degradation pathways were proposed. Trapping agent experiments, and energy band structure calculations revealed that CeO/CuO photocatalyzes SDZ degradation via a type Ⅱ heterojunction charge transfer mechanism. Finally, the total organic carbon showed that SDZ eventually decomposed to CO and HO, with complete SDZ degradation. This study provides a reference for the preparation of visible light-responsive photocatalysts.
光生电子-空穴与铜（Cu）的快速复合极大地限制了氧化亚铜（CuO）作为光催化剂的大规模应用。因此，采用水热法，通过用二氧化铈（CeO₂）修饰CuO构建了Ⅱ型异质结结构。CeO₂/CuO异质结光催化剂有效地提高了光生电子密度并降低了表面转移阻抗。光生电子-空穴对分离的改善导致了优异的光催化活性。因此，CeO₂/CuO对磺胺嘧啶（SDZ）的降解率达到了87.5%。此外，经过五个循环后，SDZ降解率仍高达78.5%，表明CeO₂/CuO具有良好的稳定性。使用高效液相色谱-串联质谱法分析了SDZ降解中间体，并提出了可能的降解途径。捕获剂实验和能带结构计算表明，CeO₂/CuO通过Ⅱ型异质结电荷转移机制光催化SDZ降解。最后，总有机碳表明SDZ最终分解为CO₂和H₂O，实现了SDZ的完全降解。本研究为可见光响应型光催化剂的制备提供了参考。
