Li Liang, Wu Chao-Qun, Zhang Zhi-Xuan, Zhang Nan, Huang Ting, Wang Yong
School of Chemistry, Key Laboratory of Advanced Technologies of Materials (Ministry of Education), Southwest Jiaotong University, Chengdu 610031, China.
Langmuir. 2025 Jul 15;41(27):18184-18199. doi: 10.1021/acs.langmuir.5c02149. Epub 2025 Jul 1.
The rapid development of modern industry has exacerbated water pollution, posing significant threats to environmental sustainability and human health. Semiconductor heterostructures have emerged as a promising strategy to enhance the photochemical properties and catalytic activity of heterogeneous catalysts, offering a viable solution to water pollution challenges. In this study, a series of CeO/CdSe catalysts was successfully synthesized via chemical deposition. The results demonstrate that CdSe nanoparticles could effectively modulate the band gap, enhance visible light absorption ability, and improve the photochemical performance of CeO/CdSe composites. The catalytic activity and practical application prospects of the as-synthesized samples were evaluated by reducing hexavalent chromium (Cr(VI)) and decomposing tetracycline hydrochloride (TCH). CeO/CdSe composites exhibited significantly higher photocatalytic activities compared to pure CdSe and CeO. Notably, CeO/0.6CdSe demonstrated the highest photocatalytic activity, achieving 93.6% removal of Cr(VI), which was 4.39 and 1.77 times as high as those of pure CeO and CdSe in sequence. Furthermore, CeO/0.6CdSe achieved a remarkable TCH removal rate of 97.0%. The enhanced photocatalytic performance of CeO/0.6CdSe is attributed to the formation of heterojunction structures between CdSe and CeO, which facilitates efficient charge separation and transfer. Cyclic experiments confirmed the excellent anti-interference ability and sustainability of CeO/0.6CdSe. Reduction mechanisms of Cr(VI) and degradation mechanisms of TCH were thoroughly investigated, with DFT mechanistic analysis providing further insights into the superior catalytic activity of CeO/0.6CdSe. This work highlights the potential of CeO/0.6CdSe as a highly efficient photocatalyst with broad applications in wastewater treatment.
现代工业的快速发展加剧了水污染，对环境可持续性和人类健康构成了重大威胁。半导体异质结构已成为增强非均相催化剂光化学性质和催化活性的一种有前景的策略，为水污染挑战提供了可行的解决方案。在本研究中，通过化学沉积成功合成了一系列CeO/CdSe催化剂。结果表明，CdSe纳米颗粒可以有效调节带隙，增强可见光吸收能力，并改善CeO/CdSe复合材料的光化学性能。通过还原六价铬（Cr(VI)）和分解盐酸四环素（TCH）来评估所合成样品的催化活性和实际应用前景。与纯CdSe和CeO相比，CeO/CdSe复合材料表现出显著更高的光催化活性。值得注意的是，CeO/0.6CdSe表现出最高的光催化活性，Cr(VI)去除率达到93.6%，分别是纯CeO和CdSe的4.39倍和1.77倍。此外，CeO/0.6CdSe对TCH的去除率达到了97.0%。CeO/0.6CdSe光催化性能的增强归因于CdSe和CeO之间形成的异质结结构，这有利于电荷的有效分离和转移。循环实验证实了CeO/0.6CdSe具有出色的抗干扰能力和稳定性。深入研究了Cr(VI)的还原机理和TCH的降解机理，密度泛函理论（DFT）机理分析进一步揭示了CeO/0.6CdSe优异的催化活性。这项工作突出了CeO/0.6CdSe作为一种高效光催化剂在废水处理中广泛应用的潜力。
