用于水净化的稳定高性能海胆状CeO/ZnO@Au分级异质结光催化剂的制备
Fabrication of stable high-performance urchin-like CeO/ZnO@Au hierarchical heterojunction photocatalyst for water remediation.
作者信息
Huang Linsen, Bao Deyu, Jiang Xiaoqing, Li Junhua, Zhang Liangxing, Sun Xiaosong
机构信息
College of Materials Science and Engineering, Sichuan University, No. 29, Wang Jiang Road, Chengdu 610064, PR China.
College of Materials Science and Engineering, Sichuan University, No. 29, Wang Jiang Road, Chengdu 610064, PR China.
出版信息
J Colloid Interface Sci. 2021 Apr 15;588:713-724. doi: 10.1016/j.jcis.2020.11.099. Epub 2020 Dec 1.
In this paper, the urchin-like CeO/ZnO@Au photocatalyst was rationally designed and prepared through hydrothermal method, chemical precipitation and photo reduction deposition. The optimal photocatalyst (CZA8) degraded Rhodamine B (RhB), 4-nitrophenol (4-NP) and Naproxen (NPX) about 100% within 20 min, 91.4% within 60 min and 88.9% within 30 min under Xe lamp illumination, respectively. Besides, the CZA8 possesses outstanding photo corrosion resistance capacity which has been verified with the cycle degradation experiments. The photocatalyst displays excellent light response and efficient separation of photo-induced carriers due to the fabrication of type-II heterojunction, the presence of surface plasmon resonance (SPR) effect and as well as the oxygen vacancy. The oxygen vacancy was systematically characterized by XPS, PL and Raman. Moreover, the photocatalytic degradation pathways are proposed based on the LC-MS results. Finally, a novel photocatalytic mechanism for photocatalytic oxidation of RhB, 4-NP and NPX is discussed and schematically illuminated.
在本文中，通过水热法、化学沉淀法和光还原沉积法合理设计并制备了海胆状CeO/ZnO@Au光催化剂。最佳光催化剂（CZA8）在氙灯照射下，分别在20分钟内将罗丹明B（RhB）、4-硝基苯酚（4-NP）和萘普生（NPX）降解约100%，在60分钟内降解91.4%，在30分钟内降解88.9%。此外，CZA8具有出色的抗光腐蚀能力，这已通过循环降解实验得到验证。由于II型异质结的构建、表面等离子体共振（SPR）效应的存在以及氧空位的存在，该光催化剂表现出优异的光响应和光生载流子的有效分离。通过XPS、PL和拉曼光谱对氧空位进行了系统表征。此外，基于LC-MS结果提出了光催化降解途径。最后，讨论并示意性地阐明了一种用于RhB、4-NP和NPX光催化氧化的新型光催化机理。
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