Synthesis, Characterization and Photocatalytic Mechanism of Ag Decorated Sm:ZnO Nanocomposite with High Photocatalytic Activity

被引：0
|
作者：
Ma C. [1 ]
Yu F. [1 ]
Sun Y. [1 ]
Yuan H. [1 ]
Xu M. [1 ]
机构：
[1] Key Laboratory of Information Materials of Sichuan Province, School of Electronic Information, Southwest Minzu University, Chengdu
来源：
Cailiao Daobao/Materials Reports | 2022年 / 36卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Ag/ZnO; Photocatalytic; Polymer network gel method; Sm doping;
D O I：
10.11896/cldb.21010244
中图分类号：
学科分类号：
摘要：
The photocatalytic properties of ZnO based composites are regulated by rare-earth metal doping and noble metal decoration simultaneously. Ag decorated Sm:ZnO nanocomposite photocatalyst can be successfully synthesized by a facile one-step polymeric network gel method in the present work. The X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) are used to study the structure, morphology and surface chemical composition of Ag decorated Sm:ZnO composite. The results show that the composite has good crystallinity and abundant surface defects, and Sm is doped into the lattice of ZnO as Sm3+, while Ag is deposited on the surface of ZnO in the form of metal. The results of UV-visible absorption spectrum (UV-Vis), photoluminescence spectra (PL) and surface photo-voltage spectra (SPV) indicate that Sm doping is able to further improve the utilization of the visible light, and further restrain the recombination of photo-generated carriers, compared with Ag/ZnO. The photocatalytic experiments using methylene blue (MB) as the simulated pollutant under simulated sunlight irradiation show that MB can be completely degraded by Ag decorated Sm:ZnO composite after irradiation for 10 min, and the photocatalytic efficiency is 2.44 times higher than that of Ag/ZnO. What's more, the stability of photocatalytic efficiency is repeatedly verified by five cyclic degradation experiments. The significantly enhanced photocatalytic properties of Ag decorated Sm:ZnO composite are due to the synergistic effect of Sm doping and Ag decoration. On the one hand, with the introduction of Sm and Ag, the sample exhibits better crystal quality and abundant surface defects. On the other hand, the impurity energy levels introduced by Sm doping and the surface plasma resonance effect generated by Ag decoration not only improve the absorption of visible light, but also facilitate the migration of photogenerated electrons, thus realizing more efficient photogenerated carrier separation. © 2022, Materials Review Magazine. All right reserved.
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