Flower-Like Ag/ZnO Synthesized by One Pot Hydrothermal Method at Low Temperature with Enhanced Sunlight Photocatalytic Performance

被引：0

作者：

Zhao X. ^{[1
,2
]}

Li B. ^{[1
]}

Wei C. ^{[1
]}

Wang X. ^{[1
]}

Zhou J. ^{[2
]}

Lou X. ^{[1
]}

机构：

[1] School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang

[2] Henan Engineering Laboratory of Environmental Functional Materials and Pollution Control, School of Environment, Henan Normal University, Xinxiang

来源：

Xiyou Jinshu/Chinese Journal of Rare Metals | 2019年 / 43卷 / 06期

关键词：

Ag nanoparticles; Hydrothermal method at low temperature; Nanosheets-assembled flower-like morphology; PH; Sunlight photocatalysis; ZnO;

D O I：

10.13373/j.cnki.cjrm.XY18060005

中图分类号：

学科分类号：

摘要：

Nanosheets-assembled flower-like Ag/ZnO were synthesized by one pot hydrothermal method at low temperature. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscope (XPS), photoluminescence (PL), UV-Vis diffuse reflectance spectroscope (UV-Vis DRS) and transient photocurrent responses, etc. The effects of amounts of Ag deposition and pH of the degradation solution on photocatalytic performance of Ag/ZnO were also investigated. The results showed that the sunlight photocatalytic performance of ZnO could be effectively improved by the deposition of Ag nanoparticles, and Ag/ZnO-4(4% Ag, mass fraction) sample exhibited the best photocatalytic performance. The rate constant of Ag/ZnO for reactive black (GR) degradation was about 5.7 times that of pure ZnO. Furthermore, Ag/ZnO-4 could keep its excellent photocatalytic performance in pH 3~12 for GR degradation, and its morphology and crystal structure had no discernible changes after degradation. This revealed that the resistance ability of ZnO to acid and alkali was improved by the deposition of Ag. Other kinds of organic dyes as well as metronidazole were also degraded well by Ag/ZnO-4. In addition, Ag/ZnO-4 showed good stability in the process of photocatalytic cycling tests. The results of radical trapping tests indicated that both h+ and •O2 - radicals were main oxidative species, while •OH only played assistant roles. The enhanced photocatalytic performance of Ag/ZnO was attributed to the improved sunlight absorption and the effective separation of photogenerated charge carriers, based on the surface plasmon resonance effect and serving as electron reservoirs of Ag nanoparticles, respectively. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.

引用

页码：621 / 630

页数：9

共 28 条

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