Template free synthesis of ZnO/Ag2O nanocomposites as a highly efficient visible active photocatalyst for detoxification of methyl orange

被引:127
作者
Kadam, Abhijit [1 ]
Dhabbe, Rohant [1 ]
Gophane, Anna [2 ]
Sathe, Tukaram [2 ]
Garadkar, Kalyanrao [1 ]
机构
[1] Shivaji Univ, Dept Chem, Nanomat Res Lab, Kolhapur 416004, Maharashtra, India
[2] Shivaji Univ, Dept Zool, Kolhapur 416004, Maharashtra, India
关键词
Nanocomposites; Optical properties; Visible photocatalysis; Comet assay; HETEROJUNCTION PHOTOCATALYSTS; ENHANCED ULTRAVIOLET; ZNO NANORODS; IN-VITRO; DEGRADATION; HETEROSTRUCTURES; NANOPARTICLES; OXIDE; AG2O; PHOTODEGRADATION;
D O I
10.1016/j.jphotobiol.2015.11.007
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A simple and effective route for the synthesis of ZnO/Ag2O nanocomposites with different weight ratios (4:1 to 4:4) have been successfully obtained by combination of thermal decomposition and precipitation technique. The structure, composition, morphology and optical properties of the as-prepared ZnO/Ag2O composites were characterized by XRD, FT-IR, EDS, SEM, TEM, UV-Vis DRS and PI, respectively. The photocatalytic performance of the photocatalysts was evaluated towards the degradation of a methyl orange (MO) under UV and visible light. More specifically, the results showed that the photocatalytic activity with highest rate constant of MO degradation over ZnO/Ag2O (4:2) nanocomposites is more than 22 and 4 times than those of pure ZnO and Ag2O under visible light irradiation, respectively. An improved photocatalytic activity was attributed to the formation of heterostructure between Ag2O and ZnO, the strong visible light absorption and more separation efficiency of photoinduced electron-hole pairs. Moreover, the ZnO/Ag2O (4:2) nanocomposite showed excellent stability towards the photodegradation of MO under visible light. Finally, a possible mechanism for enhanced charge separation and photodegrdation is proposed. Genotoxicity of MO before and after photodegradation was also evaluated by simple comet assay technique. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:24 / 33
页数:10
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