Citation: Xiao-Hui ZHU, Zi-Wei GUO, Xiang-Dong LIU, Ren-Hong LI, Tong WEI. Synergistically Catalytic Degradation of Azo Dyes by Ag/MgO[J]. Chinese Journal of Inorganic Chemistry, ;2021, 37(3): 482-490. doi: 10.11862/CJIC.2021.058 shu

Synergistically Catalytic Degradation of Azo Dyes by Ag/MgO

Xiao-Hui ZHU ^{1, 2, 3} ,
Zi-Wei GUO ² ,
Xiang-Dong LIU ^{1, 2} ,
Ren-Hong LI ^{1, 2} ,
Tong WEI ^2,,

1.
College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou 310018, China
2.
School of Materials Science & Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
3.
Anji Goachnieve Enviro Technology Co., Ltd., Huzhou, Zhejiang 313300, China

Corresponding author: Tong WEI, weit@zstu.edu.cn
Received Date: 10 September 2020
Revised Date: 5 January 2021

Figures(12)

Transition metal supported catalysts were prepared by impregnation method with nano MgO as support. Among several supported transition metals, Ag/MgO showed the best performance in degradation of azo dyes and the structure and micro morphology of selected Ag/MgO catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), extended X-ray absorption fine structure spectroscopy (EXAFS) and X-ray absorption near edge structure (XANES). The results show that Ag was evenly dispersed on the surface of MgO in the form of nano clusters, and the formation of bimetallic sites between Ag and Mg and the high electron density of Ag in the catalysts give it high catalytic activity. In formaldehyde solution, azo dye AR1 could be efficiently degraded at room temperature without illuminating or heating treatment. Temperature and formaldehyde concentration are the main factors affecting the degradation efficiency. The degradation efficiency increased with temperature and the optimal formaldehyde concentration was 1 mol·L^-1. Two kinds of free radicals were detected by electron paramagnetic resonance (EPR) trapping experiment to play significant roles in azo dyes degradation process. The reductive hydrogen radical and oxidizing superoxide radical synergistic effect could easily break the chromogenic group (-N=N-) in dye molecules. This "reduction-oxidation" synergistic mechanism improves the reaction efficiency. Moreover, as one of the common pollutants, using aldehyde promoter achieves the "dual treatment of pollutants".
- Ag/MgO,
- nano-catalysis,
- azo dye degradation,
- reactive oxygen species,
- dual treatment of pollutants
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