Catalytic properties of CuMgAlO catalyst and degradation mechanism in CWPO of methyl orange

[Display omitted] •Cu-loaded MgAl hydrotalcite catalysts were synthesized by impregnation method.•The synthesized catalysts were further used for catalytic wet peroxidation (CWPO) of methyl orange (MO).•The CuMgAlO catalyst showed the highest catalytic activity, stable performance.•The degradation m...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2016-10, Vol.527, p.72-80
Main Authors: Han, Jing, Zeng, Hong-Yan, Xu, Sheng, Chen, Chao-Rong, Liu, Xiao-Jun
Format: Article
Language:English
Subjects:
Bonding strength
Carbon dioxide
Catalysis
Catalysts
Catalytic activity
Chemical synthesis
Copper
CuMgAlO catalyst
CWPO
Degeneration process
Degradation
Dispersion
Dyes
Free radicals
Hydrogen peroxide
Hydroxyl radicals
Leaching
Methyl orange
Oxidation
Thermal analysis
Water treatment
X ray photoelectron spectroscopy
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Summary:[Display omitted] •Cu-loaded MgAl hydrotalcite catalysts were synthesized by impregnation method.•The synthesized catalysts were further used for catalytic wet peroxidation (CWPO) of methyl orange (MO).•The CuMgAlO catalyst showed the highest catalytic activity, stable performance.•The degradation mechanism of MO was determined. Cu-loaded MgAl hydrotalcite catalysts were synthesized by impregnation method and further used for catalytic wet peroxidation (CWPO) of methyl orange (MO) using hydrogen peroxide as oxidant. The synthesized catalysts have been characterized by XRD, FT-IR, SEM/EDS, TG/DTA, XPS, H2-TPR and BET. The characterizations showed that a good dispersion of Cu species inside the MgAl hydrotalcite supports, where Cu2+ and Cu+ species were coexistence, mainly existed as Cu2+↔Cu+ pairs. The CuMgAlO catalyst showed the highest catalytic activity due to the high content of Cu2+↔Cu+ pairs, stable performance during reuse for five cycles with fewer copper leaching. The degradation mechanism of MO was determined by UV-vis, ATR-FTIR and GC–MS. The hydroxyl radicals (HO) induced strong oxidizing effect, where the azo groups (NN−) double bonds would be first attacked by the hydroxyl radical and other free radicals. With the continuous oxidization, these intermediates could be oxidized to the final oxidation products, such as water and carbon dioxide.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2016.08.015