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The catalytic degradation of nitrobenzene by the Cu–Co–Fe-LDH through activated oxygen under ambient conditions

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Abstract

Efficient and low-cost catalysts for catalytic wet air oxidation (CWAO) under ambient conditions are of great significance for the degradation of hydrophobic organic contaminants. In this study, four LDH catalysts were prepared and their catalytic performance was studied by the degradation of nitrobenzene. The CuCoFe-LDH shows the best catalytic activity with an NB removal efficiency of 41.2%. The CuCoFe-LDH exhibited a typical layer structure, with a specific surface area of 167.32 m2 g−1, and Cu2+, Co2+ and Fe3+ were evenly dispersed on the crystal. The NB removal efficiency was increased by 12.5% through adding formic acid. After five recycling processes, the NB removal efficiency was 18.9% because 3.8 mg g−1 of Co was leached out of the LDH. In the CWAO process, H2O2, ˙OH, ˙O2 and 1O2 were successfully formed through activated oxygen by the CuCoFe-LDH catalyst under ambient conditions. This work further broadens the application scope of layered double hydroxides (LDHs) in the degradation of organic pollutants by CWAO under ambient conditions.

Graphical abstract: The catalytic degradation of nitrobenzene by the Cu–Co–Fe-LDH through activated oxygen under ambient conditions

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Article information


Submitted
27 Sep 2019
Accepted
27 Jan 2020
First published
27 Jan 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

The catalytic degradation of nitrobenzene by the Cu–Co–Fe-LDH through activated oxygen under ambient conditions

S. Wang, J. Zhu, S. Zhang, X. Zhang, F. Ge and Y. Xu, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT03794B

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