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- Title
High-efficient catalytic ozonation for degradation of nitrobenzene in water with Ce-doped LaCoO<sub>3</sub> catalyst.
- Authors
Chen, Fengtao; Yan, Haitao; Wang, Junjie; Wang, Heng; Sun, Yongjie; Chen, Xiufang; Lu, Wangyang; Chen, Wenxing
- Abstract
To improve the utilization efficiency of ozonation in wastewater treatment, a series of perovskite-type Ce-doped LaCoO3 catalysts were designed and fabricated through citrate-assisted solgel method. These catalysts were characterized systematically by transmission electron microscope (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). A heterogeneous catalytic ozonation system was constructed to degrade nitrobenzene (NB) in water using Ce-doped LaCoO3 as catalysts under mild conditions. The results showed that La0.9Ce0.1CoO3 catalyst had the highest catalytic activity and satisfactory stability for the catalytic ozonation reaction. The TOC removal efficiency of NB reached as high as 92.5% in 30 min, which was much higher than the sole ozonation (only 34.1%) in a similar condition. Both the results of the radical quenching experiments and electron paramagnetic resonance (EPR) spin trapping experiments demonstrated that ·OH, O2·−, and 1O2 were all generated in the catalytic ozonation system, among which ·OH played a dominant role in the NB mineralization process. Moreover, La0.9Ce0.1CoO3 catalyst could promote the formation of more ·OH by the cycles of ≡Co3+/≡Co2+ and ≡Ce3+/≡Ce4+, which was the main reason of the higher catalytic efficiency in catalytic ozonation system. The catalytic ozonation system with perovskite-type Ce-doped LaCoO3 catalyst has a potential application in the treatment of refractory organic wastewater.
- Subjects
ELECTRON paramagnetic resonance spectroscopy; OZONIZATION; ELECTRON paramagnetic resonance; X-ray photoelectron spectroscopy; NITROBENZENE; TRANSMISSION electron microscopes; SOLAR cell efficiency; SOLAR cells
- Publication
Journal of Materials Science, 2024, Vol 59, Issue 8, p3406
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-024-09437-3