Issue 19, 2024

CeO2-modified monolithic ceramic foams for efficient catalytic ozonation of refractory organic pollutants in a continuous-flow reactor

Abstract

Heterogeneous catalytic ozonation is valid for the advanced oxidation of organic pollutants in wastewater, but it is usually used in the packing bed with granular supports/catalysts with considerable fluid resistance and unsatisfactory ozone utilization efficiency in practical wastewater treatment. Herein, CeO2-modified monolithic ceramic foams (CeO2/AlCF) were developed for the efficient catalytic ozonation of refractory organic pollutants in a continuous-flow mode. The TOC removal efficiency of phenol by CeO2/AlCF was about 80% with a hydraulic retention time (HRT) of 12 min. The system also showed high TOC removal efficiencies (68%–81%) for other organic pollutants including oxalic acid, 2,4-dimethylphenol, and p-nitrophenol. The chemical oxygen demand (COD) of the biological treatment effluent of petrochemical wastewater decreased from 136 mg L−1 to 45.2 mg L−1 with a COD removal efficiency of nearly 67%. The ozone utilization efficiencies of CeO2/AlCF ranged from 53% to 73%, which were much higher than those of granular catalysts (42–68%). The quenching experiments and EPR analysis revealed that the process followed a hydroxyl radical mechanism. H2 temperature-programmed reduction (H2-TPR) analysis showed that the transition of Ce4+ to Ce3+ in CeO2/AlCF was much easier than that in CeO2 and hence had a better catalytic capability.

Graphical abstract: CeO2-modified monolithic ceramic foams for efficient catalytic ozonation of refractory organic pollutants in a continuous-flow reactor

Supplementary files

Article information

Article type
Paper
Submitted
05 Jun 2024
Accepted
01 Aug 2024
First published
01 Aug 2024

Catal. Sci. Technol., 2024,14, 5653-5661

CeO2-modified monolithic ceramic foams for efficient catalytic ozonation of refractory organic pollutants in a continuous-flow reactor

Y. Zhao, W. Ding, X. Chen and S. Chen, Catal. Sci. Technol., 2024, 14, 5653 DOI: 10.1039/D4CY00710G

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