Catalytic wet air oxidation (CWAO) of fomesafen wastewater was studied using CeO2-TiO2 catalysts. The catalysts were prepared by coprecipitation method and characterized by Brunauer, Emmett, and Teller (BET) surface area, X-ray diffraction, and X-ray photoelectron spectroscopy. In addition, effects of temperature, oxygen partial pressure, and initial pH on the removal efficiency of chemical oxygen demand (COD) were investigated. Moreover, kinetics of CWAO of wastewater of fomesafen production was studied. Results showed that the CeO2-TiO2 catalyst with Ti/Ce of 3:1 had the largest BET surface area. When the reaction temperature was 250°C, oxygen partial pressure was 3 MPa, pH was 5.0, and reaction time was 3 h, the COD removal rate reached 78%. The ratio of biochemical oxygen demand (BOD5) to COD increased from 0.03 to 0.32 after 3 h, which indicated that CWAO can effectively improve the biodegradability of wastewater of fomesafen production. Furthermore, the second-order kinetic model conformed well to experimental data with correlation coefficients greater than 0.90. This is the first study to investigate the CWAO of real wastewater from fomesafen production with CeO2-TiO2 catalyst. This study can add new knowledge to CWAO of the real wastewater of fomesafen production and further enhance the understanding on the function and applicability of CeO2-TiO2 catalyst.
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