Electro-catalytic activity of CeO<sub><i>x</i></sub> modified graphite felt for carbamazepine degradation via E-peroxone process

doi:10.1007/s11783-021-1410-x

Front. Environ. Sci. Eng.

2021, Vol. 15

Issue (6) : 122 https://doi.org/10.1007/s11783-021-1410-x

RESEARCH ARTICLE

Electro-catalytic activity of CeO_x modified graphite felt for carbamazepine degradation via E-peroxone process

Xinyu Wang¹, Ye Jin¹, Weirui Chen^1,^2,^3,⁴(

), Ruini Zou¹, Jinxin Xie¹, Yiming Tang¹, Xukai Li^1,^2,^3,⁴, Laisheng Li^1,^2,^3,⁴(

)

¹. School of Environment, South China Normal University, Guangzhou 510006, China
². Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, Guangzhou 510006, China
³. Guangdong Provincial Engineering Technology Research Center for Drinking Water Safety, Guangzhou 510006, China
⁴. Guangdong Provincial Key Laboratory of Functional Materials for Environmental Protection, Guangzhou 510006, China

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Abstract

•CeO_x/GF-EP process had the better degradation efficiency than GF-EP process.

•CeO_x/GF-EP process had the flexible application in the pH range from 5.0 to 9.0.

•CeO_x could enhance surface hydrophilicity and reduce the charge-transfer resistance.

•The interfacial electron transfer process was revealed.

E-peroxone (EP) was one of the most attractive AOPs for removing refractory organic compounds from water, but the high energy consumption for in situ generating H₂O₂ and its low reaction efficiency for activating O₃ under acidic conditions made the obstacles for its practical application. In this study, cerium oxide was loaded on the surface of graphite felt (GF) by the hydrothermal method to construct the efficient electrode (CeO_x/GF) for mineralizing carbamazepine (CBZ) via EP process. CeO_x/GF was an efficient cathode, which led to 69.4% TOC removal in CeO_x/GF-EP process with current intensity of 10 mA in 60 min. Moreover, CeO_x/GF had the flexible application in the pH range from 5.0 to 9.0, TOC removal had no obvious decline with decrease of pH. Comparative characterizations showed that CeO_x could enhance surface hydrophilicity and reduce the charge-transfer resistance of GF. About 5.4 mg/L H₂O₂ generated in CeO_x/GF-EP process, which was 2.1 times as that in GF-EP process. The greater ozone utility was also found in CeO_x/GF-EP process. More O₃ was activated into hydroxyl radicals, which accounted for the mineralization of CBZ. An interfacial electron transfer process was revealed, which involved the function of oxygen vacancies and Ce³⁺/Ce⁴⁺ redox cycle. CeO_x/GF had the good recycling property in fifth times’ use.

Keywords E-peroxone CeO_x Graphite felt Carbamazepine Mineralization

Corresponding Author(s): Weirui Chen,Laisheng Li

Issue Date: 16 March 2021

Cite this article:

Xinyu Wang,Ye Jin,Weirui Chen, et al. Electro-catalytic activity of CeO_x modified graphite felt for carbamazepine degradation via E-peroxone process[J]. Front. Environ. Sci. Eng., 2021, 15(6): 122.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-021-1410-x
https://academic.hep.com.cn/fese/EN/Y2021/V15/I6/122

Fig.1 XRD pattern of CeO_x, GF and CeO_x/GF.

Fig.2 Morphology and wettability: SEM and water contact angle of GF (a–b), SEM and water contact angle of CeO_x/GF (c–d), EDS of CeO_x/GF.

Fig.3 XPS (a) and EPR (b) of CeO_x/GF.

Fig.4 LSV(a) and EIS (b) pattern of GF and CeO_x/GF.

Fig.5 Catalytic behavior of CeO_x/GF (a) CBZ mineralization; (b) pseudo first order kinetics fitting; (c) influence of current intensity; (d) influence of Ce(NO₃)₃ concentration; (e) Reusability; Reaction condition: solution volume: 1.0 L; initial pH= 5.0; ozone output: 50 mg/h; flow rate: 0.5 L/min; CBZ concentration: 10 mg/L; reaction temperature: 298 K.

Fig.6 Influence of pH on TOC removal. Reaction condition: solution volume: 1.0 L; ozone output: 50 mg/h; flow rate: 0.5 L/min; CBZ concentration: 10 mg/L; reaction temperature: 298 K.

Fig.7 H₂O₂ generation (a) and O₃ consumption (b). Reaction condition: solution volume: 1.0 L; initial pH= 5.0; ozone output: 50 mg/h; flow rate: 0.5 L/min; CBZ concentration: 10 mg/L; reaction temperature: 298 K.

Fig.8 Influence of HSO₃^- on TOC removal. Reaction condition: solution volume: 1.0 L; initial pH= 5.0; ozone output: 50 mg/h; flow rate: 0.5 L/min; CBZ concentration: 10 mg/L; reaction temperature: 298 K.

Fig.9 LSV(a) and EIS (b) of GF and CeO_x/GF in different processes.

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