Electric field-enhanced heterogeneous catalytic ozonation (EHCO) process for sulfadiazine removal: The role of cathodic reduction.

Chemosphere

Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu Province, China. Electronic address:

Published: March 2024

AI Article Synopsis

  • The study explored an electric field-enhanced heterogeneous catalytic ozonation (EHCO) method using a FeOx/PAC catalyst, demonstrating its effectiveness in removing sulfadiazine (SDZ) and total organic carbon (TOC) compared to other processes.
  • Nearly 100% SDZ removal was achieved in just 2 minutes, while TOC removal reached about 85% within 60 minutes, primarily due to increased hydroxyl radical (·OH) generation.
  • The EHCO system showed strong stability and recyclability, maintaining high removal rates across multiple cycles and proving its potential for treating challenging organic pollutants in wastewater.

Article Abstract

In this work, an electric field-enhanced heterogeneous catalytic ozonation (EHCO) was systematically investigated using a prepared FeOx/PAC catalyst. The EHCO process exhibited high sulfadiazine (SDZ) and TOC removal efficiency compared with electrocatalysis (EC) and heterogeneous catalytic ozonation (HCO) process. Almost 100% of SDZ was removed within 2 min, and the TOC removal reached approximately 85% within 60 min. Quenching experiments and EPR analysis suggested that the prominent SDZ and TOC removal performance is supported by the enhanced ·OH generation ability. Further study proved that HO formed by O electrochemical reduction, peroxone reaction and electrochemical reduction of ozone contributed to improving ·OH generation. Furthermore, the EHCO system showed satisfactory stability and recyclability compared to conventional HCO systems, and the SDZ and TOC removal rates were maintained at ≥95% and ≥70% in 16 consecutive recycles, respectively. Meanwhile, XPS analysis and Boehm's titration for the FeOx/PAC catalyst used in HCO and EHCO process confirmed that the external electron supply could restrain the oxidation of surface functional groups of PAC and maintain a balance of the Fe(II)/Fe(III) ratio, which proved the critical role of cathode reduction in catalyst in situ regeneration during long consecutive recycles. In addition, the EHCO system could achieve more than 80% SDZ removal within 2 min in different water matrices. These results confirmed that the EHCO process has a wide application perspective for refractory organics removal in actual wastewater.

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http://dx.doi.org/10.1016/j.chemosphere.2024.141226DOI Listing

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