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<p>Sulfonamide antibiotics (SAs) have been detected in groundwater, surface water, and drinking water due to their widespread use. In this study, three typical SAs—sulfamethoxazole (SMX), sulfadimethoxypyrimidine (SM2), and sulfachloropyridazine (SCP) — were selected as target pollutants. The removal efficiency and influencing factors were investigated using different oxidation systems. The combination of H<sub>2</sub>O<sub>2</sub> at 6&#xa0;mg/L and O<sub>3</sub> at 2&#xa0;mg/L proved to be the most effective, while humic acid and inorganic anions negatively impacted the UV/H<sub>2</sub>O<sub>2</sub>/O<sub>3</sub> oxidation system. The degradation mechanism of SMX in different oxidation systems was analyzed based on molar absorption coefficients and bond energies. Additionally, the treatment effects on three types of actual water samples were verified. The removal and oxidation rates of target pollutants by UV-AOPs followed the order UV/H<sub>2</sub>O<sub>2</sub>/O<sub>3</sub> &gt; UV/O<sub>3</sub> &gt; UV/H<sub>2</sub>O<sub>2</sub>. Excitation — Emission — Matrix (EEM) spectra showed that the UV/H<sub>2</sub>O<sub>2</sub>/O<sub>3</sub> system could break down large molecules into smaller ones. The degradation of SMX by the UV/H<sub>2</sub>O<sub>2</sub>/O<sub>3</sub> process followed pseudo-first-order reaction kinetics, with the kinetic equation -ln(C/C<sub>0</sub>) = 0.0349t + 0.2339.</p>

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Study on the Effect of Ultraviolet Advanced Oxidation System on the Degradation Mechanism of Sulfonamide Antibiotics

  • 期刊论文

  • 发表日期：

    2025年7月26日

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  • Linggang Kong,
  • Youmin Sun,
  • Mengmeng Yin

摘要

Sulfonamide antibiotics (SAs) have been detected in groundwater, surface water, and drinking water due to their widespread use. In this study, three typical SAs—sulfamethoxazole (SMX), sulfadimethoxypyrimidine (SM2), and sulfachloropyridazine (SCP) — were selected as target pollutants. The removal efficiency and influencing factors were investigated using different oxidation systems. The combination of H2O2 at 6 mg/L and O3 at 2 mg/L proved to be the most effective, while humic acid and inorganic anions negatively impacted the UV/H2O2/O3 oxidation system. The degradation mechanism of SMX in different oxidation systems was analyzed based on molar absorption coefficients and bond energies. Additionally, the treatment effects on three types of actual water samples were verified. The removal and oxidation rates of target pollutants by UV-AOPs followed the order UV/H2O2/O3 > UV/O3 > UV/H2O2. Excitation — Emission — Matrix (EEM) spectra showed that the UV/H2O2/O3 system could break down large molecules into smaller ones. The degradation of SMX by the UV/H2O2/O3 process followed pseudo-first-order reaction kinetics, with the kinetic equation -ln(C/C0) = 0.0349t + 0.2339.