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<p>At present, the most commonly used advanced oxidation technology for drinking water treatment has the disadvantage of low utilization rate of oxidant. After research and comparison, the UV/H<sub>2</sub>O<sub>2</sub>/Fe(III) combined process selected in this study can effectively degrade sulfamethoxazole (SMX) in water and improve the utilization rate of hydrogen peroxide. The results showed that the removal rate of SMX by UV/H<sub>2</sub>O<sub>2</sub>/Fe(III) process was 96.7%, and the utilization rate of H<sub>2</sub>O<sub>2</sub> was increased by 25%; the UV/H<sub>2</sub>O<sub>2</sub>/Fe(III) combined process also had a good effect on the degradation of fluorescent components and other organic matter in water; the presence of nitrite ion and humic acid significantly reduced the degradation efficiency of SMX, under the condition of nitrite ion concentration of 5&#xa0;mg/L or humic acid concentration of 10&#xa0;mg/L, the removal rate of SMX by UV/H<sub>2</sub>O<sub>2</sub>/Fe(III) combined process decreased by 10.68% or 11.92%, respectively. In terms of mechanism research, the reactivity of SMX molecules was theoretically calculated by density functional theory (DFT), and the atoms with higher contribution rate were calculated, and the degradation products and four degradation pathways of SMX were identified and analyzed by mass spectrometry. Finally, the potential ecological toxicity of SMX and its degradation products was predicted by ECOSAR software and luminescent bacteria experiments; it was found that the toxicity of SMX and its degradation products was relatively high at 15&#xa0;min.</p>

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Study on the effect and mechanism of Fenton-like reaction based on UV/H2O2 to degrade sulfamethoxazole in water

  • 期刊论文

  • 发表日期：

    2026年1月28日

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  • Baochang Zhou,
  • Guifang Li,
  • Zhangbin Pan,
  • Bin Dong,
  • Zhenqi Du,
  • Baiqiang Zhang,
  • Mei Li,
  • Yonglei Wang,
  • Ruibao Jia

摘要

At present, the most commonly used advanced oxidation technology for drinking water treatment has the disadvantage of low utilization rate of oxidant. After research and comparison, the UV/H2O2/Fe(III) combined process selected in this study can effectively degrade sulfamethoxazole (SMX) in water and improve the utilization rate of hydrogen peroxide. The results showed that the removal rate of SMX by UV/H2O2/Fe(III) process was 96.7%, and the utilization rate of H2O2 was increased by 25%; the UV/H2O2/Fe(III) combined process also had a good effect on the degradation of fluorescent components and other organic matter in water; the presence of nitrite ion and humic acid significantly reduced the degradation efficiency of SMX, under the condition of nitrite ion concentration of 5 mg/L or humic acid concentration of 10 mg/L, the removal rate of SMX by UV/H2O2/Fe(III) combined process decreased by 10.68% or 11.92%, respectively. In terms of mechanism research, the reactivity of SMX molecules was theoretically calculated by density functional theory (DFT), and the atoms with higher contribution rate were calculated, and the degradation products and four degradation pathways of SMX were identified and analyzed by mass spectrometry. Finally, the potential ecological toxicity of SMX and its degradation products was predicted by ECOSAR software and luminescent bacteria experiments; it was found that the toxicity of SMX and its degradation products was relatively high at 15 min.