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<p>A nano-sized Al<sub>2</sub>O<sub>3</sub>/MGO composite was studied for its ability to activate peroxymonosulphate (PMS) and generate active radicals for the degradation of ciprofloxacin (CIP). Degradation tests were performed at pH 7 with a CIP concentration of 20&#xa0;mg&#xa0;×&#xa0;l<sup>−1</sup>, the Al<sub>2</sub>O<sub>3</sub>/MGO dose of 2.0&#xa0;g·l<sup>−1</sup>, and the PMS dose of 2.0&#xa0;g·l<sup>−1</sup>. In addition, the degradation of CIP and the stability of the Al<sub>2</sub>O<sub>3</sub>/MGO-activated-PMS system were consistent after three repeated experiments. Furthermore, sulphate radicals (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12034_2024_3362_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="40" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{SO}}_{4}^{ - \bullet}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mtext>SO</mtext> <mrow> <mn>4</mn> </mrow> <mrow> <mo>-</mo> <mo>∙</mo> </mrow> </msubsup> </math></EquationSource> </InlineEquation>) and hydroxyl radicals (<InlineEquation ID="IEq4001"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12034_2024_3362_Article_IEq4001.gif" Format="GIF" Height="7" Rendition="HTML" Resolution="72" Type="Linedraw" Width="9" /> </InlineMediaObject> <EquationSource Format="TEX">\(^{\bullet}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mo>∙</mo> </mmultiscripts> </math></EquationSource> </InlineEquation>OH) were detected during the degradation of CIP, leading to the formation of nine degradation intermediates. Additionally, two possible degradation pathways were proposed. The results of this study suggests a new mechanism for the degradation of CIP in Al<sub>2</sub>O<sub>3</sub>/MGO-activated-PMS system, which could be applied to sulphate radicals (<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12034_2024_3362_Article_IEq2.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="40" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{SO}}_{4}^{ - \bullet}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mtext>SO</mtext> <mrow> <mn>4</mn> </mrow> <mrow> <mo>-</mo> <mo>∙</mo> </mrow> </msubsup> </math></EquationSource> </InlineEquation>) advanced oxidation processes (SR-AOPs).</p>

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Degradation of ciprofloxacin with Al2O3/MGO as heterogeneous activator of peroxymonosulphate

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • Hong Wu,
  • Xue Long,
  • Jiayuan Qin,
  • Qiru Huang,
  • Debin Jiang,
  • Hao Long,
  • Xiaoping Wang

摘要

A nano-sized Al2O3/MGO composite was studied for its ability to activate peroxymonosulphate (PMS) and generate active radicals for the degradation of ciprofloxacin (CIP). Degradation tests were performed at pH 7 with a CIP concentration of 20 mg × l−1, the Al2O3/MGO dose of 2.0 g·l−1, and the PMS dose of 2.0 g·l−1. In addition, the degradation of CIP and the stability of the Al2O3/MGO-activated-PMS system were consistent after three repeated experiments. Furthermore, sulphate radicals ( \({\text{SO}}_{4}^{ - \bullet}\) SO 4 - ∙ ) and hydroxyl radicals ( \(^{\bullet}\) ∙ OH) were detected during the degradation of CIP, leading to the formation of nine degradation intermediates. Additionally, two possible degradation pathways were proposed. The results of this study suggests a new mechanism for the degradation of CIP in Al2O3/MGO-activated-PMS system, which could be applied to sulphate radicals ( \({\text{SO}}_{4}^{ - \bullet}\) SO 4 - ∙ ) advanced oxidation processes (SR-AOPs).