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<p>A new series of cobalt-modified hexagonal mesoporous silica catalysts, denoted Co-HMS-<i>n</i>, where <i>n</i> corresponds to the molar ratio (Si/Co = 10, 20 and 50), was synthesized to evaluate its catalytic activity in the presence of NaBH<sub>4</sub> in the degradation of metronidazole (MNZ), an antibiotic known for its low non-biodegradability in aquatic environments. The obtained materials were characterized using several analytical techniques (XRF, XRD, FTIR, BET, XPS, SEM, and Raman). A single pure crystalline phase corresponding to the spinel Co<sub>3</sub>O<sub>4</sub>, with crystallites average size of 36.7 nm, was detected by X-ray. Different reaction parameters were evaluated to achieve optimal working conditions (NaBH<sub>4</sub> mass, catalyst mass, MNZ initial concentration, and pH). The MNZ degradation reaction was monitored by UV-visible spectroscopy, and the endpoints were confirmed by high-performance liquid chromatography (HPLC).The degradation products were identified by mass spectrometry. A catalytic efficiency of 100% was observed on Co-HMS-20 with a half-life <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11164_2025_5639_Article_IEq1.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="100" /> </InlineMediaObject> <EquationSource Format="TEX">\((t_{1/2} = 1.01\;{\text{s}})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">(</mo> <msub> <mi>t</mi> <mrow> <mn>1</mn> <mo stretchy="false">/</mo> <mn>2</mn> </mrow> </msub> <mo>=</mo> <mn>1.01</mn> <mspace width="0.277778em" /> <mtext>s</mtext> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>.</p>

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Cobalt-modified HMS mesoporous sieves-green highly active and efficient catalysts for removal of metronidazole by using NaBH4

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • Thiziri Djelloudi,
  • Ouardia Zekri,
  • Fouzia Touahra,
  • Franck Launay

摘要

A new series of cobalt-modified hexagonal mesoporous silica catalysts, denoted Co-HMS-n, where n corresponds to the molar ratio (Si/Co = 10, 20 and 50), was synthesized to evaluate its catalytic activity in the presence of NaBH4 in the degradation of metronidazole (MNZ), an antibiotic known for its low non-biodegradability in aquatic environments. The obtained materials were characterized using several analytical techniques (XRF, XRD, FTIR, BET, XPS, SEM, and Raman). A single pure crystalline phase corresponding to the spinel Co3O4, with crystallites average size of 36.7 nm, was detected by X-ray. Different reaction parameters were evaluated to achieve optimal working conditions (NaBH4 mass, catalyst mass, MNZ initial concentration, and pH). The MNZ degradation reaction was monitored by UV-visible spectroscopy, and the endpoints were confirmed by high-performance liquid chromatography (HPLC).The degradation products were identified by mass spectrometry. A catalytic efficiency of 100% was observed on Co-HMS-20 with a half-life \((t_{1/2} = 1.01\;{\text{s}})\) ( t 1 / 2 = 1.01 s ) .