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Abstract <p>To alleviate antibiotic pollution in aqueous environments, a CuSiO<InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(_3\)</EquationSource> </InlineEquation>/Ag<InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(_6\)</EquationSource> </InlineEquation>Si<InlineEquation ID="IEq11"> <EquationSource Format="TEX">\(_2\)</EquationSource> </InlineEquation>O<InlineEquation ID="IEq12"> <EquationSource Format="TEX">\(_7\)</EquationSource> </InlineEquation>-Palygorskite (Cu/Ag-Pal) heterojunction photocatalyst was synthesized. The ternary Type-I/Type-II heterostructure effectively accelerated the separation and directional migration of photogenerated carriers, where electrons accumulated in Ag<InlineEquation ID="IEq13"> <EquationSource Format="TEX">\(_6\)</EquationSource> </InlineEquation>Si<InlineEquation ID="IEq14"> <EquationSource Format="TEX">\(_2\)</EquationSource> </InlineEquation>O<InlineEquation ID="IEq15"> <EquationSource Format="TEX">\(_7\)</EquationSource> </InlineEquation> and holes enriched in CuSiO<InlineEquation ID="IEq16"> <EquationSource Format="TEX">\(_3\)</EquationSource> </InlineEquation>, thus inhibiting carrier recombination and facilitating efficient peroxydisulfate (PDS) activation. Under visible light, the Cu/Ag-Pal/PDS system removed 95% of norfloxacin (NOR) within 30 min. Mechanistic studies demonstrated that NOR degradation was dominated by the <InlineEquation ID="IEq17"> <EquationSource Format="TEX">\(^{1}\)</EquationSource> </InlineEquation>O<InlineEquation ID="IEq18"> <EquationSource Format="TEX">\(_2\)</EquationSource> </InlineEquation>-mediated non-radical pathway, accompanied by O<InlineEquation ID="IEq19"> <EquationSource Format="TEX">\(_2^{\bullet -}\)</EquationSource> </InlineEquation>, SO<InlineEquation ID="IEq20"> <EquationSource Format="TEX">\(_4^{\bullet -}\)</EquationSource> </InlineEquation> and HO<InlineEquation ID="IEq21"> <EquationSource Format="TEX">\(^{\bullet }\)</EquationSource> </InlineEquation>. NOR was decomposed mainly via piperazine ring opening, defluorination, decarboxylation, and quinolone oxidation, and most intermediates showed decreased ecotoxicity. This work provides a feasible strategy for efficient antibiotic wastewater remediation.</p> Graphical Abstract <p></p>

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Synergistic Photocatalytic Activation of Peroxydisulfate by a CuSiO\(_3\)/Ag\(_6\)Si\(_2\)O\(_7\)-Palygorskite Heterojunction: Dominant Role of Singlet Oxygen in Norfloxacin Degradation

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Yang Lai,
  • Haiyan Liu,
  • Chengnan Huang,
  • Huihui Li,
  • Linlin Qin,
  • Daming Huang,
  • Hanbing Zhang,
  • Guifang Wang

摘要

Abstract

To alleviate antibiotic pollution in aqueous environments, a CuSiO \(_3\) /Ag \(_6\) Si \(_2\) O \(_7\) -Palygorskite (Cu/Ag-Pal) heterojunction photocatalyst was synthesized. The ternary Type-I/Type-II heterostructure effectively accelerated the separation and directional migration of photogenerated carriers, where electrons accumulated in Ag \(_6\) Si \(_2\) O \(_7\) and holes enriched in CuSiO \(_3\) , thus inhibiting carrier recombination and facilitating efficient peroxydisulfate (PDS) activation. Under visible light, the Cu/Ag-Pal/PDS system removed 95% of norfloxacin (NOR) within 30 min. Mechanistic studies demonstrated that NOR degradation was dominated by the \(^{1}\) O \(_2\) -mediated non-radical pathway, accompanied by O \(_2^{\bullet -}\) , SO \(_4^{\bullet -}\) and HO \(^{\bullet }\) . NOR was decomposed mainly via piperazine ring opening, defluorination, decarboxylation, and quinolone oxidation, and most intermediates showed decreased ecotoxicity. This work provides a feasible strategy for efficient antibiotic wastewater remediation.

Graphical Abstract