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<p>Silver phosphate (Ag<sub>3</sub>PO<sub>4</sub>) is a promising visible-light photocatalyst but suffers from fast charge recombination and serious photocorrosion, while MIL-88A(Fe) faces stability issues and Fe<sup>3+</sup> leaching. In this work, a series of MIL-88A@Ag<sub>3</sub>PO<sub>4</sub> composites with rod-like (r-MIL-88A), spindle-like (s-MIL-88A), and diamond-like (d-MIL-88A) morphologies were prepared <i>via</i> an <i>in situ</i> growth method. The rod-like r-MIL-88A@6%Ag<sub>3</sub>PO<sub>4</sub> showed the optimal performance, with an initial concentration of phenol of 100&#xa0;ppm, degradation efficiency of 99.7% under visible light with H<sub>2</sub>O<sub>2</sub> concentration 100&#xa0;ppm. Fe<sup>3+</sup> leaching remained below 0.08&#xa0;mg/L, phenol removal efficiency from 99.7% to around 83%, while demonstrating remarkable reusability of the composite even after five consecutive cycles. Comprehensive characterization techniques, including X-ray diffraction(XRD), Scanning Electron Microscope(SEM), X-ray Photoelectron Spectroscopy(XPS), Brunauer–Emmett–Teller(BET), Ultraviolet–Visible spectroscopy(UV–VIS), Photoluminescence (PL), Electrochemical Impedance Spectroscopy(EIS), transient photocurrent and photoelectrochemical analysis confirmed the the successful coupling of MIL-88A and Ag<sub>3</sub>PO<sub>4</sub> alongwith efficient photogenerated charge separation and transfer efficiency. Radical scavenging experiments and electron spin resonance (ESR) confirmed that the main active species were photogenerated holes(h⁺), superoxide radicals(·O<sub>2</sub>⁻), and hydroxyl radicals (·OH), and in situ formed Ag⁰ served as an electron transfer bridge. This study provides a facile and simple strategy for developing highly active and stable metal–organic frameworks (MOF)-based composites for the purpose of remediating organic wastewater.</p>

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Synthesis of silver phosphate-coated MIL-88A composites with diverse morphologies to enhanced Fenton-like performance for phenol removal

  • 期刊论文

  • 发表日期：

    2026年4月18日

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  • Wenxiu Huang,
  • Nannan Zhao,
  • Wenhui Wang

摘要

Silver phosphate (Ag3PO4) is a promising visible-light photocatalyst but suffers from fast charge recombination and serious photocorrosion, while MIL-88A(Fe) faces stability issues and Fe3+ leaching. In this work, a series of MIL-88A@Ag3PO4 composites with rod-like (r-MIL-88A), spindle-like (s-MIL-88A), and diamond-like (d-MIL-88A) morphologies were prepared via an in situ growth method. The rod-like r-MIL-88A@6%Ag3PO4 showed the optimal performance, with an initial concentration of phenol of 100 ppm, degradation efficiency of 99.7% under visible light with H2O2 concentration 100 ppm. Fe3+ leaching remained below 0.08 mg/L, phenol removal efficiency from 99.7% to around 83%, while demonstrating remarkable reusability of the composite even after five consecutive cycles. Comprehensive characterization techniques, including X-ray diffraction(XRD), Scanning Electron Microscope(SEM), X-ray Photoelectron Spectroscopy(XPS), Brunauer–Emmett–Teller(BET), Ultraviolet–Visible spectroscopy(UV–VIS), Photoluminescence (PL), Electrochemical Impedance Spectroscopy(EIS), transient photocurrent and photoelectrochemical analysis confirmed the the successful coupling of MIL-88A and Ag3PO4 alongwith efficient photogenerated charge separation and transfer efficiency. Radical scavenging experiments and electron spin resonance (ESR) confirmed that the main active species were photogenerated holes(h⁺), superoxide radicals(·O2⁻), and hydroxyl radicals (·OH), and in situ formed Ag⁰ served as an electron transfer bridge. This study provides a facile and simple strategy for developing highly active and stable metal–organic frameworks (MOF)-based composites for the purpose of remediating organic wastewater.