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<p>The triple molybdate of silver, aluminum and cobalt nanoparticles was synthesized via a solid-state method. X-ray diffraction analysis (XRD) was used to confirm the phase purity. Fourier-transform infrared (FTIR) and Raman spectroscopies were identified as characteristics of bond vibrations. The morphology study using Scanning Electron Microscopy (SEM) revealed the presence of agglomerate in the prepared nanoparticles. The Brunauer–Emmett–Teller (BET) was employed to determine the surface area and pore radius. Vibrational spectroscopy based on IR and Raman techniques provided insights into active phonon vibration modes in MoO<sub>4</sub>. The ultraviolet–visible (UV–Vis) spectroscopy showed that the considered molybdate present a large bond gap of about 3&#xa0;eV, favorable to interesting photocatalytic activity. A novel Ag<sub>0.9</sub>Al<sub>1.06</sub>Co<sub>2</sub>(MoO<sub>4</sub>)<sub>5</sub> nanoparticles were prepared and tested for the degradation of two toxic azo dyes Acid Black-52 (AB-52) and Acid Yellow-23 (AY-23) under solar light. The considered catalyst showed a super photocatalytic activity reaching over 69% and 93% degradation for AB-52 and AY-23 dyes. The kinetic rate constants were 0.183 ± 0.009&#xa0;h<sup>−1</sup> and 0.175 ± 0.031&#xa0;h<sup>−1</sup> for AB-52 and AY-23 dyes. Additionally, the recyclability of the prepared catalyst was tested by using it for three successive cycles. Thus, the Ag<sub>0.9</sub>Al<sub>1.06</sub>Co<sub>2</sub>(MoO<sub>4</sub>)<sub>5</sub> heterogeneous catalyst demonstrated excellent photocatalytic efficiency for degrading hazardous pollutants, environmental remediation and remained reusable in cyclic tests.</p>

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Enhanced solar-driven photocatalytic degradation of azo dyes using novel Ag0.9Al1.06Co2(MoO4)5 nanoparticles

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Rawia Nasri,
  • Tarek Larbi,
  • Mosbah Amlouk,
  • Mohamed Faouzi Zid

摘要

The triple molybdate of silver, aluminum and cobalt nanoparticles was synthesized via a solid-state method. X-ray diffraction analysis (XRD) was used to confirm the phase purity. Fourier-transform infrared (FTIR) and Raman spectroscopies were identified as characteristics of bond vibrations. The morphology study using Scanning Electron Microscopy (SEM) revealed the presence of agglomerate in the prepared nanoparticles. The Brunauer–Emmett–Teller (BET) was employed to determine the surface area and pore radius. Vibrational spectroscopy based on IR and Raman techniques provided insights into active phonon vibration modes in MoO4. The ultraviolet–visible (UV–Vis) spectroscopy showed that the considered molybdate present a large bond gap of about 3 eV, favorable to interesting photocatalytic activity. A novel Ag0.9Al1.06Co2(MoO4)5 nanoparticles were prepared and tested for the degradation of two toxic azo dyes Acid Black-52 (AB-52) and Acid Yellow-23 (AY-23) under solar light. The considered catalyst showed a super photocatalytic activity reaching over 69% and 93% degradation for AB-52 and AY-23 dyes. The kinetic rate constants were 0.183 ± 0.009 h−1 and 0.175 ± 0.031 h−1 for AB-52 and AY-23 dyes. Additionally, the recyclability of the prepared catalyst was tested by using it for three successive cycles. Thus, the Ag0.9Al1.06Co2(MoO4)5 heterogeneous catalyst demonstrated excellent photocatalytic efficiency for degrading hazardous pollutants, environmental remediation and remained reusable in cyclic tests.