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<p>A versatile and sustainable approach has been developed for the selective benzyl alcohol oxidation by polyvinyl alcohol (PVA)-based Ag nanofluid as a photocatalyst. Ag nanofluid (or colloidal Ag NPs) was synthesized simply in a PVA solution, which plays the role of a strong stabilizer, solvent, and surfactant. Based on characterization studies, silver nanoparticles have a hydrodynamic diameter of 6.4&#xa0;μm and a microcrystalline diameter of 55&#xa0;nm. The silver nanofluid in the presence of molecular oxygen is capable of oxidizing benzyl alcohols to benzaldehyde under mild conditions. However, under UV light with a wavelength of 365&#xa0;nm, the oxidation proceeds selectively to benzoic acid photocatalytically. Based on the results of TEM, DLS, and zeta, PVA as a coating increases the hydrodynamic diameter and reduces the zeta potential, and prevents the particles from sticking and agglomeration. The reactions support a radical mechanism. The nanofluid is recyclable and maintains its catalytic properties for at least 7 consecutive times. The nanofluid also has direct scalability, and increasing the oxidation scale to 50&#xa0;mmol had a negligible effect on the oxidation efficiency.</p> Graphical abstract <p>A versatile and sustainable approach has been developed for the selective benzyl alcohol oxidation by PVA-based Ag nanofluid photocatalyst</p>

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Recyclable silver nanofluid (colloidal) as an efficient photocatalyst or catalytic solvent for the selective benzyl alcohol oxidation

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Milad Kazemnejadi,
  • Shadan Seyyedaghili,
  • Zahra Mohammadalikhani,
  • Mohsen Esmaeilpour

摘要

A versatile and sustainable approach has been developed for the selective benzyl alcohol oxidation by polyvinyl alcohol (PVA)-based Ag nanofluid as a photocatalyst. Ag nanofluid (or colloidal Ag NPs) was synthesized simply in a PVA solution, which plays the role of a strong stabilizer, solvent, and surfactant. Based on characterization studies, silver nanoparticles have a hydrodynamic diameter of 6.4 μm and a microcrystalline diameter of 55 nm. The silver nanofluid in the presence of molecular oxygen is capable of oxidizing benzyl alcohols to benzaldehyde under mild conditions. However, under UV light with a wavelength of 365 nm, the oxidation proceeds selectively to benzoic acid photocatalytically. Based on the results of TEM, DLS, and zeta, PVA as a coating increases the hydrodynamic diameter and reduces the zeta potential, and prevents the particles from sticking and agglomeration. The reactions support a radical mechanism. The nanofluid is recyclable and maintains its catalytic properties for at least 7 consecutive times. The nanofluid also has direct scalability, and increasing the oxidation scale to 50 mmol had a negligible effect on the oxidation efficiency.

Graphical abstract

A versatile and sustainable approach has been developed for the selective benzyl alcohol oxidation by PVA-based Ag nanofluid photocatalyst