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<p>This study presents the rational design and synthesis of a novel heterogeneous nanocatalyst, CSBs@V (Chitosan@VO[(acac)<sub>2</sub>en]), constructed through a three-step, energy-efficient protocol: (i) solvent-free condensation of acetylacetone with ethylenediamine to generate an aliphatic Schiff base ligand, (ii) immobilization onto chitosan via methanol-mediated reflux, and (iii) coordination of oxovanadium(IV) to afford a chitosan-anchored VO(acac)<sub>2</sub>-Schiff base nanohybrid. Comprehensive characterization by FT-IR, FE-SEM/EDX, TEM, BET, TGA, and elemental mapping confirms uniform dispersion of vanadium active sites within the chitosan scaffold, mesoporous textural features, and high thermal stability. Under optimized conditions (70&#xa0;°C, TBHP, acetonitrile), CSBs@V achieves selective oxidation of benzyl alcohol to benzaldehyde with 88–98% isolated yield at 0.14&#xa0;mol% V loading, with &gt; 95% selectivity and rapid conversion. The catalyst retains &gt; 87% of its initial activity over five consecutive cycles, with only minor vanadium leaching (~ 7%) and preserved morphology upon reuse. Key advantages include a biodegradable chitosan support, mild reaction conditions, facile catalyst recovery, and minimal metal leaching. The synergy between vanadium redox chemistry and the sustainable polysaccharide framework offers a scalable, eco-friendly platform for green oxidation catalysis, providing a robust foundation for mechanistic studies, substrate expansion, and industrial implementation.</p>

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Efficient and Selective Oxidation of Aromatic Benzyl Alcohols to Their Corresponding Aldehydes Catalyzed by a Chitosan-Anchored VO(acac)2en-Schiff Base Nanohybrid

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • Nazli Kianersi,
  • Moslem Setoodehkhah

摘要

This study presents the rational design and synthesis of a novel heterogeneous nanocatalyst, CSBs@V (Chitosan@VO[(acac)2en]), constructed through a three-step, energy-efficient protocol: (i) solvent-free condensation of acetylacetone with ethylenediamine to generate an aliphatic Schiff base ligand, (ii) immobilization onto chitosan via methanol-mediated reflux, and (iii) coordination of oxovanadium(IV) to afford a chitosan-anchored VO(acac)2-Schiff base nanohybrid. Comprehensive characterization by FT-IR, FE-SEM/EDX, TEM, BET, TGA, and elemental mapping confirms uniform dispersion of vanadium active sites within the chitosan scaffold, mesoporous textural features, and high thermal stability. Under optimized conditions (70 °C, TBHP, acetonitrile), CSBs@V achieves selective oxidation of benzyl alcohol to benzaldehyde with 88–98% isolated yield at 0.14 mol% V loading, with > 95% selectivity and rapid conversion. The catalyst retains > 87% of its initial activity over five consecutive cycles, with only minor vanadium leaching (~ 7%) and preserved morphology upon reuse. Key advantages include a biodegradable chitosan support, mild reaction conditions, facile catalyst recovery, and minimal metal leaching. The synergy between vanadium redox chemistry and the sustainable polysaccharide framework offers a scalable, eco-friendly platform for green oxidation catalysis, providing a robust foundation for mechanistic studies, substrate expansion, and industrial implementation.