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Aerobic Oxidation of 5-Hydroxymethylfurfural (HMF) in Aqueous Medium over Fe-Doped-Poly(heptazine imide) Photocatalysts: Unveiling the Bad Role of Hydroxyl Radical Generation on the Catalytic Performance

Filho, José B G ; Silva, Ingrid F ; Alafandi, Mamdouh ; Rabeah, Jabor

Molecules (Basel, Switzerland), 2023-12, Vol.28 (24), p.8077 [Periódico revisado por pares]

Switzerland: MDPI AG

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  • Título:
    Aerobic Oxidation of 5-Hydroxymethylfurfural (HMF) in Aqueous Medium over Fe-Doped-Poly(heptazine imide) Photocatalysts: Unveiling the Bad Role of Hydroxyl Radical Generation on the Catalytic Performance
  • Autor: Filho, José B G ; Silva, Ingrid F ; Alafandi, Mamdouh ; Rabeah, Jabor
  • Assuntos: 5-hydroxymethylfurfural ; Biomass ; Carbon ; carbon nitride ; Cellulose ; Efficiency ; EPR ; Lignocellulose ; lignocellulose biomass ; Oxidation ; Photocatalysis ; Solvents ; Spectrum analysis
  • É parte de: Molecules (Basel, Switzerland), 2023-12, Vol.28 (24), p.8077
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: 5-hydroxymethylfurfural (HMF) oxidation in aqueous media using visible photocatalysis is a green and sustainable route for the valorization of lignocellulosic biomass derivatives. Several semiconductors have already been applied for this purpose; however, the use of Poly(heptazine imides), which has high crystallinity and a special cation exchange property that allows the replacement of the cation held between the layers of C N structure by transition metal ions (TM), remains scarce. In this study, PHI(Na) was synthesized using a melamine/NaCl method and used as precursor to prepare metal (Fe, Co, Ni, or Cu)-doped PHI catalysts. The catalysts were tested for selective oxidation of HMF to 2,5-diformylfuran (DFF) in water and O atmosphere under blue LED radiation. The catalytic results revealed that the 0.1 wt% PHI(Fe) catalyst is the most efficient photocatalyst while higher Fe loading (1 and 2 wt%) favors the formation of Fe clusters, which are responsible for the drop in HMF oxidation. Moreover, the 0.1 wt% PHI(Fe) photocatalyst has strong oxidative power due to its efficiency in H O production, thus boosting the generation of nonselective hydroxyl radicals ( OH) via different pathways that can destroy HMF. We found that using 50 mM, the highest DFF production rate (393 μmol·h ·g ) was obtained in an aqueous medium under visible light radiation.
  • Editor: Switzerland: MDPI AG
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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