Journal
MOLECULAR CATALYSIS
Volume 436, Issue -, Pages 10-18Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mcat.2017.04.012
Keywords
Graphitic carbon nitride; Visible light; Photocatalytic selective oxidation; 5-Hydroxymethylfurfural; 2,5-Diformylfuran
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Funding
- Nature Science Foundation of Zhejiang Province [LY16B030002]
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Metal-free graphitic carbon nitride (g-C3N4) catalyst was synthesized by a simple calcination of melamine. The characterization results indicate that the water treatment during preparation process is in favor of the formation of pore structure, enhancing light-harvest ability and suppressing the recombination of the photoexcited electron-hole pair. The as-prepared g-C3N4 catalyst was applied in the photocatalytic selective oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF). The effects of incident wavelength, solvent, reaction time and scavenger on the photocatalytic performance were investigated. The results indicate that O-center dot(2)- plays a key role as dominant active species in photocatalytic oxidation of 5-HMF. Compared with visible light, the UV light illumination is easier to cause the overoxidation of target product and thus leads to a lower DFF selectivity. Under the irradiation of light with wavelength > 400 nm, the highest DFF selectivity of 85.6% can be achieved with HMF conversion of 31.2% in the presence of O-2. (C) 2017 Elsevier B.V. All rights reserved.
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