Preparation of g-C3N4/TiO2/RGO ternary composites and catalytic dehydration of fructose to 5-hydroxymethylfurfural
The g-C3N4/TiO2/RGO ternary composite was prepared by hydrothermal method and applied to the dehydration of fructose to 5-hydroxymethylfurfural(5-HMF).The morphology,crystal form,group and specific surface area of g-C3N4/TiO2/RGO ternary composites were characterized by SEM,TEM,XRD,FTIR and BET.The effects of reaction temperature,reaction time,catalyst dosage and solvent type for fructose conversion,5-HMF yield and selectivity were studied,and the stability of the catalyst was also investigated.The results showed that the g-C3N4/TiO2/RGO ternary composites had complex three-dimensional network structure,and the specific surface area reached 31.478 2 m2/g.The g-C3N4/TiO2/RGO ternary composites had good catalytic activity for fructose dehydration reaction.Under the conditions of fructose quality 5.0 g,dimethyl sulfoxide 15 mL,g-C3N4/TiO2/RGO dosage 1.0 g,reaction time 3 h and reaction temperature 150 ℃,the conversion of fructose was 98.5％,the yield of 5-HMF was 69.7％and the selectivity was 70.8％.After five cycles,the yield of 5-HMF still reached 58.8％.
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