KNaPHI Photocatalytic Oxidation of 5-Hydroxymethylfurfural for Selective Production of 2,5-Furandicarboxylic Acid
Using KOH,NaOH and melamine as raw materials,the photocatalyst mixed sodium-potassium poly(hetazine imide)(KNaPHI)was prepared by a bottom-up method.The morphology,structure and elemental composition of catalyst were analyzed by SEM,TEM,FT-IR,XRD,XPS and ICP-OES.The redox potential,band structure and photoelectric properties of the photocatalyst were tested,and the performance of KNaPHI photocatalytic oxidation of 5-hydroxymethylfurfural(HMF)for preparation of 2,5-furandicarboxylic acid(FDCA)was investigated.The results showed that the KNaPHI catalyst was a lamellated block structure with a smooth and flat surface which mainly composed of five elements:C,N,O,K and Na.The catalyst had light absorption performance,which enabled the photogenerated carrier of the catalyst move in a directional manner,thus improving its photoelectric effect.Compared with conventional solid carbon nitride,KNaPHI nanoparticles could form a quasi-homogeneous solution in water,enabling efficient photocatalysis of the substrate.Under the optimal reaction conditions of 1 mmol(126 mg)HMF,3 mL water,40 mg catalyst,101.325 kPa O2,50 W UV light irradiation,and 24 h at room temperature,the conversion of HMF reached 82％and the selectivity of FDCA was 91％.After reaction for 5 times,the conversion and selectivity were only slightly reduced.The results of active substance capture experiments showed that O2-·and h+were the main active substances in photocatalytic oxidation of HMF to FDCA.
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