Speakers
Description
5-Hydroxymethylfurfuraldehyde (HMF) is one of the furan derivatives that dehydrate from biomass-based reactants and can further oxidize into a bioplastic substitute. Generally, the oxidation reaction can be accomplished under high temperatures accompanied by the catalyst and oxidizing agent. Those traditional methods required expensive costs and enlarged chemical waste on big batch experiments. Herein, radiation technology has been inspired to apply in HMF conversion due to its ability to upscale for industrial applications. The study of HMF was conducted under gamma irradiation without catalyst in both organic solvent and aqueous solution. The gamma radiation is generated from Cobalt-60 source with a dose rate of 1.7 kGy/h and accumulates to the absorbed dose of 10, 20, and 30 kGy. Gamma-ray was found to partially conversed HMF, and the conversion increases respected to the gamma dose increase. HPLC analyzed the unirradiated and irradiated samples with a C18 column and 0.1% THA:MeOH (80:20) mobile phase. The obtained HPLC chromatogram showed that there is HMFCA intermediate formed after irradiation, and its formation can be enhanced in the presence of base. In addition, having strong base in the system can also drive the conversion forward to FFCA intermediate. Effect of solution solvent was noticed to be crucial key under irradiation while the atmospheric gases have almost no effect. The calculated percentage conversion of both HMF and FDCA under gamma irradiation implied its stability in DMSO and sensibility in DI, so biphasic solvent might be an attractive choice for converting the reactant to the tolerated products.
