Synthesis and Evaluation of Acid-base Bi-functional MOFs Catalyst Supported on PVDF Membrane for Glucose Dehydration to 5-HMF

Metal-organic frameworks (MOFs) catalysts loaded on carriers with acid-base functional active sites could be applied widely to heterogeneous catalysis, which can promote stability and activity. In this work, we report a modulated hydrothermal (MHT) method for the direct synthesis of acid-base bifunctional UiO-66 catalysts grafted to modified polyvinylidene fluoride (PVDF). Firstly, PVDF was modified by dopamine hydrochloride (PDA) in trimethylol aminomethane (tris) buffer, named as PDA@PVDF. Secondly, UiO-66 material was produced via the coordination of organic ligands with zirconium ions, and could be directly loaded onto PDA@PVDF. Moreover, MHT synthetic approach can be used to synthesize other identical structures MOFs with acid, base and acid-base catalysts by adjusting the ratio of monosodium 2-sulfoterephthalate and/or 2-aminoterephthalic. The obtained materials were characterized, and the catalytic performances of glucose to 5-hydroxymethylfurfural (5-HMF) have been evaluated. The developed facile reaction system with UiO-66 MOFs catalysts offers a new route to large-scale economical viable processes of carbohydrates conservation to 5-HMF.