Photocatalytic oxidation 5-Hydroxymethylfurfural to 2, 5-diformylfuran under air condition over porous TiO2@MOF.

It is of significance for this society to develop and utilize sustainable energy and renewable resources. Photocatalytic the transformation of biomass exhibits a variety of seductive advantages, including cost-effectiveness, sustainability, mild reaction conditions and environment-benign properties. However, in order to obtain a relative high yield, most photocatalytic oxidation of HMF systems employ O 2 as sole oxidant or adopt high light density condition, which is much higher than the natural sunlight density. In this work, we employ microwave-assisted post-synthetic metal exchange (PSE) method to synthesize porous TiO 2 @UIO-67-Zr/Ti composite as photocatalyst for the oxidation of HMF to DFF under air condition at low temperature (4 oC). SEM and FT-IR characterizations confirm the successful cation exchange of Ti4+ with Zr4+, and the Raman spectra confirm the existence of strong interactions between TiO 2 and UIO-67-Zr/Ti. This catalyst exhibits enhanced photocatalytic performance, achieving 94% conversion with more than 70% selectivity for DFF. Moreover, this system also exhibits wide substrates compatibility. Photocatalytic the transformation of HMF to DFF exhibits a variety of seductive advantages including cost-effectiveness, sustainability, mild reaction conditions and environment-benign properties. However, in order to obtain a relative high yield, most of photocatalytic oxidation of HMF to DFF systems employ O 2 as oxidant or adopt high light density condition, which is much higher than the natural sun light density, thus hindering these systems to be applied in industrial fields.In this work, the TiO 2 @UIO-67-Zr/Ti has been constructed with microwave assisted PSE method. This catalyst exhibits excellent photocatalytic performance, achieving 94% conversion with more than 70% selectivity under air conditon at low temperature (4 oC). [Display omitted] • Porous TiO 2 @UIO-67-Zr/Ti was constructed by microwave-assisted PSE method. • Ti4+ is coordinated into the frameworks of UIO-67 materials with PSE method. • The combination of TiO 2 with UIO-67-Zr/Ti can widen the light absorption range. • The interactions between TiO 2 and UIO-67-Zr/Ti can be proved by Raman and FT-IR. • TiO 2 @UIO-67-Zr/Ti can oxidize HMF to DFF at low temperature under air condition. [ABSTRACT FROM AUTHOR]