Hole-embedding block strategy to synthesize the NMOFs-NADH model: Selective capture and reduction of formaldehyde in aqueous and gaseous phases

Abstract

A new NMOFs-NADH model (UiO-66-NADH) had been designed and synthesized utilizing the hole-embedding block strategy for self-adaptive pore radius to FA, and could selectively capture and confined reductive remove of FA as a good donor of hydrogen proton in aqueous and gaseous phases. With the catalysis of tetra(carboxyphenyl)porphyrin iron (Ⅱ) (Fe-TCPP), UiO-66-NADH could selectively convert FA to methanol deeply and efficiently up to 98.6% within 40 min. In addition, the regeneration of UiO-66-NAD+/UiO-66-NADH was performed by g-C3N4 via photocatalysis, and the recycled UiO-66-NADH still had high reduction activity after three cycles. While, a fixed bed reactor filled with UiO-66-NADH/Fe-TCPP mixture was employed for the selective absorption and removal of gaseous FA, also in the aqueous solution of some real samples. These results demonstrated that UiO-66-NADH/Fe-TCPP system had a great potential in environmental protection. The hole-embedding block strategy could be extended to related applications in air purification and environmental protection.