▎ 摘　　要

NOVELTY - A graphene-manganese oxide composite catalyst for low-temperature catalytic oxidation of formaldehyde, comprises graphene nanoplatelet and manganese oxide nanoplate supported on graphene nanoplatelet. USE - Graphene-manganese oxide composite catalyst for low-temperature catalytic oxidation of formaldehyde in indoor environment. ADVANTAGE - The graphene-manganese oxide composite catalyst is non-toxic and economical, and enables low-temperature catalytic oxidation of formaldehyde by simple process at low energy consumption. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation method of graphene-manganese oxide composite catalyst for low-temperature catalytic oxidation of formaldehyde, involves (1) ultrasonically dispersing graphene oxide in deionized water for 10-60 minutes to obtain graphene oxide dispersion, transferring the graphite oxide dispersion to reactor, sealing and heating at 80-200 degrees C for 6-18 hours, centrifuging, washing and freeze drying to obtain graphene nanosheets, (2) mixing graphene nanosheets with potassium permanganate aqueous solution, stirring for 10-24 hours at room temperature, after the reaction is complete, washing, filtering and freeze drying; and (2) application of graphene-manganese oxide composite catalyst for low-temperature catalytic oxidation of formaldehyde, involves (1) adding graphene-manganese oxide complex catalyst to fixed-bed quartz reactor, (2) adding formaldehyde solution vapors and mixing to obtain gaseous formaldehyde, (3) heating the gaseous formaldehyde and graphene-manganese oxide composite catalyst at 30-200 degrees C, collecting the tail gas and testing.