Among the transition metal oxide catalysts,man-ganese oxides have great potential for formaldehyde(HCHO)oxidation at ambient temperature because of their high activity,nontoxicity,low cost,and polybasic morphologies.In this work,a MnO2-based catalyst(M-MnO2)with an interconnected net-work structure was successfully synthesized by a one-step hydrothermal method.The M-MnO2 catalyst was composed of the main catalytic agent,δ-MnO2 nanosheets,dispersed in a nonactive framework material of y-MnOOH nanowires.The catalytic activity of M-MnO2 for HCHO oxidation at room temperature was much higher than that of the pure δ-MnO2 nanosheets.This is attributed to the special interconnected net-work structure.The special interconnected network structure has high dispersion and specific surface area,which can provide more surface active oxygen species and higher surface hydroxyl groups to realize rapid decomposition of HCHO.