Abstract
Among the transition metal oxide catalysts, manganese 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 network 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 γ-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 network 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.
Highlights
Formaldehyde (HCHO) is a typical indoor air pollutant that is mainly released from furnishings and building materials [1,2,3]
Mainly containing Pt, Au, Pd, and Ag as the active component supported on various metal oxides (TiO2, Al2O3, ZrO2, and Fe2O3), show high performance for HCHO oxidation at ambient temperature [11,12,13,14]
The c-MnOOH as a framework support plays an essential role in the network structure, and d-MnO2 is dispersed on the framework
Summary
Formaldehyde (HCHO) is a typical indoor air pollutant that is mainly released from furnishings and building materials [1,2,3]. Mainly containing Pt, Au, Pd, and Ag as the active component supported on various metal oxides (TiO2, Al2O3, ZrO2, and Fe2O3), show high performance for HCHO oxidation at ambient temperature [11,12,13,14]. In the past few years, MnO2 has usually been supported on carbon materials (graphene hydrogel, carbon foam, carbon nanotubes, and carbon fibers) to solve the problem of agglomeration [28, 29] These carbon materials are inert components in catalysts and may cover the active sites for catalytic reactions. A one-step hydrothermal method for the fabrication of a MnO2-based catalyst (M-MnO2) composed of d-MnO2 nanosheets anchored on a nanowire-shaped cMnOOH framework is described It exhibits high performance for HCHO oxidation at room temperature
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