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Hierarchical NiMn2O4/rGO composite nanosheets decorated with Pt for low-temperature formaldehyde oxidation

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Abstract

Formaldehyde (HCHO) is a major pollutant affecting indoor air quality. Exposure to HCHO would cause serious health risks to humans, so it is an urgent issue to remove indoor HCHO. Catalytic oxidation is deemed to be the optimal method because of its efficiency and convenience. Herein, a hierarchical nanocomposite of spinel nickel–manganese mixed oxide (NiMn2O4) and reduced graphene oxide (rGO) was synthesized by a facile hydrothermal process, and platinum (Pt) nanoparticles were subsequently deposited by an impregnation–chemical reduction procedure. The Pt/NiMn2O4/rGO nanocomposite exhibited enhanced HCHO decomposition activity at room temperature, owing to its unique features. The hierarchical structure endows it with abundant pores and a large specific surface area, which favors the dispersion of Pt nanoparticles and contributes to more surface active sites. As revealed by X-ray photoelectron spectroscopy analysis, the interactions between components were also important factors for achieving the excellent catalytic performance, in that electron transfer between the components could promote the activation of surface oxygen species and adsorbed oxygen molecules. In situ diffuse reflectance infrared Fourier transform spectroscopy was performed to explore the oxidation mechanism, and the results showed that the major intermediates in the oxidation process were dioxymethylene and formate species. This study indicates that nanocomposites of rGO and transition metal oxide nanosheets are potential materials for efficient indoor air purification.

Graphical abstract: Hierarchical NiMn2O4/rGO composite nanosheets decorated with Pt for low-temperature formaldehyde oxidation

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Publication details

The article was received on 12 Jun 2019, accepted on 14 Nov 2019 and first published on 14 Nov 2019


Article type: Paper
DOI: 10.1039/C9EN00652D
Environ. Sci.: Nano, 2020, Advance Article

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    Hierarchical NiMn2O4/rGO composite nanosheets decorated with Pt for low-temperature formaldehyde oxidation

    Y. Wang, J. Ye, C. Jiang, Y. Le, B. Cheng and J. Yu, Environ. Sci.: Nano, 2020, Advance Article , DOI: 10.1039/C9EN00652D

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