Abstract
Ultrathin manganese dioxide (MnO2) nanosheets with the thickness of 1–2nm were synthesized by chemical oxidation of Mn2+ ions in the presence of tetramethylammonium cations in an aqueous solution. The composite material MnO2/PET (polyethylene terephthalate) was prepared by impregnating PET into MnO2 nanosheets colloid. The impregnation time has a great influence on HCHO adsorption and removal efficiency. When the PET was impregnated in nanosheets colloid for 1h at room temperature, the concentration of HCHO decreased quickly within initial 10min and finally reached about 81% removal efficiency with an initial HCHO concentration of ∼200ppm. Moreover, the used MnO2/PET can be simply regenerated by heating at 105°C without any rinse treatment. Based on in-situ DRIFTS and TG-MS studies, the mechanism of formaldehyde removal and regeneration was proposed. All the results showed that as-synthesized MnO2/PET can be used as an effective, affordable, and recyclable materials to removal and oxide toxic HCHO in indoor air.
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