Journal
APPLIED SURFACE SCIENCE
Volume 412, Issue -, Pages 19-28Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.03.228
Keywords
Manganese oxide; Graphene oxide; Nanocomposite; Destructive adsorption; Nerve agent simulants; Dimethyl methyl phosphonate (DMMP); Triethyl phosphate (TEP)
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Funding
- Internal Student Grant Agency of the J. E. Purkyne University in Usti nad Labem [44201 15 0073 01]
- Ministry of Education, Youth and Sports of the Czech Republic [LM2015073]
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Graphene oxide/MnO2 nanocomposite was prepared by thermal hydrolysis of potassium permanganate (KMnO4) and 2-chloroacetamide aqueous solutions with graphene oxide (GO) suspension. The synthesized samples were characterized by specific surface area (BET) and porosity determination (BJH), X-ray Diffraction (XRD) and high-resolution electron microscopes (HRSEM, HRTEM). These nanocomposites were used in an experimental evaluation of their adsorption activity with nerve agent simulants dimethyl methyl phosphonate (DMMP) and triethyl phosphate (TEP) in aqueous media. The nanocomposites exhibited enhanced adsorptive degradation ability compared to pure manganese oxide (MnO2) and GO. The GO amount in the nanocomposites affected their degradation activity substantially. The best adsorption efficiency was observed for samples with moderate GO amount. Three methods were used to observe the mechanism of the nerve-agent simulants deactivation: Gas chromatography with mass spectrometry (GC MS), High -Performance Liquid Chromatography (HPLC) and in situ Infrared spectroscopy (FTIR). It was shown that the hydrolysis on the surface of prepared nanocomposites yields volatile primary alcohols (methanol and ethanol) as the main hydrolysis products. (C) 2017 Elsevier B.V. All rights reserved.
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