Graphene oxide/MnO 2 nanocomposite as destructive adsorbent of nerve-agent simulants in aqueous media

• DOI: 10.1016/j.apsusc.2017.03.228
• Publication Date: 2017-03-27T18:19:13Z
• Authors: Martin Šťastný; Jakub Tolasz; Václav Štengl; Jiří Henych; David Žižka
• Keywords: Dimethyl methyl phosphonate (DMMP); Nanocomposite; Nerve agent simulants; Manganese oxide; 02 engineering and technology; Triethyl phosphate (TEP); 0210 nano-technology; 01 natural sciences; Destructive adsorption; Graphene oxide; 0104 chemical sciences

Abstract Graphene oxide/MnO 2 nanocomposite was prepared by thermal hydrolysis of potassium permanganate (KMnO 4 ) 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 (MnO 2 ) 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.