Manganese dioxide nanoparticles-silver-Y zeolite as a nanocomposite catalyst for the decontamination reactions of O, S-diethyl methyl phosphonothiolate

Abstract

The decontamination reactions of O,S-diethyl methyl phosphonothiolate, as an agricultural organophosphorous pesticide onto 20 wt% loaded manganese dioxide nanoparticles-silver-Y zeolite as a nanocomposite catalyst in different solvents, were evaluated and monitored by means of gas chromatography-flame ionization detector and gas chromatography-mass spectrometry. Prior to the reaction, the catalyst was synthesized in three steps: at first, sodium-Y zeolite was prepared by hydrothermal method; then, silver-Y zeolite was prepared from sodium-Y zeolite using ion exchange procedure; and finally, manganese dioxide nanoparticles were synthesized by in situ impregnation method by pouring the pre-prepared silver-Y zeolite into manganese(II) nitrate solution and loaded as 20 wt% onto silver-Y zeolite structure. The formation of the synthesized units and final nanocomposite catalyst was verified through scanning electron microscopy, X-ray diffraction, atomic absorption spectrometry and Fourier transform-infrared spectroscopy techniques. Gas chromatography chromatograms showed that O,S-diethyl methyl phosphonothiolate was decontaminated perfectly by the catalyst in n-heptane solvent after 8 h, at room temperature, while chloroform and isopropanol solvents and other reaction times gave lower decontamination results. Moreover, gas chromatography-mass spectrometry chromatograms confirmed the formation of ethyl methyl phosphonic acid as a major and final product, which exemplifies the role of hydrolysis reaction during the degradation progress.

Utilization of Various Analogy of Synthetic Nanoporous Zeolites and Composite of Zeolites for Decontamination/Detoxification of CWA Simulants—An Updated Review

“…K. Dastafkan et al [102] (2015) reported 20 wt% MnO 2 NPs-AgY zeolite catalysts in different solvents for decontamination reactions of O,S-diethyl methyl phosphonothiolate (OSDEMP), as an agricultural organophosphorus pesti-International Journal of Nonferrous Metallurgy cide. This reaction was studied by GC-FID and GC-MS techniques.…”

Effective removal of radioactive 90Sr by CuO NPs/Ag-clinoptilolite zeolite composite adsorbent from water sample: isotherm, kinetic and thermodynamic reactions study

“…The Elovich equation can be simplified if it is presumed that abt ) 1. At the boundary conditions qt ¼ 0 at t ¼ 0, the above mentioned equation changes to (18) [45]. Plot of Elovich kinetics is given.…”

“…As reported in previous researches, the natural clinoptilolite zeolite shows a high adsorbent capacity for the removal of non-radioactive strontium ions [16,17]. The procedures for modifying zeolites are usually done by impregnation [18] and ion-exchange [17]. Also, the dispersion of metal oxide nanoparticles onto zeolite depends on the type of metal precursor used and its action during the preparation method.…”

Zinc oxide nanocubes as a destructive nanoadsorbent for the neutralization chemistry of 2-chloroethyl phenyl sulfide: A sulfur mustard simulant

“…The surface atoms are unsaturated and have high chemical activity and adsorption capacity to many substances [9]. High surface area and the reactive sites tailored in the form of edge and corner defects along with unusual lattice planes react in a stoichiometric way, thereby rendering the adsorbed toxic agents into non-toxic and less-toxic ones [10]. Besides, the reactions are analogous to their solution behavior.…”