Recoverable amphiphilic polyoxoniobates catalyzing oxidative and hydrolytic decontamination of chemical warfare agent simulants in emulsion

摘要

Graphical abstractDisplay OmittedHighlights•Amphiphilic polyoxoniobates1-3were synthesized and characterized.•Catalyst3is active for hydrolytic and oxidative decontamination of CWA simulants.•This work represents the first emulsion catalytic system based on polyoxoniobates.•Catalyst3can be readily reused and maintains its activity after five cycles.AbstractAmphiphilic polyoxoniobates (PONbs), [CnH2n+1N(CH3)3]7HNb6O19(for1, n=14; for2, n=16; and for3, n=18), were successfully prepared by the electrostatic interaction of hexaniobate anions with quaternary ammoniums containing long alkyl chain, and thoroughly characterized by using various techniques including Fourier transform infrared (FT-IR),1H nuclear magnetic resonance (1H NMR),13C nuclear magnetic resonance (13C NMR), thermogravimetric analysis (TGA), and elemental analysis. All three PONbs were used in the emulsion systems to catalytically decontaminate chemical warfare agent simulants and the influences of quaternary ammonium cations, polyanions, and amount of catalyst on the catalytic efficiency have been evaluated. Under optimal conditions, catalyst3in emulsion can completely convert both a the nerve agent simulant, diethyl cyanophosphonate (DECP), in 2h by hydrolysis and a sulfur mustard simulant, 2-chloroethyl ethyl sulfide (CEES), in 20min by oxidation using nearly stoichiometric 3% aqueous H2O2. Moreover, the amphiphilic catalyst3can be simply separated and readily reused for five recycles without obvious losing its activity. To the best of our knowledge, this study represents the first example where the emulsions of PONbs are used in the catalysis.