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

[Display omitted] •Amphiphilic polyoxoniobates 1-3 were synthesized and characterized.•Catalyst 3 is active for hydrolytic and oxidative decontamination of CWA simulants.•This work represents the first emulsion catalytic system based on polyoxoniobates.•Catalyst 3 can be readily reused and maintains...

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Bibliographic Details
Published in:Journal of hazardous materials 2018-02, Vol.344, p.994-999
Main Authors: Li, Xiaoqin, Dong, Jing, Liu, Huifang, Sun, Xiangrong, Chi, Yingnan, Hu, Changwen
Format: Article
Language:English
Subjects:
Amphiphilic polyoxoniobates
Chemical warfare agent decontamination
Emulsion system
Hydrolysis
Selective oxidation
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Summary:[Display omitted] •Amphiphilic polyoxoniobates 1-3 were synthesized and characterized.•Catalyst 3 is active for hydrolytic and oxidative decontamination of CWA simulants.•This work represents the first emulsion catalytic system based on polyoxoniobates.•Catalyst 3 can be readily reused and maintains its activity after five cycles. Amphiphilic polyoxoniobates (PONbs), [CnH2n+1N(CH3)3]7HNb6O19 (for 1, n=14; for 2, n=16; and for 3, 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, catalyst 3 in 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 catalyst 3 can 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.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2017.11.061