Preparation of polyoxometalate-doped aminosilane-modified silicate hybrid as a new barrier of chem-bio toxicant.

Nanohybrid membranes based on the Keggin-type polyoxometalate (POM) H ₅ PV ₂ Mo ₁₀ O ₄₀ and aminosilane-modified silicate (Ormosil and Ormosil(NR ₄ ⁺ Cl ^- )) hybrids were synthesized as a new barrier to protect against simulants of chemical and biological toxicant. The ³¹ P NMR and XPS results indicated that POM was bound to the Ormosil and Ormosil(NR ₄ ⁺ Cl ^- ) hybrids after impregnation. The antibacterial effects of the hybrids and hybrid-impregnated fabrics against Gram-negative and Gram-positive bacteria were investigated with zone of inhibition, minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC) and plate-counting method. The MIC/MBC values of Ormosil(NR ₄ ⁺ Cl ^- )/POM and Ormosil/POM against bacteria were 0.267/2.67 and 2.67/26.7, respectively, and the percentage reduction of bacteria was approximately 100% after 20 laundry cycles of their fabrics. The reaction products and mechanisms of the adsorptive degradation of 2-chloroethylethylsulfide (CEES) by hybrids were investigated with ¹³ C NMR. The results of this study showed that POM-doped Ormosil systems are capable of destroying bacteria and CEES.
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