Mono-transition-metal-substituted polyoxometalate intercalated layered double hydroxides for the catalytic decontamination of sulfur mustard simulant.

摘要: The Keggin-type mono-transition-metal-substituted [PW11M(H2O)O39]5− (PW11M, M = Ni, Co, Cu) were intercalated into Zn2Cr-based layered double hydroxide (Zn2Cr-LDH) by an exfoliation-reassembly method and the synthesized Zn2Cr-LDH-PW11M composites thoroughly characterized Fourier transform infrared (FT-IR) spectroscopy, powder X-ray diffraction (PXRD), solid state 31P nuclear magnetic resonance (31P NMR) thermogravimetric analysis (TGA), inductively coupled plasma atomic emission spectroscopy (ICP-AES), scanning electron microscopy (SEM) transmission (TEM). three can be used as heterogeneous catalysts to promote oxidative decontamination of sulfur mustard simulant 2-chloroethyl ethyl sulfide (CEES). Interestingly, a cooperative effect between PW11M cluster Zn2Cr-LDH is evidenced fact that have higher catalytic performance than either individual constituents alone. activity significantly influenced substituted transition metals, showing order: Zn2Cr-LDH-PW11Ni > Zn2Cr-LDH-PW11Co Zn2Cr-LDH-PW11Cu. Under ambient conditions, composite convert 98% CEES in 3 h using nearly stoichiometric 3% aqueous H2O2 with selectivity 94% for nontoxic product sulfoxide (CEESO). Moreover, decontaminating material, Zn2Cr-LDH-PW11Ni, stable leaching readily reused up ten cycles without obvious loss its activity.