(639f) Colorimetric Sensing and Photocatalytic Decomposition of Mustard Gas Surrogates on Polyoxometalate-Based Oxidants

Authors: 
Colon, J., Rutgers, The State University of New Jersey
Giannakoudakis, D. A., The City College of New York
Landers, J. M., Edgewood Chemical Biological Center
Murali, S., Rutgers, The State University of New Jersey
Florent, M., The City College of New Yok
Neimark, A., Rutgers, The State University of New Jersey
Bandosz, T. J., The City College of New York
The polyoxometalate (POM) based oxidants synthesized showed multifunctional capabilities. When exposed to chemical warfare agents (CWA) vapors, particularly mustard-gas surrogate vapors, 2-chloroethyl ethyl sulfide (CEES) and ethyl ethyl sulfide (EES), the POM-based oxidant did show colorimetric sensing capabilities (color transition from yellow to dark green). In addition, it was also capable of photo-reactive decomposition of CEES and EES. The POM-based oxidant consists predominantly of the Keggin-type K5CoW12O40·20H2O. The estimated in-direct band gap was found to be in the blue region of visible light. The degradation of CEES and EES to non-toxic compounds can be linked to surface photo-reactivity and the ability of the oxidant to promote the formation of hydroxyl radicals. This work investigates the mechanisms involved in the oxidation of CEES and EES vapors against POM-based oxidants under different conditions.