Surface catalyzed reactions can be a convenient way to deactivate toxic chemical warfare agents (CWAs) and remove them from the contaminated environment. In this study, pure titanium oxide, magnesium hydroxide, and their composites TiO2/Mg(OH2) were prepared by thermal decomposition and precipitation of the titanium peroxo-complex and/or magnesium nitrate in an aqueous solution. The as-prepared composites were examined by XRD, XPS, HRTEM, and nitrogen physisorption. Their decontamination ability was tested on CWA surrogates and determined by high-performance liquid chromatography (HPLC) and gas chromatography coupled with mass spectrometry (GC-MS). Dimethyl methyl phosphonate (DMMP) was used as a G simulant for the nerve agents sarin (GB) and soman (GD) while 2-chloroethyl ethyl sulfide (2-CEES) and 2-chloroethyl phenyl sulfide (2-CEPS) were used as surrogates of sulfur mustard (HD). The activity of the as-prepared composites was correlated with acid-base properties determined by potentiometric titrations and pyridine adsorption studied by in situ DRIFTS. The mixing of Ti and Mg led to an increase of the surface area and the amount of surface -OH groups (with an increasing amount of Ti) that caused improved degradation of DMMP.

Faculty of Environment University of Jan Evangelista Purkyně in Ústí nad Labem Králova výšina 3132 7 400 96 Ústí nad Labem Czech Republic

Faculty of Science University of Jan Evangelista Purkyně in Ústí nad Labem České mládeže 8 400 96 Ústí nad Labem Czech Republic

Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68 Řež Czech Republic

Institute of Organic Chemistry with Centre of Phytochemistry Bulgarian Academy of Sciences Ak G Bontchev str bl 9 Sofia 1113 Bulgaria

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