Adsorption and Desorption of Chemical Warfare Agent Simulants on Silica Surfaces with Hydrophobic Coating

Abstract

Aim of our study is finding adsorbents suitable for pre-concentration of chemical warfare agents (CWAs). We considered Tenax, bare silica and polydimethylsiloxane (PDMS)-coated silica as adsorbents for dimethyl methylphosphonate (DMMP) and dipropylene glycol methyl ether (DPGME). Tenax showed lower thermal stability, and therefore, desorption of CWA simulants and decomposition of Tenax took place simultaneously. Silica-based adsorbents showed higher thermal stabilities than Tenax. A drawback of silica was that adsorption of CWA simulant (DMMP) was significantly reduced by pre-treatment of the adsorbents with humid air. In the case of PDMS-coated silica, influence of humidity for CWA simulant adsorption was less pronounced due to the hydrophobic nature of PDMS-coating. We propose that PDMS-coated silica can be of potential importance as adsorbent of CWAs for their pre-concentration, which can facilitate detection of these CWAs.

Porous Silica Particles as Oil Absorbents: Comparison of Meso‐, Macro‐, and Meso/Macro‐Structures

“…This implies that chemical interaction between the silica substrate and coated PDMS was weak. It is worth noting that the coating of PDMS thin films can be achieved on other substrates such as TiO 2 , ZnO, SiO 2 , Ni, and carbon using the same method as used in the present study, showing that the PDMS layer can form on the surface independent of the surface structure . This also indicates that the interaction of PDMS and the substrate surface can be regarded as weak van der Waals interactions.…”