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    Assembly of PDMS/SiO2-PTFE and activated carbon fibre as a liquid water-resistant gas sorbent structure

    Year: 2017

    Journal: Chem. Eng. J., Volume 325, OCT 1, page 433–441

    Authors: Park, Eun Ji; Kim, Ho Jong; Han, Sang Wook; Jeong, Jae Hwan; Kim, Il Hee; Seo, Hyun Ook; Kim, Young Dok

    Organizations: Civil Military Technology Cooperation Program; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2015R1A2A2A01003866]; Korea Basic Science Institute [D37613]

    Keywords: Dimethyl methylphosphonate (DMMP); Breakthrough experiment; Liquid water-resistant gas sorbent; Humidity effect

    Polytetrafluoroethylene (PTFE) membrane was dip-coated with a hexane-based solution containing polydimethylsiloxane (PDMS)-coated SiO2 nanoparticles, fluidic PDMS, and curing agent as a binder for imparting superhydrophobicity to the PTFE, with water contact angle above 160 degrees. The dip-coated PTFE membrane showed very high gas (dimethyl methylphosphonate (DMMP) and water vapours) permeability under humidity conditions of 0-32% of relative humidity and DMMP concentrations of about 1-2 ppms with a total gas flow of 15 sccm, yet completely repelled liquid water. We used the dip-coated PTFE membrane as a protective layer to prevent contact between the gas sorbent material (namely activated carbon fibre; ACF) and the liquid water. We studied the sorption behaviour of DMMP in an assembly of ACF and a protective layer under dry conditions and two different humidity conditions (16 and 32% RH). DMMP uptake was enhanced as relative humidity increased; however, in subsequent ex-situ FT-IR analysis, the intensity of the DMMP-related signal decreased with increasing humidity during the DMMP sorption experiments. Based on these results, we suggest that DMMP can mostly irreversibly chemisorb on ACF under dry conditions, but exhibits more dominantly reversible physisorption in the presence of water vapour. ACF can act as filter of DMMP under a wide range of humidity conditions, yet the DMMP uptake mechanism of ACF differs depending on the humidity of the environment. We demonstrate the potential application of our structure as a cartridge for respirator or protection garments. (C) 2017 Elsevier B.V. All rights reserved.
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