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Characterization and selection of PDMS solvents for the absorption and biodegradation of hydrophobic VOCs

Abstract : BACKGROUND : Four silicone oils (PolyDiMethylSiloxane, PDMS) of different viscosities, namely 5, 20, 50, and 100 mPa s were characterized to select the most suitable polymer for the biol. treatment of toluene. The PDMS volatilities and the partition coeffs. of toluene between air and PDMS were investigated. Toluene biodegrdn. tests were also carried out to assess the absence of toxicity of the considered PDMS vis-a-vis the microorganisms. RESULTS : PDMS 20, 50 and 100 had negligible volatilities at 25 °C and 35 °C, whereas PDMS 5 was volatile even at 25 °C. The results indicate that the amt. of VOCs emitted by PDMS increased with the temp. according to a logarithmic law. The partition coeff. of toluene between air and the four PDMS were similar (H = 2.9 Pa m3 mol-1) indicating that the affinity between toluene and PDMS was identical whatever their viscosity. Moreover, biodegrdn. tests allowed the conclusion that the four PDMS tested are not toxic for microorganisms. CONCLUSION : PDMS 20, 50 and 100 were suitable at 25 °C for the biol. treatment of toluene. Since all these PDMS were satisfactory at 25 °C, it could make sense to select the least viscous oil for use in the process, i.e. PDMS 20. © 2015 Society of Chem. Industry.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01191804
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Submitted on : Wednesday, September 2, 2015 - 3:36:42 PM
Last modification on : Friday, July 10, 2020 - 4:18:30 PM

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Maxime Guillerm, Annabelle Couvert, Abdeltif Amrane, Eric Dumont, Edith Norrant, et al.. Characterization and selection of PDMS solvents for the absorption and biodegradation of hydrophobic VOCs. Journal of Chemical Technology and Biotechnology, Wiley, 2016, 9 (6), pp.1923-1927. ⟨10.1002/jctb.4792⟩. ⟨hal-01191804⟩

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