Characterization and selection of PDMS solvents for the absorption and biodegradation of hydrophobic <scp>VOCs</scp>

Guillerm, Maxime; Couvert, Annabelle; Amrane, Abdeltif; Dumont, Éric; Norrant, Edith; Lesage, Nicolas; Juery, Catherine

doi:10.1002/jctb.4792

Cited by 22 publications

(15 citation statements)

References 20 publications

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“…Indeed, besides good absorption capacities for VOCs, these solvents are advantageously characterized by a low or a null vapor tension, a low miscibility in water and good thermal and chemical stabilities. Furthermore, being non-biodegradable and non-toxic, silicon oils and many ILs can be recycled by a biological process [3,[10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Assessment of VOC absorption in hydrophobic ionic liquids: Measurement of partition and diffusion coefficients and simulation of a packed column

Castillo

Biard

Guihéneuf

et al. 2019

Chemical Engineering Journal

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deltif Amrane, et al.. Assessment of VOC absorption in hydrophobic ionic liquids: Measurement of partition and diffusion coefficients and simulation of a packed column. Chemical Engineering Journal, Elsevier, 2019, 360, pp. AbstractPartition coefficients of toluene and dichloromethane (DCM) in 23 hydrophobic ionic liquids (ILs), which can be used potentially for the physical absorption of volatile organic compounds (VOCs), were measured at 298 K. The partition coefficients, expressed as Henry's law constants, were 400 to 1300 times for toluene and 10 to 47 times for DCM lower in the selected ILs than in water. Thus, the toluene and DCM diffusion coefficients were measured in three high potential hydrophobic ILs and in [Bmim][NTf 2 ] using a thermogravimetric microbalance. Diffusivity measurements were performed at 298K for toluene and between 278 and 308K for DCM. Diffusion coefficients in ILs, ranging between 1 and 4×10 -11 m 2 s -1 , were from 18 to 90 times lower than in water at 298 K. The diffusion coefficients were correlated to the temperature, the solute molar volume, the IL viscosity and molar volume with an average error of 4.2%. Finally, a 3 m industrial packed column was simulated for the removal of DCM and toluene in [AllylEt 2 S][NTf 2 ] and [bmim][NTf 2 ], which both present moderate viscosities of nearly 50 mPa s at 293K. The overall mass-transfer coefficient, the removal efficiency and the pressure drop were calculated and compared to those obtained using other heavy solvents (a silicon * Corresponding author : pierre-francois.biard@ensc-rennes.fr, Tel: + 33 2 23 23 81 49 2 oil and di-(2-ethylhexyl) adipate). This prospective simulation has demonstrated a good potential of ionic liquids for the toluene removal. Nonetheless, the DCM removal efficiencies simulated were lower than 44%. It suggests that even more efficient ionic liquids can be tuned and synthesized in the future for this specific application. Highlights Toluene partition coefficients in 23 ILs were in the range 0.5-3.5 Pa m 3 mol -1  Dichloromethane partition coefficients in 23 ILs were in the range 5-17 Pa m 3 mol -1  VOC diffusion coefficients in the range 1-4×10 -11 m 2 s -1 were measured in 4 ILs  The computed toluene removal efficiency in a packed column was from 52 to 99.6%  The computed dichloromethane removal efficiency in a packed column was lower than 44% Graphical abstractVicious air containing VOC: Treated air Ionic liquid Loaded ionic liquid Metal Pall rings 3.0 m 1.0 m •Toluene •Dichloromethane Operating conditions Hydrodynamics Mass-transfer rate (K l a°) Pressure drop Removal efficiency Solvent assessment for VOC removal in a packed column Partition coefficient Diffusion coefficient Ionic liquid properties (m, r, s) Static headspace method Static thermogravimetric method Measurements Simulation •[bmim][NTf 2 ] •[AllylEt 2 S][NTf 2 ] Finally, the hydrodynamics and mass-transfer in a packed column fed with [Bmim][NTf 2 ] and [AllylEt 2 S][NTf 2 ] were simulated for DCM and toluene absorption. * AR is the affinity r...

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Section: Introductionmentioning

confidence: 99%

Assessment of VOC absorption in hydrophobic ionic liquids: Measurement of partition and diffusion coefficients and simulation of a packed column

Castillo

Biard

Guihéneuf

et al. 2019

Chemical Engineering Journal

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“…PDMS 50, even being much more viscous than water, was selected because PDMS with lower viscosities (such as PDMS 5) are more volatile and emits VOC [13]. The fluid dynamics and mass-transfer rate were evaluated in the loading zone (i.e.…”

Section: Introductionmentioning

confidence: 99%

Volatile organic compounds absorption in packed column: theoretical assessment of water, DEHA and PDMS 50 as absorbents

Biard

Couvert

Giraudet

2018

Journal of Industrial and Engineering Chemistry

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A fixed volume packed column was simulated for the absorption at counter-current of four more or less hydrophobic volatile organic compounds (VOCs) in water and in two heavy organic solvents (PDMS 50, a silicone oil) and DEHA (Bis(2-ethylhexyl) adipate)). Reliable values of the mass-transfer coefficients were deduced allowing to calculate the VOCs removal efficiency. Disappointing performances in heavy solvents, lower than 60% for isopropanol and acetone, were computed in a 3 m height column and using mild conditions (atmospheric pressure and a liquid-togas mass flow rate ratio around 2). However, toluene removal efficiencies higher than 90% were simulated.

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“…However, the chemical method often involves the addition of chemical agents, easily leading to secondary pollution, and the biological method cannot treat high concentrations of oil and needs a relatively long time. As one of the physical methods, adsorption technology has been given ever greater attention because of its greater efficiency, simpler operation and fewer adverse effects than many alternatives . The key issue for the application of adsorption was to find high‐efficiency adsorbents.…”

Section: Introductionmentioning

confidence: 99%

“…Among all the newly developed adsorbents, superhydrophobic polymers were the most prospective materials that could selectively remove a wide range of concentrations of oil from wastewater . Up to now, several superhydrophobic adsorbents have been developed to adsorb oil from aqueous solution, such as polydimethylsiloxane (PDMS), polymethylsilsesquioxane (PMSQ), polytetrafluoroethylene (PTFE), and tetranitro‐9‐fluorenone (TENF) . Among them, polydivinylbenzene (PDVB), a kind of novel superhydrophobic material, has been attracting considerable attentions because of its high specific surface area, hollow structure and high cross‐linking degree, which were favourable to the adsorption of many pollutants in environment .…”

Section: Introductionmentioning

confidence: 99%

“…As one of the physical methods, adsorption technology has been given ever greater attention because of its greater efficiency, simpler operation and fewer adverse effects than many alternatives. 2,9 The key issue for the application of adsorption was to find high-efficiency adsorbents. However, conventional adsorbents, such as activated carbon, zeolite, chitosan and activated clay, had a relatively low adsorption capacity for oil, and their recycling and regeneration were not easy in practice, which impeded their application in oil adsorption.…”

Section: Introductionmentioning

confidence: 99%

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Efficient adsorption of oil in water by hydrophobic nonwoven fabrics coated with cross‐linked polydivinylbenzene fibers

Zhu

Wang

Liu

et al. 2018

J of Chemical Tech & Biotech

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Background Oil pollution of water causes extensive damage to the environment and human health. Adsorption techniques are environmentally friendly and relatively feasible to treat oil contamination and reclaim oil resources, and it is essential to develop adsorbents that have high adsorption capacity for oil which can be recycled and regenerated conveniently to save money and resources. Results Hydrophobic nonwoven fabrics coated with polydivinylbenzene nanofibres (HNF‐PDVB) were constructed by a one‐step cation polymerization reaction. The results showed that the optimal concentration of OTS (octadecylsilane) for the modification of nonwoven fibers was 1.22 mL L–1of n‐hexane. The HNF‐PDVB showed relatively good performance in adsorbing oil from water, with adsorption capacity as high as 7.5 g g–1. Freundlich and Dubinin–Radushkevic isotherms fitted well with the experimental data. The kinetic data fitted better to the pseudo‐second‐order and intraparticle diffusion models, and the parameters indicated that the adsorption by HNF‐PDVB involved macropores that contributed to the rapid and high‐capacity adsorption, as well as micropores that resulted in the diffusion of oil in the nanofibres. Thermodynamics studies revealed that the adsorption was spontaneous and endothermic, with an increasing performance when the temperature rose from 10 to 50 °C. The material possessed good stability and the adsorption capacity reduced from 7.5 g g–1 to 6.6 g g–1 after ten cycles of repeated use, recovered by squeezing and ethanol extraction. Conclusion This work demonstrates that the new hydrophobic nonwoven fabrics have the potential to be used for elimination of pollution from oil wastewater. © 2018 Society of Chemical Industry

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

Cited by 22 publications

References 20 publications

Assessment of VOC absorption in hydrophobic ionic liquids: Measurement of partition and diffusion coefficients and simulation of a packed column

Assessment of VOC absorption in hydrophobic ionic liquids: Measurement of partition and diffusion coefficients and simulation of a packed column

Volatile organic compounds absorption in packed column: theoretical assessment of water, DEHA and PDMS 50 as absorbents

Efficient adsorption of oil in water by hydrophobic nonwoven fabrics coated with cross‐linked polydivinylbenzene fibers

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