Adsorption; Hydrophobic; Metal–organic frameworks (MOFs); polydimethylsiloxane (PDMS); Toluene; volatile organic compounds (VOCs); Adsorption site; Atmospheric moisture; Humid air; Hydrophobics; Metalorganic frameworks (MOFs); Metal–organic framework; Polydimethylsiloxane; Removal performance; Volatile organic compound; Volatile organic compound removals; Chemistry (all); Environmental Chemistry; Chemical Engineering (all); Industrial and Manufacturing Engineering; General Chemical Engineering; General Chemistry
Résumé :
[en] Competition for adsorption sites between atmospheric moisture and volatile organic compounds (VOCs) can significantly impact the VOC removal performance of novel metal–organic framework adsorbent such as MIL-101. MIL-101 has high surface area and high porosity, but its inherent hydrophilicity hinders selectivity for hydrophobic organic species in the presence of atmospheric moisture. In this study, a vapor phase deposition of polydimethylsiloxane (PDMS) was used to create more hydrophobic MIL-101 composites. The external hydrophobicity of the composites was evaluated through water contact angle measurements whereas the internal hydrophobicity was assessed using a vapor-sorption based hydrophobicity index. After an optimized vapor deposition time of 0.25 hr employing a low molecular weight PDMS, a MIL-101 composite with enhanced internal hydrophobicity and intact porosity was fabricated. The composite's efficacy for VOC capture was investigated through toluene-water vapor co-adsorption experiments which involved vapor adsorption at 40% RH and at two toluene concentrations: 0.5% P/P0 and 10% P/P0. At 0.5% toluene P/P0, the new composite exhibited almost 60% higher adsorption capacity and 34% higher overall capture rate relative to pristine MIL-101 due to the presence of a hydrophobic PDMS layer which delayed the onset of water condensation in the mesopores. At 10% toluene P/P0, the new composite's overall toluene uptake was 2.8 times higher than activated carbon, but slightly lower than pristine MIL-101. This new composite also showed excellent structural stability and adsorption performance after 10 sorption/desorption cycles. The superior performance of the MIL-101-PDMS composite could be utilized to selectively remove toluene from real world humidities and VOC concentrations.
Disciplines :
Ingénierie chimique
Auteur, co-auteur :
Mohd Azmi, Luqman Hakim; Department of Chemical Engineering, Imperial College London, London, United Kingdom ; Grantham Institute – Climate Change and the Environment, Imperial College London, London, United Kingdom
Cherukupally, Pavani ; Department of Chemical Engineering, Imperial College London, London, United Kingdom
Hunter-Sellars, Elwin ; Department of Chemical Engineering, Imperial College London, London, United Kingdom
LADEWIG, Bradley Paul ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE) ; Department of Chemical Engineering, Imperial College London, London, United Kingdom ; Institute of Micro Process Engineering (IMVT), Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
Williams, Daryl R. ; Department of Chemical Engineering, Imperial College London, London, United Kingdom
Co-auteurs externes :
yes
Langue du document :
Anglais
Titre :
Fabrication of MIL-101-polydimethylsiloxane composites for environmental toluene abatement from humid air
Engineering and Physical Sciences Research Council Procter and Gamble
Subventionnement (détails) :
The authors are grateful to Patricia Carry and Kaho Cheung for their assistance with adsorbent characterization experiments. L. H. Mohd Azmi would like to thank Yayasan Khazanah for the PhD sponsorship that made this work possible. E. Hunter-Sellars would like to thank the EPSRC Centre for Doctoral Training in Advanced Characterization of Materials (grant reference: EP/L015277/1), as well as Procter & Gamble Co., USA, for funding his work. P. Cherukupally and D. R. Williams are grateful for the Research England’s Global Challenges Research Fund.
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