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Tunable gas selectivity of cellulose nanocrystals – Polyethylene glycol composite membranes.

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Title: Tunable gas selectivity of cellulose nanocrystals – Polyethylene glycol composite membranes.
Authors: Checchetto, R.1 (AUTHOR) riccardo.checchetto@unitn.it, Facchinelli, T.1 (AUTHOR), Cantalini, G.1 (AUTHOR), Scarpa, M.1 (AUTHOR)
Source: International Journal of Hydrogen Energy. Feb2024, Vol. 57, p688-695. 8p.
Subjects: Cellulose nanocrystals, Composite membranes (Chemistry), Carbon dioxide, Ethylene glycol, Gases, Polyethylene glycol, Polymersomes
Abstract: The kinetics of the CO 2 , D 2 and CH 4 transport through self-supporting cellulose nanocrystals (CNCs) films containing low-molecular weight poly(ethylene glycol) (PEG) additive as plasticizer agent was studied in single gas condition at 293 K and sub-atmospheric feed pressure. Neat CNC and PEG-CNC with 7 wt % PEG films act as impermeable barrier for CO 2 and CH 4 and exhibit D 2 permeability values not larger than 0.05 barrer with penetrant diffusivity in the 10−10 cm2/s range. PEG addition at larger contents improves the permeability and diffusivity of all penetrant gases and gives to the PEG-CNC membrane a CO 2 selective character. The CO 2 permeability and ideal CO 2 /D 2 selectivity of the PEG-CNC films are 0.42 ± 0.04 barrer and ∼3, respectively, at 14 wt % PEG content, 2.5 ± 0.2 barrer and ∼5 at 21 wt % PEG. The preferred CO 2 transport exhibits a solution-selective character being the D 2 diffusivity a factor ∼10 larger than the CO 2 diffusivity. PEG addition, on the contrary, does not change the D 2 selective character for the D 2 /CH 4 gas couple. PEG well mixed with the gas-impermeable CNCs increases the PEG-CNC free volume and preferentially improves the CO 2 solubility given the specific interactions between the quadrupolar CO 2 penetrant and the dipolar ether groups of the PEG additive. [Display omitted] • Tuning the gas transport rates and selectivity of CNC- based membranes. • Tuning by adding selected amounts of PEG plasticizer. • Neat CNCs membrane acts as CO 2 barrier for the D 2 /CO 2 gas couple. • CNCs membrane with 21 wt % PEG acts as CO 2 selective membrane. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The kinetics of the CO 2 , D 2 and CH 4 transport through self-supporting cellulose nanocrystals (CNCs) films containing low-molecular weight poly(ethylene glycol) (PEG) additive as plasticizer agent was studied in single gas condition at 293 K and sub-atmospheric feed pressure. Neat CNC and PEG-CNC with 7 wt % PEG films act as impermeable barrier for CO 2 and CH 4 and exhibit D 2 permeability values not larger than 0.05 barrer with penetrant diffusivity in the 10−10 cm2/s range. PEG addition at larger contents improves the permeability and diffusivity of all penetrant gases and gives to the PEG-CNC membrane a CO 2 selective character. The CO 2 permeability and ideal CO 2 /D 2 selectivity of the PEG-CNC films are 0.42 ± 0.04 barrer and ∼3, respectively, at 14 wt % PEG content, 2.5 ± 0.2 barrer and ∼5 at 21 wt % PEG. The preferred CO 2 transport exhibits a solution-selective character being the D 2 diffusivity a factor ∼10 larger than the CO 2 diffusivity. PEG addition, on the contrary, does not change the D 2 selective character for the D 2 /CH 4 gas couple. PEG well mixed with the gas-impermeable CNCs increases the PEG-CNC free volume and preferentially improves the CO 2 solubility given the specific interactions between the quadrupolar CO 2 penetrant and the dipolar ether groups of the PEG additive. [Display omitted] • Tuning the gas transport rates and selectivity of CNC- based membranes. • Tuning by adding selected amounts of PEG plasticizer. • Neat CNCs membrane acts as CO 2 barrier for the D 2 /CO 2 gas couple. • CNCs membrane with 21 wt % PEG acts as CO 2 selective membrane. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2024.01.024