Mixed Matrix Membranes based on PPO and graphene for gas ......Graphene WeightPercentageIncrease...
Transcript of Mixed Matrix Membranes based on PPO and graphene for gas ......Graphene WeightPercentageIncrease...
Graphene Weight Percentage Increase
Filler: XT7
Loading: 0.3 %
Filler: XT6
Loading: 1%
Filler: XT6
Loading: 5%
Filler: XT6
Loading: 15%
0 5 10 151
10
100
35°C
He CO
2
N2
Ga
s p
erm
eab
ilit
y (
Ba
rre
r)
Graphene loading (wt%)
0 5 10 151
10
100
200
65°C
He CO
2
N2
Ga
s p
erm
eab
ilit
y (B
arr
er)
Graphene loading (wt%)
0 5 10 151
10
100 He/CO
2
He/N2
CO2/N
2
Ideal sele
cti
vit
y
Graphene loading (wt%)
0 5 10 151
10
100
He/CO2
He/N2
CO2/N
2
Ideal
Sele
cti
vity
Graphene loading (wt%)
0 5 10 15-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8 He CO
2
N2
[P(6
5°C
)-P
(35
°C)]
/P(3
5°C
)
Graphene loading (wt%)
0 50.8
0.9
1.0
1.1
1.2
1.3
35°C He/CO2
He/N2
CO2/N
2
/
0
Graphene loading (wt%)
0 5 10 150.5
1.0
1.5
65°C He/CO2
He/N2
CO2/N
2
/
0
Graphene loading (wt%)
0 50.8
0.9
1.0
1.1
1.2
1.3
35°C He CO
2
N2
P/P
0
Graphene loading (wt%)
INTRODUCTION
SAMPLES PREPARATION FILLER CHARACTERISTICS
SEM PICTURES
PERMEABILITY & SELECTIVITY
CONCLUSIONS
In the table below we show the nanofillers geometrical
characteristics and the %wt in respect to PPO used in this study.
We fabricated new mixed matrix membranes (MMMs) based on poly(2,6-dimethyl-1,4-phenylene oxide), PPO, a dense permeable and hydrogen
selective glassy polymer. The MMMs were obtained by adding graphene at different percentages, up to 15%wt , and the gas transport properties
were measured via a pure gas permeometer at 35°C and 65°C.
Two different graphene nanoparticles, XT6 and XT7, provided by
Graphene XT were used for this study. Solid PPO (Sigma Aldrich)
was dissolved in chloroform (purity > 99,5%, Sigma Aldrich) at 5%wt
and, after the graphene addition, the suspension was sonicated, 15
min. and 1 hr. for XT6 and XT7 respectively, stirred for 1 day and
casted in a glassy Petri dish at 50 °C. A post-treatment at 200°C
under vacuum for 1 day stabilizes the polymer properties.
Filler Type Lateral Dimension Thickness %wt in PPOμm nm
XT6 5 6.0-8.0 1.0 - 5.0 - 15.0
XT7 20 2 0.3
• Graphene in small quantities enhances the PPO free volume, permeability & selectivity.
• Higher loadings of graphene increase the tortuosity and lower the PPO permeability.
• Graphene addition reduces the polymer chain mobility and the temperature-dependence of
permeability &selectivity of the polymer, ultimately enhancing its stability.
References
[1] R.Rea et al., Polymers 2018, 10,19
[2] L.Olivieri et al., Ind. Eng. Chem. Res. 2015, 54
[3] Y, Huang et al., J. Polym. Sci.: Part B: Polym. Phys. 2007, 45
[4]B.M. Yoo et al., Curr. Op. Chem. Eng. 2017, 16
Mixed Matrix Membranes based on PPO and graphene for gas separation
R. Rea*, M.G. De Angelis*, S. Ligi°, *M. Giacinti Baschetti** Università di Bologna, ° Graphene XT s.a.s
Sample #1 Sample #2 Sample #3 Sample #4
Sample #1 Sample #2
Sample #3 Sample #4
P0 = PPO permeabilityα0 = PPO selectivity