ES_O28
Novel mixed matrix membranes based on functionalised SBA-16 mesoporous oxide
and a block copolymer of styrene and butadiene (SBS)
1
1,2
3
3
Maria Giovanna Buonomenna , Giovanni Golemme , Alfonso Policicchio , Federica Ciuchi ,
3
3
Raffaele Giuseppe Agostino , Alberto Figoli
1
Dipartimento di Ingegneria Chimica e dei Materiali, Università della Calabria, and INSTM
2
Consortium, Rende, Italy, Istituto per la Tecnologia delle Membrane, ITM-CNR, Rende, Italy,
3
Dipartimento di Fisica, Università della Calabria, Rende, Italy
SBA-16 of cubic Im3m symmetry (body-centered cubic structure) was the first welldocumented example of ordered mesoporous silica with cage-like pores of diameter of about
1
5 nm. Each mesopore in the body-centered cubic structure has eight nearest neighbour
mesopores and each mesopore is connected with its eight adjacent pores, forming a tridimensional pore system. In this work, SBA-16 silicas have been synthesised with a wide
range of mesopore cage diameters and entrance sizes by controlling synthesis temperature
and time. The pore entrance size has been modified by introducing stoichiometric quantities
of C10 and C18 alkyl chains. Defect free mixed matrix membranes based on SBS have been
prepared by using these modified SBA-16 silicas. Figure 1 a-b shows the SEM analysis of the
cross sections of SBS mixed matrix membrane based on SBA-16 functionalized with C18
chains.
Figure 1. SEM pictures of the SBS_SBA_16_C18 mixed matrix membrane.
In Figure 2 the O2, He, N2 and CO2 permeability and the CO2/N2 selectivity of the SBS
membranes containing SBA-16 functionalized with C18 and C18/C10 groups
(SBS_SBA_16_C18 and SBS_SBA_16_C18/C10) are reported. The novel mixed matrix
membranes are more permeable than the SBS membrane, with improved CO2/N2 selectivity.
21
700
CO2
SBS
500
SBS
20
SBS_SBA_16_C18
Selectivity (α) CO 2/N 2
Permeability (Barrer)
600
SBS_SBA_16_C18
/C10
400
300
He
SBS_SBA_16_C18
SBS_SBA_16_C18/
C10
19
18
17
200
O2
100
16
N2
15
0
1
1
Figure 2. Gas permeability (left) and CO2/N2 selectivity (right) of SBS and mixed matrix membranes
References
(1) Zhao, D.; Huo, Q.; Feng, J.; Chmelka, B.; Stucky, G. D.; J. Am. Chem. Soc., 1998, 120,
6024.
Acknowledgements
th
This work was supported by the 7 Framework Programme (Project DoubleNanoMem,
NMP3-SL-2009-228631).