poster_ sadah m. ahmed_gpc
TRANSCRIPT
ABSTRACT Materials & Method
Results & Discussion
Membrane Characterizations Permeation study.
Cross-sectional
Data of PSf and PSf/SPEEK-Pluronic F127 blend membranes
SEM Top Surface .
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flu
x (
L.m
2.h
)
Time (min)
Pure waterPLU-0PLU-1PLU-2PLU-4PLU-5.5
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0 10 20 30 40 50 60 70 80 90 100 110 120
Time (min)
HAc-0.5g/L, TMP-2 bar, Temp-30◦C and
cross flow velocity-1.7 LPM
PLU-0
PLU-1
PLU-2
PLU-4
PLU-5.5
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120
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Flu
x (
L.m
2 h
)
Time (min)
BSA-0.5gm/L, TMP-2 bar, Temp-30◦C, and
cross flow velocity-1.7 LPM
PLU-0
PLU-1
PLU-2
PLU-4
PLU-5.5
Effect of Amphiphilic Pluronic F127 on the Performance of PSf/SPEEK Ultrafiltration Membranes; Antifouling study.
Shivanand B. Teli, Sadah M. Ahmed, and Abdelbaki Benamor ([email protected])
Polysulfone (PSf)/ sulfonated poly (ether ether ketone) (SPEEK) blendmembranes are prepared by phase inversion.
Amphiphilic Pluronic F127 was used as additives varying wt.% like 0, 1, 2,4, and 5,5, with respect to wt.% of polymer.
Fixed amount of SPEEK was used as secondary blend polymer for the sakeof improving the PSf membrane performances.
Permeation performances of the blend membrane were evaluated interms of pure water, humic acid and bovine serum albumin (BSA).
Improved membranes surface hydrophilicity, equilibrium water content,pores size and porosity, morphology and surface roughness were foundaddition of Pluronic F127 over control PSf membrane.
The BSA was used as a model foulant for antifouling study to investigateflux rejection and flux recovery ratio.
The Pluroinc F127 content (5.5wt. %) membrane showed the highest BSArejection along with flux recovery ratio.
Materials: Polysulfone, Self synthesized SPEEK, Pluronic F127 Bovine serumalbumin, Humicacid and Dimethyl actamide solvent (DMAc), Deionized water.
Methods: SPEEK polymer was synthesized by as per literature [1]respectively. Membranes prepared [2], using 16 wt. % of PSf, fixed 3 wt. %of SPEEK, DMAc solvent with varying wt.% of Pluronic F127. Membraneswere labeled as PLU-0, PLU-1, PLU-2, PLU-4, and PLU-5.5, respectively.Control membranes prepared without Pluronic F127 additives.
Experimental Setup:
Membrane area with 42cm2, cross
flow cell
Membrane casting machine. Casting Knife thickness-
200 Micron
Flux:
tA
VJw
.
1001% XC
CR
f
p
V- Wt of permeate , A- membrane area, ∆t-time Cf and Cp represents protein feed and permeate solutions
Acknowledgements: This research finance was supported by an NPRP Grant # 5-1425-2-607 from the Qatar
National Research Fund (a member of Qatar Foundation). References: [1] G. Arthanareeswaran, Appl. Surf. Sci. 253 (2007) 8705-8712.[2] W.R. Bowen, J. Member. Sci. 181 (2001) 253.
Internal Pore structurePore diameter
PLU-0
PLU-2
PLU-4
PLU-5.5
AFMCONCLUSIONS In this work, a fixed amount of hydrophilic SPEEK was used as a secondary blend
polymer with polysulfone to develop UF blend membranes by phase inversion.Equilibrium water content, pore size, porosity and contact angle values confirmed
that the prepared blend membranes are more hydrophilic than control PSfmembranes.
SEM micrographs proved the asymmetric nature of the blend membranes. AFM images revealed that the surface roughness decreases with increasing Pluorinc
F127 additive.Resulting blend membranes exhibited enhanced water, HA and BSA fluxes and better
antifouling properties compared to PSf membrane.
PSf (PLU-0) membrane exhibited large scalesurface roughness and ridge-valley structurewhich might cause more severe flux decline inmembrane.PSf/SPEEK blend membrane had uniformstructure with smooth surfaces (see PLU-2 to PLU-5.5).In addition, 3D images of the membranes clearlyshown that, the blend membranes had smoothersurfaces than PLU-0 membrane.
Fig. a&b PLU-5.5 almost asymmetric nature. The tighter central region -microbial retention capacity,and the coarser outer regionsprovide loading capacity
a
b
Note: PLU-0 surface pores are very small and squeezed the hydrophobic structure of membrane surface. SPEEK addition increases the surface pore sizes and porosity (See Table Above).Control Cross showed short finger-like pores butPSf-SPEEK membranes showed longer finger-likepores (looks like water channels).
The prepared membranes were tested using cross flow cell with pure water withtime intervals, its was found that increasing F-127 and Hydrophilic SPEEK improvedwater flux.
HA results shown that flux decline was very rapid due to its internal poreadsorption, blocking and a development of fouling cake layer on the surface.
BSA permeation is better than HAc solution because of SPEEK and Pluronic F127. The rejection percentage of BSA; increased with increasing Pluronic F127. FRR values are improved due to presence of both hydrophilic polymer and additives.
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PLU-0 PLU-1 PLU-2 PLU-4 PLU-5.5.
(%)
Membranes
Rejection FRR
Contact Number – Dr. Shiva Teli: 33534440/ Dr. A. Benamor: 33921197