Preparation and Characterization of Low MWCO PES/SPSF Blend Ultrafiltration Membrane
0
Citation
4
Reference
10
Related Paper
Abstract:
The polyethersulfone/sulfonated polysolfone (PES/SPSF) blend ultrafiltration (UF) membranes with excellent performance were prepared by immersion phase inversion technique. The effects of degree of sulfonation (DS) of SPSF, PES/SPSF ratio, temperature of coagulation bath on the membrane porosity, pure water flux and rejection of PEG were investigated. The results show that the membrane performance with low molecular weight cut-off (MWCO) is excellent when the SPSF with 30% DS is added and the blending ratio of PES/SPSF is 4/1. The temperature of coagulation bath affects the structure of the membrane.Keywords:
Ultrafiltration (renal)
Phase inversion
Ultrafiltration (renal)
Phase inversion
Membrane Technology
Cite
Citations (0)
Positively charged tubular membranes were prepared from cross linked PDM/PAN blend through phase inversion. The tubular membranes made by this material is useful on ultrafiltration cathodal electro -phonetic paint. The retention rate of the membranes is 96%, the water flux is 30 L/m2·h.
Phase inversion
Ultrafiltration (renal)
Cite
Citations (0)
PAN support membranes were prepared by wet phase-inversion method, and the membranes were modified in order to make the nitrile group hydrolyze into the carboxyl group. To compare the performances of the membranes before and after modifying, the membrane morphology was observed by means of environmental scanning electric microscopy (ESEM) and hydrophilicity was studied by the determination of contact angle of the membranes. Additionally, the membranes were investigated by the help of infrared spectrum (FTIR). The result showed that the modified membranes were more hydrophilic than the unmodified membranes due to the carboxyl groups on the former and the performances of the former were better than the latter.
Phase inversion
Nanofiltration
Cite
Citations (0)
A series of cellulose acetate (CA) ultrafiltration membrane blended with poly(acrylic acid) (PAA) and iron oxide (Fe2O3) was prepared by phase inversion technique. Fe2O3 was varied from 0-3 wt% in the casting solution composition to study its effect on the blend membranes. Prepared membranes were analyzed for their morphology, ultrafiltration (UF) features and dye rejection performance. Surface pore studies revealed the increase in the number of pores as well as pore size due to the addition of Fe2O3 to CA. Surface roughness was increased drastically for high concentration Fe2O3 composite membranes. Surface hydrophilicity was improved due to the addition of Fe2O3 in the composite membranes. Porosity measurements confirmed the enhanced porous nature of CA/PAA/Fe2O3 blend membranes than the pristine PES membrane. Pure water flux of the Fe2O3 composite membranes was improved to a maximum of four times as compared with pure PES membrane. Dye rejection studies revealed that the blend membranes had almost the same rejection as that of the pristine membrane with a largely enhanced flux rate. Results obtained clearly indicated the better performance of 1 wt% Fe2O3 blend membrane among the synthesized UF membranes.
Phase inversion
Ultrafiltration (renal)
Cellulose acetate
Cite
Citations (10)
ABSTRACT Highly porous macrovoid‐free polyethersulfone membranes have been prepared using the phase‐inversion process with water as the non‐solvent. These membranes are of great interest for membrane distillation (MD) after application of a hydrophobic/oleophobic coating. The membrane structure was controlled by optimizing the process conditions and dope composition. Counter intuitively, increasing the polymer concentration favors the formation of larger surface pores under similar process conditions. A symmetric membrane is obtained when a sufficient amount of high‐molecular‐weight polyvinylpyrrolidone was added to the dope solution, which appears to play an important role in the structure formation process. The final membrane shows similar performance compared to commercial MD membranes. However, the membranes developed in this study show an oleophobic character, broadening the applications of MD. Moreover, the compressibility of these membranes is severely reduced compared to stretched membranes, which is expected to result in an improved MD performance at full scale. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45516.
Phase inversion
Membrane Distillation
Polyvinylpyrrolidone
Synthetic membrane
Cite
Citations (19)
We have concentrated plasma coagulation factors by a process of ultrafiltration (UF) using a hollow fiber artificial kidney with applied negative pressure. The coagulation factors were concentrated by between 2.4 and 3.2 times, resulting in yields of 82-100%. There was no evidence of activation of coagulation factors as shown by approximately equal increases in the concentrations of all three moieties of factor VIII following ultrafiltration, and by the fact that plasma recalcification times post-UF were not increased. It is suggested that the concentrated plasma product from UF may be useful in replacement therapy.
Ultrafiltration (renal)
Artificial kidney
Cite
Citations (3)
Experiment was made on the humic acid removal and the membrane fouling by means of ultrafiltration with and without coagulation pretreatment. The results show that use of coagulation ahead of ultrafiltration for pretreatment of humic acid results in a rise in removal rate of DOC and UV 254 from 28% and 40% to 53% and 78% respectively. In the meantime, it is shown by high performance liquid chromatographic (HPLC) analysis that the coagulation - ultrafiltration process has significant improvement of removal rate of organic matters with molecular weight 6 000 u. The optimal pH value for coagulation - ultrafiltration process is 7, and sweeping coagulation can make small molecular organic matter agglomerated into micro flocs, which results in the reduction of membrane pore fouling and makes the ultrafiltration kept at high permeation flux.
Ultrafiltration (renal)
Membrane Fouling
Cite
Citations (1)
Nanofiltration
Ultrafiltration (renal)
Nanoporous
Membrane Technology
Cite
Citations (21)
Biofouling
Phase inversion
Filtration (mathematics)
Interfacial polymerization
Polymeric membrane
Cite
Citations (0)
Modern ultrafiltration requires novel perfect membranes with narrow pore size, high porosity, and minimal pore tortuosity to achieve high separation performance. In this work, copolyamic acid (co-PAA) was synthesized and used for the preparation of asymmetric porous membranes by phase inversion technique. Several co-PAA membranes were heated up to 250 °C; during heating, they undergo solid-phase transformation into co-polybenzoxazinoneimide (co-PBOI) via dehydration and cyclization. Comparative characterization of both co-PAA and co-PBOI membranes was realized by scanning electron microscopy, mechanical testing, thermogravimetric analysis, and ultrafiltration experiments. Membrane calibration was carried out using a mixture of seven proteins with different molecular weights. During heat treatment, the molecular weight cut-off of the membranes decreased from 20 × 103 g/mol (co-PAA) to 3 × 103 g/mol (co-PBOI). Abnormally low dispersions of rejection (0.3 for co-PAA and 0.45 for co-PBOI) were observed for the studied membranes; this fact indicates that the membranes possess enhanced resolving power.
Phase inversion
Ultrafiltration (renal)
Thermogravimetric analysis
Characterization
Cite
Citations (8)