Experimental study of the effects of hypochlorite on polysulfone membrane properties

2006 ◽  
Vol 277 (1-2) ◽  
pp. 137-147 ◽  
Author(s):  
S ROUAIX ◽  
C CAUSSERAND ◽  
P AIMAR
Keyword(s):  
Experimental Study ◽  
Membrane Properties ◽  
Polysulfone Membrane

Proton Exchange Membrane Development and Processing for Fuel Cell Application

2007 ◽  
Vol 539-543 ◽  
pp. 1327-1331
Author(s):  
Philippe Bébin ◽  
Hervé Galiano
Keyword(s):  
Fuel Cell ◽  
Proton Conductivity ◽  
Proton Conduction ◽  
Proton Exchange ◽  
Membrane Properties ◽  
Organic Polymer ◽  
Polysulfone Membrane ◽  
Sulfonated Polysulfone ◽  
Membrane Processing ◽  
Conductive Fillers

The development of new proton exchange membranes for PEMFC has to be related to the membrane processing as it can change drastically the final properties of the material. Indeed, for the same material, a membrane prepared by a solvent-casting process has a lower lifetime than an extruded one. The proton conduction of the membrane can also be dependent on the membrane processing, especially when some removable plasticizers are used to perform the membrane extrusion. Some residual porosity, left in the material after removing the plasticizer, is suspected to enhance the proton conduction of the film. Fuel cell experiments have shown that extruded sulfonated polysulfone membrane can give the same performance as a Nafion® reference membrane whereas the proton conductivity of PSUs is twenty times lower than the Nafion® one. Additional improvements of the membrane properties can also be expected by adding some proton conductive fillers to the organic polymer. This approach enhances the proton conductivity of sulfonated polysulfone to values similar to Nafion®. On the other hand, when Nafion® is used as a matrix for the proton conductive fillers, a very significant improvement of fuel cell performance is obtained.

scholarly journals Filterability of Polysulfone Membrane in a Tilted Panel System for Activated Sludge Filtration

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3533
Author(s):  
Ahmad Aliyan Alif Ismail ◽  
Sri Mulyati ◽  
Sri Aprilia ◽  
Mohd Hizami Mohd Yusoff ◽  
Normi Izati Mat Nawi ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Pore Size ◽  
Membrane Fouling ◽  
Aeration Rate ◽  
Membrane Properties ◽  
Mean Flow ◽  
Clear Trend ◽  
Polysulfone Membrane ◽  
Tilting Angle ◽  
Filtration System

Membrane bioreactors (MBRs) are established technology for treatment of domestic and industrial wastewater because they offer a small footprint and high quality of effluent, in addition to lower excess sludge. However, their widespread applications are still limited by higher expenditure for compensating for membrane fouling. In this study, polysulfone (PSF)-based ultrafiltration membranes were developed and integrated with a tilted panel system for fouling control in activated sludge filtration. The results show an enhanced performance of filtration system thanks to the mutual advantage of the tilted panel system and the membrane properties. Both membranes showed a clear trend of higher permeability with respect to the tilted panel parameters, namely, higher tilting angle, higher aeration rate, and shorter intermittent/switching period. PSF-1 (1 wt% polyethylene glycol (PEG) additive) shows significantly better performance than PSF-3 (3 wt% PEG additive) although their mean flow pore size, structural properties, and contact angle do not differ significantly. PSF-1 shows superior filterability performance of about 45% for panel tilting angles of 20° at an aeration rate of 1.8 L·min−1, and 11% for a switching period of 1 min compared with PSF-3. The key property enhancing the performance of the PSF-1 is its narrower distribution of pore size. Overall results suggest that an optimum system could be achieved by optimizing both the filtration system and the membrane material properties.

Polysulfone Activated Carbon Composite Membranes

2010 ◽  
Vol 660-661 ◽  
pp. 1081-1086 ◽  
Author(s):  
Priscila Anadão ◽  
Laís Fumie Sato ◽  
Hélio Wiebeck ◽  
Francisco Rolando Valenzuela-Díaz
Keyword(s):  
Activated Carbon ◽  
Membrane Surface ◽  
Composite Membranes ◽  
Carbon Composite ◽  
Van Der Waals Interactions ◽  
Membrane Properties ◽  
Mechanical Resistance ◽  
Scanning Electron Micrographs ◽  
Polysulfone Membrane ◽  
Hydrophilic Material

The addition of a fourth component in the system composed by polymer/ solvent/ non-solvent is a technique generally employed to enhance membrane properties. Since polysulfone presents low hydrophilicity, which can hamper filtration performance, the addition of a hydrophilic material can be an important technique to improve this property. Therefore, the main purpose of this work is to understand the influence of addition of the activated carbon in the system polysulfone/ NMP/ water in terms of membrane morphology, hydrophilicity, thermal and mechanical resistance. From scanning electron micrographs, it could be seen that membrane surface became denser with the addition of higher activated carbon contents and the cross-section morphology was not changed. Acid-base interactions were favored with the activated carbon addition and the availability of Lifshtiz-van Der Waals interactions was decreased, being these two properties very important to avoid fouling formation onto membrane surface. The glass transition temperatures of the polysulfone composite membranes with higher activated carbon contents were increased. However, all activated carbon contents brittled the composite membranes in relation to the pristine polysulfone membrane.

Utilization of Smartphone Light Sensors as Light Transmission Analyzer During the Obtaining of Polymeric Phase Inversion Membranes

2020 ◽  
Vol 43 (3) ◽  
pp. 5-9
Author(s):  
Ștefan PINTILIE ◽  
◽  
Geanina Laurenția PINTILIE ◽  
Ștefan BALTĂ ◽  
◽  
...  
Keyword(s):  
Phase Inversion ◽  
Light Transmission ◽  
Pure Water ◽  
Light Transmittance ◽  
Membrane Properties ◽  
Water And Wastewater Treatment ◽  
Sem Images ◽  
Cross Sectional ◽  
Polysulfone Membrane ◽  
Best Available Technologies

Smartphone sensors are gaining research interest due to continuous sensor upgrades, leading to more precise readings of these sensors. For this study, the light sensor of a smartphone was used in determining light transmittance during the phase inversion process of ultrafiltration polysulfone - membrane manufacturing. Membrane separation is one of the best available technologies when it comes to water and wastewater treatment. The purpose of this study was to correlate light transmit tance, at certain demixing steps during phase inversion, with membrane porosity, pure water flux and cross - sectional SEM images. Results show close relation between light transmittance and the mentioned membrane properties.

scholarly journals Influence of ZnO Nanoparticle Size and Concentration on the Polysulfone Membrane Performance

2017 ◽  
Vol 54 (2) ◽  
pp. 257-261 ◽  
Author(s):  
Stefan Catalin Pintilie ◽  
Laurentia Geanina Tiron ◽  
Iulian Gabriel Birsan ◽  
Daniel Ganea ◽  
Stefan Balta
Keyword(s):  
Zinc Oxide ◽  
Membrane Filtration ◽  
High Efficiency ◽  
Composite Membranes ◽  
Nanoparticle Size ◽  
Membrane Properties ◽  
Zno Nanoparticle ◽  
Polysulfone Membrane ◽  
Membrane Performance ◽  
Membrane Matrix

The activity of using membrane technology has developed fast in the treatment of wastewater, drinking water and process water production. The main challenges in membrane filtration are fouling reduction, permeability increase and high efficiency in retention. The best example of membrane enhancement is increasing hydrophilicity. Nanoparticles have been proven that their presence in the membrane matrix increases the water affinity significantly. Although the zinc oxide nanoparticles have a positive effect over the membrane performance, the influence of zinc oxide (ZnO) nanoparticle size has not been studied enough. Two sizes of nanoparticle of ZnO and three concentrations were used for the preparation of composite polysulfone ultrafiltration membranes. The effects of the ZnO nanoparticles in the membrane matrix on the permeation properties, flux stability and retention were tested. SEM, EDX, porosity and contact angle measurement were conducted in this article, also. The experimental results indicated that ZnO-PSf composite membranes exhibits significant differences in the membrane properties due to nanoparticle addition and regardless of their size it leads to an increase in hydrophilicity, flux, permeability, retention and porosity. Decreasing the nanoparticle size leads to an increase in membrane performance.

scholarly journals Experimental Study of CO2 Plasticization in Polysulfone Membrane for Biogas Processing

2019 ◽  
Author(s):  
Serene Sow Mun Lock ◽  
Kok Keong Lau ◽  
Azmi Mohd Shariff ◽  
Yin Fong Yeong ◽  
Norwahyu Jusoh
Keyword(s):  
Experimental Study ◽  
Polysulfone Membrane

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

An Experimental Study of Some Properties of Stuttered Words

1962 ◽  
Vol 5 (4) ◽  
pp. 387-394 ◽  
Author(s):  
Bruce Quarrington ◽  
Jerome Conway ◽  
Nathan Siegel
Keyword(s):  
Experimental Study
Sign in / Sign up

Export Citation Format

Share Document