Streaming potential measurements as a characterization method for nanofiltration membranes

Peeters, J.M.M.; Mulder, M.H.V.; Strathmann, H.

doi:10.1016/s0927-7757(98)00828-0

Cited by 140 publications

(66 citation statements)

References 23 publications

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“…Compared with the zeta potential measured in pure water which was much smaller for lower conduction in pure water, zeta potential commonly increased with the decrease of concentration [23][24][25] , which meant there was a peak value of zeta potential at a certain concentration between zero and 1 g·L −1 .…”

Section: Zeta Potential Measurement In Electrolytes Solutionsmentioning

confidence: 68%

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Electrokinetic and permeation characterization of hydrolyzed polyacrylonitrile (PAN) hollow fiber ultrafiltration membrane

Bao

Yang

2009

Sci. China Ser. B-Chem.

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PAN membrane and hydrolyzed PAN membranes with the same pore size were used to investigate the relationship between the electrokinetic property and permeation performance by streaming potential measurement and ion exchange technology. SEM and FT-IR/ATR spectra were employed to analyze the reaction and the presence of the amide groups. The thickness of the polyacrylic acid (PAA) layer on the membrane surface measured by ion-exchange titration technology increased with the reaction time, and that on membrane hydrolyzed for 50 min could reach 10.8 nm. Streaming potential measurement was used to study the influence of the carboxylic and nitrile group on the membrane surface on their separation property. Zeta potential measured in pure water had close relationship with the permeation property. This measurement also proved that there was a maximum zeta potential between zero and the concentration tested. For the ionization or dissociation of the carboxylic group on the membrane surface, treated membranes had a more flexible zeta potential range than that of the untreated membrane in the pH range of 3-9. They were all negative in pure water and 1 g·L −1 KCl solution, while the membranes hydrolyzed for 30 min and 50min had IEPs at pH 5.5 and 6.1 in 1 g·L −1 MgCl 2 solution. Special inflection points of all the membranes were observed in AlCl 3 solution for the positive colloid structure of Al(OH) 3 . polyacrylonitrile (PAN), zeta potential, ultrafiltration, hollow fiber membrane

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Section: Zeta Potential Measurement In Electrolytes Solutionsmentioning

confidence: 68%

“…Extensive research [23][24][25] has found that zeta potential of membranes increased with the decrease of electrolytes concentration. According to Helmholtz-Smoluchowski (H-S) equation, streaming potential increased with the decline of electrolyte concentration, while solution conductivity was just the opposite.…”

Section: Introductionmentioning

confidence: 99%

Electrokinetic and permeation characterization of hydrolyzed polyacrylonitrile (PAN) hollow fiber ultrafiltration membrane

Bao

Yang

2009

Sci. China Ser. B-Chem.

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“…The graphs were based on a review of publications and therefore represent the MWCO dependence well. In NF combined charge and size effects are well recognised [5].…”

Section: Introductionmentioning

confidence: 99%

Fouling effects on rejection in the membrane filtration of natural waters

Schäfer¹,

2000

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Membrane processes in drinking water applications are micro-(MF), ultra-(UF), and nanofiltration (NF). These processes remove turbidity and bacteria (MF), viruses and macromolecules (UF) and small molecules and hardness (NF). Of particular concern in water treatment is the removal of natural organic matter (NOM) which contains potential disinfection by-product precursors. The presence of colloids, multivalent ions and organics in surface waters may cause substantial fouling of membranes.A study was carried out which looked at the rejection abilities of a range of membranes targeting hematite colloids (40-500nm), NOM and cations, fouling conditions and cost of treatment of these processes with consideration of chemical pretreatment with ferric chloride [1]. In this paper the effect of membrane fouling on rejection is presented.The study was based on experiments with two MF membranes (GVWP, GVHP, 0.22 µm, Millipore), six UF membranes (1, 3, 5, 10, 30, 100 kDa, regenerated cellulose, Millipore), and four organic nanofiltration (NF) membranes (TFC-SR, TFC-S, TFC-ULP, CA-UF, Fluid Systems, U.S.).Three different types of organics (IHSS humic acid, IHSS fulvic acid and an Australian concentrated NOM) in a carbonate buffer containing calcium chloride and a background electrolyte were used. Experiments were carried out in perspex (MF, UF) and stainless steel (NF) stirred cells of a volume of 110-185 mL and a membrane area of 15.2 -21.2*10 -4 m 2 at transmembrane pressures of 1, 3, and 5 bar for MF, UF, and NF, respectively.UF removes 10 -95% of NOM depending on the molecular weight cut-off (MWCO) of the membrane. Pore sizes of < 6 nm are required to remove about 80% of NOM, where a 6 nm pore size corresponds to a MWCO of about 10 kDa. Colloids are fully rejected.NF removes NOM effectively (70 -95% as dissolved organic carbon (DOC) and 85 -98% as UV absorbance). Cation rejection is very membrane dependent and varies for the investigated membrane types between 13 and 96% for calcium and 10 to 87% for sodium. 1Fouling was also dependent on pore size and was caused by large colloids (250 nm) or coagulant flocs in MF, small colloids, organic-calcium flocs and aggregates with a dense structure (formed slowly) in UF, and by a calcium-organic precipitate in NF. The fouling influenced the rejection of colloids in MF and that of NOM in UF and NF. If a highly charged layer was deposited on the NF membranes, cation rejection was also influenced. The characterisation of permeate organics revealed that low molecular weight acids passed through the NF membranes and that the rejection of these acids was also dependent on the deposit on the membrane.The mechanisms which can explain such an increase in rejection are different for the three membrane processes. In MF, pore plugging and cake formation was found responsible for fouling. This reduces the pore size and increases rejection. In UF, internal pore adsorption of calcium-organic flocs reduces the internal pore diameter and subsequently increases rejection. In NF, the key fact...

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“…The ionic strength of peptides solution affects the selectivity of NF membranes. In an aqueous medium the increase of the ionic strength, for example by the addition of NaCl, results in a decrease of zeta potential of the NF membrane [80][81][82][83] as well as a decrease in the electrophoretic mobility of proteins and peptides [84]. According to these observations, electrostatic interactions between the membrane and the peptides become less intense, which usually leads to better transmission values of the peptides.…”

Section: Main Parameters Influencing Peptide Fractionation Using Nf Mmentioning

confidence: 99%

Advancements in the Fractionation of Milk Biopeptides by Means of Membrane Processes

Muro¹,

Riera²,

Fernández³

2013

Bioactive Food Peptides in Health and Disease

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Streaming potential measurements as a characterization method for nanofiltration membranes

Cited by 140 publications

References 23 publications

Electrokinetic and permeation characterization of hydrolyzed polyacrylonitrile (PAN) hollow fiber ultrafiltration membrane

Electrokinetic and permeation characterization of hydrolyzed polyacrylonitrile (PAN) hollow fiber ultrafiltration membrane

Fouling effects on rejection in the membrane filtration of natural waters

Advancements in the Fractionation of Milk Biopeptides by Means of Membrane Processes

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