An equilibrium model for ligand-modified micellar-enhanced ultrafiltration using a water-insoluble ligand

Dharmawardana, Udeni R.; Christian, Sherril D.; Taylor, Richard W.

doi:10.1021/la00038a016

Cited by 32 publications

(22 citation statements)

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“…The percentage of rejection increased remarkably with increase in the hydrophobic content from AMPS co (11) to AMPS co (30); whereas AMPS co (20) showed the lowest values. Molecular weight of surfactant also plays a key role, i.e., the shorter the chain length, the lower the force needed to go through the membrane.…”

Section: Binding Of Organic Compounds and Metal Ionsmentioning

confidence: 95%

“…20 Therefore, the experiments for removal of pollutants were performed using dialysis cells (6 mL), as ED is a simple experimental method. Each cell consists of two sides covered with regenerated cellulose membranes (CelluSept2 from Spectrapore) with a diameter of 30 mm and a total filter surface area of 707 mm 2 .…”

Section: Synthesis Of Amphiphilic Copolymersmentioning

confidence: 99%

“…Copolymer concentrations were chosen above their corresponding CAC, [AMPS co (11)] 5 1.5 g/L; [AMPS co (20)…”

Section: Synthesis Of Amphiphilic Copolymersmentioning

confidence: 99%

“…This pattern seems very likely in systems where both partners bear opposite charge. On the (18) 0.56 0.50 AMPS co (20) 0.42 0.32 AMPS co (26) 0 (20) 0.32 0.10 -AMPS co (30) 0.25 0.07 -other hand, as the polyelectrolyte contains hydrophobic groups anchored along the backbone, the association with CTAB may arise mainly from hydrophobic interactions. Figure 5 shows the change of fluorescence emission versus the logarithm of the copolymer AMPS co (11) concentration, at a fixed CTAB concentration (0.04 g/L).…”

Section: Microdomain Formation Of Amphiphilic Copolymers Amps Co In Wmentioning

confidence: 99%

“…The experiments were carried out using surfactant concentrations 0.3 g/L higher than CAC, i.e., 1.5 g/L for AMPS co (11) and 0.6 g/L for AMPS co (20) and (30), in the absence and in the presence of NaCl 1M.…”

Section: Binding Of Organic Compounds and Metal Ionsmentioning

confidence: 99%

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Synthesis and association properties in water solution of random copolymers of 2‐acrylamido‐2‐methyl‐1‐propane sulfonic acid and isodecyl methacrylate—potential application as surfactants in micellar‐enhanced ultrafiltration processes

Peinado

Catalina

Miguel

2007

J of Applied Polymer Sci

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: Synthesis and association properties in water solution of random copolymers of 2-acrylamido-2-methyl-1-propane sulfonic acid and isodecyl methacrylate-potential application as surfactants in micellar-enhanced ultrafiltration processes. Fluorescence spectroscopy was used to further confirm the copolymers self-aggregate in water. Critical concentration of the self-aggregate formation (CAC) decreased by increasing the molar fraction of iDMA in the AMPS co copolymers and varied between 1.20 and 0.04 g/L depending on the degree of hydrophobic modification. Hence, copolymer composition and charge density allowed tuning the pseudomicellar characteristics of these new amphiphilic copolymers. The addition of a salt or a low-molecular-weight surfactant was studied. Binding of CTAB to the AMPS co copolymers leads to a high decrease of CAC, i.e., 0.006 g/L. Effect of the composition in the viscosimetric behavior of the hydrophobically modified copolymers AMPS co was investigated. The removal of single metal ions, Cu 21 , and m-cresol from aqueous solutions by ultrafiltration with the help of the copolymers was investigated. Equilibrium dialysis experiments demonstrate that the formation of hydrophobic microdomains can be used to control the sequestration of foulants, and thus these novel copolymers have potential application as polymeric surfactants in micellar-enhanced ultrafiltration processes for water purification. Journal of Applied Polymer

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Section: Binding Of Organic Compounds and Metal Ionsmentioning

confidence: 95%

Section: Synthesis Of Amphiphilic Copolymersmentioning

confidence: 99%

“…Copolymer concentrations were chosen above their corresponding CAC, [AMPS co (11)] 5 1.5 g/L; [AMPS co (20)…”

Section: Synthesis Of Amphiphilic Copolymersmentioning

confidence: 99%

Section: Microdomain Formation Of Amphiphilic Copolymers Amps Co In Wmentioning

confidence: 99%

Section: Binding Of Organic Compounds and Metal Ionsmentioning

confidence: 99%

See 3 more Smart Citations

Synthesis and association properties in water solution of random copolymers of 2‐acrylamido‐2‐methyl‐1‐propane sulfonic acid and isodecyl methacrylate—potential application as surfactants in micellar‐enhanced ultrafiltration processes

Peinado

Catalina

Miguel

2007

J of Applied Polymer Sci

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Separation of amino‐acid enantiomers using micellar‐enhanced ultrafiltration

Creagh

Hasenack

Padt

et al. 1994

Biotech & Bioengineering

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Micellar-enhanced ultrafiltration (MEUF) is investigated as a large-scale technique for separating amino acid enantiomers. Specifically, L-5-cholesterol glutamate, a chiral ligand-exchange cosurfactant, is used together with a nonionic surfactant to form mixed micelles that preferentially bind D-phenylalanine over L-phenylalanine in the presence of copper(II). Operational selectivities as high as 4.2 are obtained. Potentiometric titrations using a water-soluble model compound similar to the chiral cosurfactant indicate that the ternary copper complex with phenylalanine has a stereoselectivity for the D enantiomer which is significantly smaller than that observed in the MEUF system. Thus, the selectivity of the chiral legend's local solvent and structural environment.

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