The use of micellar-enhanced ultrafiltration (MEUF) for fluoride removal from aqueous solutions

Grzegorzek, Martyna; Majewska-Nowak, Katarzyna

doi:10.1016/j.seppur.2017.11.022

Cited by 39 publications

(16 citation statements)

References 34 publications

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“…2,3 Accordingly, because considerably lower concentrations can be applied, gemini surfactants are proposed to be better for technological and biological purposes such as cosmetics formulations, oil recovery, detergency, nanotechnology, catalysis as well as drug delivery. [4][5][6][7][8][9][10][11][12][13][14][15] The last one, namely, the drug delivery is of special concern. It involves the application of the micellar solutions, vesicles or lyotropic liquid crystals solutions as colloidal drug carrier systems.…”

Section: Introductionmentioning

confidence: 99%

Clear distinction between CAC and CMC revealed by high-resolution NMR diffusometry for a series of bis-imidazolium gemini surfactants in aqueous solutions

et al. 2018

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Section: Introductionmentioning

confidence: 99%

Clear distinction between CAC and CMC revealed by high-resolution NMR diffusometry for a series of bis-imidazolium gemini surfactants in aqueous solutions

et al. 2018

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“…Complete blocking, by definition, results in a reduction in open pores without deposition of foulant particles on the membrane surface. This blocking occurs when the foulant particle size is similar to or larger than the membrane pore size [ 35 ]. As explained above, the addition of saponin above the CMC will generate molecular growth because of micelle formation.…”

Section: Resultsmentioning

confidence: 99%

Micellar-Enhanced Ultrafiltration Using a Plant-Derived Surfactant for Dye Separation in Wastewater Treatment

et al. 2020

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Micellar-enhanced ultrafiltration (MEUF) is one of several membrane methods used for the removal of trace organic pollutants from aqueous streams. In this process, a surfactant is added to a polluted aqueous solution at a concentration higher than its critical micelle concentration (CMC). Unlike synthetic surfactants, natural surfactants, from plants such as the saponin, while ecologically adaptable as surfactants in MEUF systems, are also biodegradable, renewable, and environmentally safe. This study applied Sapindus rarak extract as the natural surfactant in MEUF for Remazol dye separation. It was found that the presence of Sapindus rarak extract increased separation of Remazol red and blue dyes by up to 97.02% and 99.42%, respectively. However, the addition of surfactant decreased permeate fluxes due to membrane fouling and concentration polarization. In addition, loading micelle (Lm), representing the performance of the surfactant micelle for dye separation, as well as the blocking mechanism, was investigated. Lm was found to be in the range of 0.002–0.068 mM dyes/mM saponin. Ultrafiltration blocking mechanisms, as confirmed by the Hermia model, were: standard blocking, for cases without the addition of surfactant; cake formation, for cases with surfactant below the CMC; and complete blocking, for cases with surfactant above the CMC.

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“…It was shown that UF with PES/TiO2 nano-composite membranes had moderate retention of FAC under acidic conditions (pH of 2 to 4), with rejection of about 75.0%. Grzegorzek and Majewska-Nowak [95] applied MEUF for fluoride (F -) removal from aqueous solutions; the results indicated that for a Fconcentration of 10 mg/L, and a high surfactant concentration (3 times the CMC), a Fion concentration in the permeate, below the permissible level for drinking water, could be achieved. The presence of NaCl in the aqueous solution resulted in a significant reduction of Fremoval due to competition from Clfor the micellar surface.…”

Section: Other Anion Removalmentioning

confidence: 99%

Inorganic anion removal using micellar enhanced ultrafiltration (MEUF), modeling anion distribution and suggested improvements of MEUF: A review

Chen

Jafvert

et al. 2020

Chemical Engineering Journal

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Surfactants have been used often in environmental remediation strategies due to their special amphiphilic nature which alters surface and water interfacial properties. When the aqueous concentration of a cationic surfactant far exceeds the critical micelle concentration (CMC), a large concentration of cationic micelles will form in water. These micelles each consist of tens to hundreds of surfactant monomers, and collectively can be utilized as nano-sized ion exchangers to assist with ultrafiltration separation (i.e., removal) of anionic pollutants from natural waters or wastewaters. Target anionic pollutants include nitrate, phosphate, arsenate and chromate. However, most polluted waters contain a complex mixture of anions, with these different anions competing for the micellar pseudo-phase, thus potentially reducing the overall removal efficiency of the target anions.Further, loss of surfactant monomers through the membrane also reduces process efficiency as replenishment of surfactant over time is required. In this review, the existing research on inorganic anion removal by micellar enhanced ultrafiltration (MEUF) and similar processes

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The use of micellar-enhanced ultrafiltration (MEUF) for fluoride removal from aqueous solutions

Cited by 39 publications

References 34 publications

Clear distinction between CAC and CMC revealed by high-resolution NMR diffusometry for a series of bis-imidazolium gemini surfactants in aqueous solutions

Clear distinction between CAC and CMC revealed by high-resolution NMR diffusometry for a series of bis-imidazolium gemini surfactants in aqueous solutions

Micellar-Enhanced Ultrafiltration Using a Plant-Derived Surfactant for Dye Separation in Wastewater Treatment

Inorganic anion removal using micellar enhanced ultrafiltration (MEUF), modeling anion distribution and suggested improvements of MEUF: A review

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