Enhanced removal of Cr(VI) by polymer inclusion membrane based on poly(vinylidene fluoride) and Aliquat 336

Sellami, Ferhat; Kebiche-Senhadji, Ounissa; Marais, Stéphane; Colasse, Laurent; Fatyeyeva, Kateryna

doi:10.1016/j.seppur.2020.117038

Cited by 40 publications

(40 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To study the influence of the MMT incorporation on the evolution of the membrane crystallinity, DSC measurements were carried out. The DSC thermograms of the first heating of the studied PIMs are shown in Figure 7 and the obtained thermal characteristics are As expected, the addition of Aliquat 336 changes the PVDF mechanical behavior as significantly higher elongation at break (~350%) is obtained due to the plasticizing effect of Aliquat 336 [20]. Such ductile behavior is also reported for the PVDF membranes doped with other ionic liquids, for example 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [34,55].…”

Section: Membrane Thermal Characterizationsupporting

confidence: 71%

See 1 more Smart Citation

Novel Poly(Vinylidene Fluoride)/Montmorillonite Polymer Inclusion Membrane: Application to Cr(VI) Extraction from Polluted Water

et al. 2021

Self Cite

View full text Add to dashboard Cite

Novel hybrid polymer inclusion membranes (PIMs) based on poly(vinylidene fluoride) (PVDF) (polymer matrix) and Aliquat 336 (ion carrier) and containing native sodium (Cloisite Na+ (CNa)) and organo-modified (Cloisite 30B (C30B)) Montmorillonites were elaborated and tested for the removal of toxic Cr(VI) ions from the aqueous solution. The influence of the nanoclay incorporation on the physicochemical properties of PVDF-based PIMs was studied and the resulting membrane transport properties of the Cr(VI) ions were investigated in detail. The water contact angle measurements reveal that the incorporation of the CNa nanofiller affects the membrane wettability as less hydrophilic surface is obtained in this case—~47° in the presence of CNa as compared with ~15° for PIMs with C30B. The membrane rigidity is found to be dependent on the type and size of the used Montmorillonite. The increase of Young’s modulus is higher when CNa is incorporated in comparison with C30B. The stiffness of the PIM is strongly increased with CNa amount (four times higher with 30 wt %) which is not the case for C30B (only 1.5 times). Higher Cr(VI) permeation flux is obtained for PIMs containing CNa (~2.7 µmol/(m2·s)) owing to their porous structure as compared with membranes loaded with C30B and those without filler (~2 µmol/(m2·s) in both cases). The PIM with 20 wt % of native sodium Montmorillonite revealed satisfactory stability during five cycles of the Cr(VI) transport due to the high membrane rigidity and hydrophobicity. Much lower macromolecular chain mobility in this case allows limiting the carrier loss, thus increasing the membrane stability. On the contrary, a deterioration of the transport performance is recorded for the membrane filled with C30B and that without filler. The obtained results showed the possibility to extend the PIM lifetime through the incorporation of nanoparticles that diminish the carrier loss (Aliquat 336) from the membrane into the aqueous phase by limiting its mobility within the membrane by tortuosity effect and membrane stiffening without losing its permselective properties.

show abstract

Section: Membrane Thermal Characterizationsupporting

confidence: 71%

“…the crystalline phase [20,55]. The incorporation of the ionic liquid leads also to a decrease in the PVDF crystallinity-50% in case of pure PVDF and 38% in case of the 70PVDF/30Aliquat 336 membrane (Table 2).…”

Section: Membrane Thermal Characterizationmentioning

confidence: 98%

Novel Poly(Vinylidene Fluoride)/Montmorillonite Polymer Inclusion Membrane: Application to Cr(VI) Extraction from Polluted Water

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Various methods, e.g., chemical, 6 electrolytic, 7 ion-exchange, 8 membrane separation, 9 biological, 10 and adsorption, 11 are currently used for removal of heavy metals from water. In recent years, membrane separation technology has been used to remove heavy metals.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, membrane separation technology has been used to remove heavy metals. Sellami et al 9 used new polymer inclusion membranes to remove Cr(VI) in aqueous solutions; the results showed that the chromium removal rate reached 97%. However, membrane separation processes are complex, membranes are easily polluted, and maintenance costs are high.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Separation of Cr(VI) from a Water Phase Using Multiwalled Carbon Nanotube-Immobilized Ionic Liquids

Sun

Wang

et al. 2020

ACS Omega

View full text Add to dashboard Cite

Three types of multiwalled carbon nanotubes (MWCNTs, MWCNTs-OH, and MWCNTs-COOH) were used as carriers and five types of ionic liquids (ILs) were immobilized on each carrier by an impregnation method. Boehm titration, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, specific surface area analysis by the Brunauer–Emmett–Teller method, and thermogravimetric analysis were performed to investigate [C4mim]HSO 4 adsorption by the MWCNTs. The MWCNT-immobilized IL was used for Cr(VI) removal from a water phase. The adsorption properties of MWCNTs-COOH-immobilized [C4mim]HSO 4 were investigated by single-factor analysis. The results showed that the Cr(VI) removal rate was 52.14% and the adsorption capacity was 31.29 mg/g. The optimum adsorption conditions were as follows: initial Cr(VI) concentration, 60 mg/L; adsorbent dosage, 50 mg; pH 2.0; adsorption temperature 40 °C; and adsorption time, 200 min. Adsorption isotherm data fitted the Freundlich model, which indicates that the adsorption process was in line with the multimolecular layer adsorption theory. The Cr(VI) adsorption behaviors of the three adsorbents were consistent with a pseudo-second-order dynamic model. Thermodynamic analysis of the reaction systems was also performed. The Cr(VI) removal rates of MWCNTs-3, MWCNTs-OH-3, and MWCNTs-COOH-3 were 27.97, 9.39, and 7.34% lower than the initial removal rates after five cycles.

show abstract

“…4 Methods have been developed for the removal of Cr(VI) from wastewater, including bio-electrochemical, chemical precipitation, membrane separation, electrolysis, and adsorption. [5][6][7][8][9] Among them, adsorption has been studied widely due to its easy operation, low cost, good reusability and excellent recovery efficiency. Traditional adsorbents include bio-adsorbents, magnetic nanocomposites, activated carbons, and chelating resin.…”

Section: Introductionmentioning

confidence: 99%

Ion-imprinted modified molecular sieves show the efficient selective adsorption of chromium(vi) from aqueous solutions

Lǐ

Cheng

2020

RSC Adv.

View full text Add to dashboard Cite

show abstract

Enhanced removal of Cr(VI) by polymer inclusion membrane based on poly(vinylidene fluoride) and Aliquat 336

Cited by 40 publications

References 56 publications

Novel Poly(Vinylidene Fluoride)/Montmorillonite Polymer Inclusion Membrane: Application to Cr(VI) Extraction from Polluted Water

Novel Poly(Vinylidene Fluoride)/Montmorillonite Polymer Inclusion Membrane: Application to Cr(VI) Extraction from Polluted Water

Adsorption Separation of Cr(VI) from a Water Phase Using Multiwalled Carbon Nanotube-Immobilized Ionic Liquids

Ion-imprinted modified molecular sieves show the efficient selective adsorption of chromium(vi) from aqueous solutions

Contact Info

Product

Resources

About