The Extraction of Cr(VI) by a Flat Sheet Supported Liquid Membrane Using Alamine 336 as a Carrier

Eyüpoğlu, Volkan; Tutkun, Osman

doi:10.1007/s13369-011-0057-5

Cited by 15 publications

(6 citation statements)

References 20 publications

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“…In highly acidic conditions (at pH < 0.5), chromium is rapidly protonated by hydronium ions and a stable chromic acid H2Cr2O7 is formed. However, the chromic acid formation in the aqueous phase is not the desired situation during the chromium extraction process as the extraction of Cr(VI) ions decreases and thereby the flux and the permeability also decrease [62,63]. Therefore, the solution with pH = 1 was chosen in the present study.…”

Section: Transport Propertiesmentioning

confidence: 99%

Polymer inclusion membranes based on CTA/PBAT blend containing Aliquat 336 as extractant for removal of Cr(VI): Efficiency, stability and selectivity

Sellami

Kebiche-Senhadji

Marais

et al. 2019

Reactive and Functional Polymers

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Cellulose triacetate (CTA) and poly(butylene adipate-co-terephthalate) (PBAT)-based polymer inclusion membranes (PIMs) containing ionic liquid (tricaprylmethylammonium chloride (Aliquat 336)) as the carrier extractant were obtained for the facilitated and selective transport of Cr(VI) ions. The composition of PIMs was optimized in terms of the CTA/PBAT ratio. The obtained membranes were investigated using different techniques in order to show the influence of the membrane composition and the ionic liquid presence on the PIM resulting properties. The infrared analysis confirmed the presence of the intermolecular interactions of the hydroxyl groups of CTA with the carboxyl groups of PBAT and of the negatively charged carboxyl groups of CTA with the positively charged ammonium groups of Aliquat 336. The water contact angle measurements highlighted that the Aliquat 336 and PBAT presence modified the membrane hydrophobic/hydrophilic character. Moreover, it was shown that PIM containing the equivalent content of CTA and PBAT (35/35 wt.%/wt.%) with 30 wt.% of Aliquat 336 revealed the optimized composition and was used for the Cr(VI) ions transport measurements. It was found that this PIM transported more than 99% of Cr(VI) in only 6h and accumulated less than 5% of Cr(VI) ions with a high initial flux. For the first time it is shown that the selective Cr(VI) transport through blend PIM with reduced extractant content and without plasticizer is more efficient compared to common PIMs. Besides, the stability of obtained blend PIMs was confirmed by carrying out continuous transport studies over a long period of time (more than 120h).

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Section: Transport Propertiesmentioning

confidence: 99%

Polymer inclusion membranes based on CTA/PBAT blend containing Aliquat 336 as extractant for removal of Cr(VI): Efficiency, stability and selectivity

Sellami

Kebiche-Senhadji

Marais

et al. 2019

Reactive and Functional Polymers

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“…Under the optimum conditions chromium(VI) recovery from real plating wastewater was tested and found to be satisfactory with a flux value of 1.4 × 10 -3 (mol.cm -2 .s -1 ). Eyupoglu et al [35] have dealt with extraction of Cr(VI) by a flat sheet SLM using Alamine 336 as a carrier and calculated the permeation coefficient as 7.88 × 10 −6 (m.s −1 ). Alguacil et al [36] has studied the transport of chromium(VI) through a Cyanex 923-xylene flat-sheet SLM.…”

Section: Introductionmentioning

confidence: 99%

Performance of sunflower oil as green solvent for Cr(VI) extraction using supported liquid membrane

Mohebali¹,

Nazari²,

Rahbar-Kelishami³

et al. 2017

Desalination and Water Treatment

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a b s t r ac tThis work is an experimental study on the extraction of Cr(VI) ions from aqueous acidic solutions using a flat sheet supported liquid membrane. Sunflower oil used as alternative solvent due to the stricter environmental regulations. Aliquat 336 and NaOH solution were employed as carrier and stripping agent. A hydrophobic microporous polytetrafluoroethylene (PTFE) support was impregnated with liquid membrane consist of solvent and carrier. The Cr(VI) pass through the supported liquid membrane from aqueous feed phase to the stripping phase by means of diffusion. Hydrochloric acid (HCl) was used to regulate the feed phase pH. The efficiency of the extraction was optimized as a function of the various parameters: Feed pH, stripping phase (NaOH) concentration, feed concentration, and carrier concentration. The maximum separation of Cr(VI) was about 95.2% in 10 h. Also, the results of experiments were compared with other organic solvents such as kerosene, n-octanol, dodecane, and tetrahydrofurane (THF) to evaluate the efficiency of sunflower oil. Results indicated that Cr(VI) extraction is on average about 0.5%-55% higher with sunflower oil. The optimum conditions were achieved as: pH = 2, NaOH = 0.1 M, feed concentration = 25 ppm, and Aliquat 336 = 35% v/v. The results indicate that the Cr(VI) ions can be efficiently transported through the SLM by using Aliquat 336 dissolved in sunflower oil as a green solvent.

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“…So, the mildly acidic conditions are handier for these purposes. Taken into consideration of this phenomenon for aqueous species of chromium, chromium‐containing feed phase was adjusted to the mild acidic condition and the stripping phase was adjusted to the necessary requirements to neutralize the protonated imidazolium‐based RTILs like as our previous study .…”

Section: Resultsmentioning

confidence: 99%

The comprehensive investigation of the room temperature ionic liquid additives in PVC based polymer inclusion membrane for Cr(VI) transport

Turgut

Eyüpoğlu

Kumbasar

2018

Vinyl Additive Technology

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This study is to perform the comprehensive investigation of PVC based ionic plasticized membrane (IPM) production by using room temperature ionic liquid (RTIL)‐based additives and the membrane application of selective Cr(VI) removal. Some significant parameters related to membrane structures that are membrane thickness, plasticizer rate, and type, RTILs rate, and type, the average molecular weight of PVC were studied to define the excellent polymeric membrane film composition. After that, the PVC based polymeric film used in the Cr(VI) transport and initial mass transfer coefficient (Jo) were about 3.57 × 10−7 mol s−1 m−2 by decyl substituted RTIL as an additive. Also, optimized membrane transport process has been considered as selective enough for Cr(VI) in the presence of the other heavy metal ions. Surface characterizations of the membranes have been performed to clarify the structural and the morphological assessment of IPMs at initial and end of Cr(VI) transport by SEM‐EDX, AFM, contact angle measurement and found a good relationship between the molecular structure of RTIL additive and membrane morphology. As we know that lots of researchers are still trying to find environmentally friendly, inexpensive and straightforward processes to remove toxic substances from industrial effluents or natural sources. At that point, our results can open a gate for cheap, novel and environmentally friendly Cr(VI) removal by PVC based membrane. J. VINYL ADDIT. TECHNOL., 25:E107–E119, 2019. © 2018 Society of Plastics Engineers

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The Extraction of Cr(VI) by a Flat Sheet Supported Liquid Membrane Using Alamine 336 as a Carrier

Cited by 15 publications

References 20 publications

Polymer inclusion membranes based on CTA/PBAT blend containing Aliquat 336 as extractant for removal of Cr(VI): Efficiency, stability and selectivity

Polymer inclusion membranes based on CTA/PBAT blend containing Aliquat 336 as extractant for removal of Cr(VI): Efficiency, stability and selectivity

Performance of sunflower oil as green solvent for Cr(VI) extraction using supported liquid membrane

The comprehensive investigation of the room temperature ionic liquid additives in PVC based polymer inclusion membrane for Cr(VI) transport

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