Factors influencing transport through liquid membranes and membrane based solvent extraction

Schlosser, Štefan; Sabolová, Erika; Kertész, R.; Kubišová, L'ubica

doi:10.1002/1615-9314(20010801)24:7<509::aid-jssc509>3.0.co;2-r

Cited by 51 publications

(16 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In liquid–liquid extraction systems with flat or hollow fiber microporous membrane and flow of phase(s), the mass transfer coefficient has been frequently used for describing the extraction process . To the best of our knowledge, the mass transfer coefficient in HF‐LPME under unsteady‐state condition and without flow of any phases has not been investigated until now.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…where k D , k M , and k A are the mass transfer coefficient in the donor phase, the organic phase entrapped in the membrane pores, and the acceptor phase, respectively, d i and d o are the inner and outer diameter of a hollow fiber, respectively, d LM is the log mean diameter of a hollow fiber, m D is the partition coefficient between the organic and the aqueous donor phases, m A is the partition coefficient between the organic and the aqueous acceptor phases, and r E and r S are the rate constants of extraction and stripping reaction, respectively. In liquid-liquid extraction systems with flat or hollow fiber microporous membrane and flow of phase(s), the mass transfer coefficient has been frequently used for describing the extraction process [22,28,29]. To the best of our knowledge, the mass transfer coefficient in HF-LPME under unsteady-state condition and without flow of any phases has not been investigated until now.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The mathematical model has been tested under different experimental conditions and using different solutes in the aqueous donor solution such as lutetium(III) and three local anesthetics (bupivacaine, lidocaine, and ropivacaine). The majority of previous investigations of HF‐LPME were directed toward either reaching the highest possible enrichment factor (e.g. the lowest detection limit of a solute) or determining steady‐state conditions for the ESTM.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mass transfer resistance in a liquid‐phase microextraction employing a single hollow fiber under unsteady‐state conditions

Kumrić

Vladisavljević

Đorđević

et al. 2012

J of Separation Science

View full text Add to dashboard Cite

In this study, the mass transport resistance in liquid-phase microextraction (LPME) in a single hollow fiber was investigated. A mathematical model has been developed for the determination of the overall mass transfer coefficient based on the acceptor phase in an unsteady state. The overall mass transfer coefficient in LPME in a single hollow fiber has been estimated from time-dependent concentration of extracted analyte in the acceptor phase while maintaining a constant analyte concentration in the donor phase. It can be achieved either using a high volume of donor to acceptor phase ratio or tuning the extraction conditions to obtain a low-enrichment factor, so that the analyte concentration in the sample is not significantly influenced by the mass transfer. Two extraction systems have been used to test experimentally the developed model: the extraction of Lu(III) from a buffer solution and the extraction of three local anesthetics from a buffer or plasma solution. The mass transfer resistance, defined as a reciprocal values of the mass transfer coefficient, was found to be 1.2 × 10(3) cm(-1) min for Lu(III) under optimal conditions and from 1.96 to 3.3 × 10(3) cm(-1) min for the local anesthetics depending on the acceptor pH and the hydrophobicity of the drug.

show abstract

Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mass transfer resistance in a liquid‐phase microextraction employing a single hollow fiber under unsteady‐state conditions

Kumrić

Vladisavljević

Đorđević

et al. 2012

J of Separation Science

View full text Add to dashboard Cite

show abstract

“…Among the solvents and extractants that have been used for phenol recovery, the groups of solvating extractants have been extensively studied improving the capacity of the organic phase by their reversible complexation with phenol. For instance, the nitrogen‐based extractants20–25 and phosphorous‐based extractants15–18, 21–27 are shown to be excellent phenol extractants due to their high distribution ratios. These solvating agents include Cyanex 92315–18, 23–26–28, a commercial mixture of trioctylphosphine oxides.…”

Section: Introductionmentioning

confidence: 99%

Chirality Amplification of Porphyrin Assemblies Exclusively Constructed from Achiral Porphyrin Derivatives

Chen

Duan

et al. 2006

ChemPhysChem

View full text Add to dashboard Cite

Two achiral porphyrin derivatives, 5,10,15,20-tetrakis(4-methoxyphenyl)-21H,23H-porphine (TPPOMe) and 5,10,15,20-tetrakis(4-hydroxyphenyl)-21H,23H-porphine (TPPOH), were spread onto an air/water interface. The spreading films were transferred onto solid substrates by the Langmuir-Schaefer (LS) method. Although both of the porphyrin derivatives are achiral species, the transferred LS multilayer films shows macroscopic supramolecular chirality, which is suggested to be due to the spontaneous symmetry breaking that occurs at the air/water interface. A strong CD signal is observed from the as-deposited TPPOH LS film, while a relatively weak CD signal is detected from that of TPPOMe. Interestingly, when the TPPOMe LS film was annealed in high vacuum, a significant amplification of the supramolecular chirality is observed. Atomic force microscopy observations confirm that TPPOMe form more ordered aggregates upon annealing. It is suggested that the small amount of chiral assemblies formed in the as-deposited LS film grow into larger ones following the "sergeants and soldiers" principle during the annealing process.

show abstract

“…35 In supported liquid membranes, a microporous membrane is impregnated with an organic solvent and then sandwiched between an aqueous feed and strip solution. 36 The microporous membrane for the SLM can be flat-sheet ( Fig. 2a) or hollow fibers (HFSLM) (Fig.…”

Section: Configurations Of Liquid Membranesmentioning

confidence: 99%

Use of D2EHPA-mediated liquid membranes for heavy metal ions separation: A review

Albaraka¹

2019

Rev.Roum.Chim.

View full text Add to dashboard Cite

The removal and recovery of heavy metal ions by various types of liquid membranes (LMs), coupled with the commercial extractant di-2-ethylhexyl phosphoric acid (D2EHPA) as carrier, have been extensively studied by many researchers. In this paper, the D2EHPA-mediated LM systems used for transport of heavy metal ions are classified, briefly summarized, and reviewed. The effects of the system chemical compositions and the LM configurations on the separation selectivity and the transport efficiency are evaluated. It seems that depending on the way of choosing the chemical composition of the D2EHPA system, the formed LMs can separate selectively one or a mixture of heavy metal ions. Practically, D2EHPA-mediated LMs can be applied in a laboratory-scale as separation and preconcentration step for a heavy metal ion over the detection limits of routine analytical instruments. For large-scale applications on the removal and recovery of the heavy metal ions from waste water or industrial effluents, further modifications and improvements to the existing LM configurations should be developed in order to surmount certain problems such as slow transport rate or reduced stability of some LMs.

show abstract

Factors influencing transport through liquid membranes and membrane based solvent extraction

Cited by 51 publications

References 27 publications

Mass transfer resistance in a liquid‐phase microextraction employing a single hollow fiber under unsteady‐state conditions

Mass transfer resistance in a liquid‐phase microextraction employing a single hollow fiber under unsteady‐state conditions

Chirality Amplification of Porphyrin Assemblies Exclusively Constructed from Achiral Porphyrin Derivatives

Use of D2EHPA-mediated liquid membranes for heavy metal ions separation: A review

Contact Info

Product

Resources

About