Thermodynamic parameters and isotherm application on enantiomeric separation of levofloxacin using hollow fiber supported liquid membrane system

2018 ◽  
Vol 195 ◽  
pp. 377-387 ◽  
Author(s):  
Niti Sunsandee ◽  
Suphot Phatanasri ◽  
Prakorn Ramakul ◽  
Ura Pancharoen
Keyword(s):  
Thermodynamic Parameters ◽  
Hollow Fiber ◽  
Liquid Membrane ◽  
Membrane System ◽  
Enantiomeric Separation ◽  
Supported Liquid Membrane

scholarly journals Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural Waters

Membranes ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 88 ◽  
Author(s):  
Clàudia Fontàs ◽  
Enriqueta Anticó ◽  
Victòria Salvadó
Keyword(s):  
Hollow Fiber ◽  
Natural Waters ◽  
Liquid Membrane ◽  
Membrane System ◽  
Mining Area ◽  
Enrichment Factors ◽  
Supported Liquid Membrane ◽  
Analytical Determination ◽  
Fiber System ◽  
Hno3 Solution

A supported liquid membrane-hollow fiber system (HFSLM) has been developed to determine zinc speciation in aquatic environments. The liquid membrane consisted of an organic solution of bis-(2-ethylhexyl)phosphoric acid (D2EHPA) impregnated in the microporous of a polypropylene hollow fiber. The membrane contacted both the donor solution, that contained the metal and the stripping solution, placed in the lumen of the hollow fiber, where the metal was preconcentrated. Different parameters affecting the Zn2+ transport efficiency have been evaluated such as the composition of both the donor and stripping solutions as well as the membrane phase. Extraction and transport efficiencies of free Zn(II) higher than 90% were obtained with a liquid membrane consisting of a 0.1 M D2EHPA solution in dodecane and a 0.1 M HNO3 solution as the stripping phase. The developed HFSLM was used to study the effect of different ligands (EDTA and citric acid) in the donor phase of Zn(II) transport and to investigate the selectivity of the membrane towards Zn when other metals were also present. Finally, the HFSLM system was successfully applied to estimate the free Zn(II) concentrations in three water samples from a mining area. Moreover, the HFSLM system facilitates the analytical determination of trace Zn(II) levels allowing the achievement of enrichment factors of around 700 in the stripping phase.

Efficient hollow fiber supported liquid membrane system for the removal and preconcentration of Cr(VI) at trace levels

2008 ◽  
Vol 62 (2) ◽  
pp. 389-393 ◽  
Author(s):  
Raquel Güell ◽  
Enriqueta Anticó ◽  
Victòria Salvadó ◽  
Clàudia Fontàs
Keyword(s):  
Hollow Fiber ◽  
Liquid Membrane ◽  
Membrane System ◽  
Supported Liquid Membrane

scholarly journals Copper recovery in a bench-scale carrier facilitated tubular supported liquid membrane system

2010 ◽  
Vol 46 (1) ◽  
pp. 67-73 ◽  
Author(s):  
S. Makaka ◽  
M. Aziz ◽  
A. Nesbitt
Keyword(s):  
Sherwood Number ◽  
Liquid Membrane ◽  
Copper Ions ◽  
Membrane System ◽  
Copper Recovery ◽  
Supported Liquid Membrane ◽  
Shell Side ◽  
Copper Solution ◽  
Mobile Carrier ◽  
Double Pipe

The extraction of copper ions in a tubular supported liquid membrane using LIX 984NC as a mobile carrier was studied, evaluating the effect of the feed characteristics (flowrate, density, viscosity) on the feedside laminar layer of the membrane. A vertical countercurrent, double pipe perspex benchscale reactor consisting of a single hydrophobic PVDF tubular membrane mounted inside was used in all test work. The membrane was impregnated with LIX 984NC and became the support for this organic transport medium. Dilute Copper solution passed through the centre pipe and sulphuric acid as strippant passed through the shell side. Copper was successfully transported from the feedside to the stripside and from the data obtained, a relationship between Schmidt, Reynolds and Sherwood number was achieved of.

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