Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural Waters
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 memb...
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doaj-5ded63e4c4ec4ccea169c505c372914f2020-11-25T00:03:22ZengMDPI AGMembranes2077-03752018-09-01848810.3390/membranes8040088membranes8040088Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural WatersClàudia Fontàs0Enriqueta Anticó1Victòria Salvadó2Department of Chemistry, University of Girona, C/Maria Aurèlia Capmany 69, 17003 Girona, SpainDepartment of Chemistry, University of Girona, C/Maria Aurèlia Capmany 69, 17003 Girona, SpainDepartment of Chemistry, University of Girona, C/Maria Aurèlia Capmany 69, 17003 Girona, SpainA 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.http://www.mdpi.com/2077-0375/8/4/88hollow fibersupported liquid membraneD2EHPAzincspeciationnatural waters |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Clàudia Fontàs Enriqueta Anticó Victòria Salvadó |
spellingShingle |
Clàudia Fontàs Enriqueta Anticó Victòria Salvadó Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural Waters Membranes hollow fiber supported liquid membrane D2EHPA zinc speciation natural waters |
author_facet |
Clàudia Fontàs Enriqueta Anticó Victòria Salvadó |
author_sort |
Clàudia Fontàs |
title |
Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural Waters |
title_short |
Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural Waters |
title_full |
Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural Waters |
title_fullStr |
Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural Waters |
title_full_unstemmed |
Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural Waters |
title_sort |
design of a hollow fiber supported liquid membrane system for zn speciation in natural waters |
publisher |
MDPI AG |
series |
Membranes |
issn |
2077-0375 |
publishDate |
2018-09-01 |
description |
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. |
topic |
hollow fiber supported liquid membrane D2EHPA zinc speciation natural waters |
url |
http://www.mdpi.com/2077-0375/8/4/88 |
work_keys_str_mv |
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