Hollow‐fiber dispersion‐free extraction and stripping of Pb(II) in the presence of Cd(II) using D2EHPA under recirculating operation mode

Escobar, Armando; Schimmel, Keith; Gyves, Josefina de; Miguel, Eduardo Rodríguez de San

doi:10.1002/jctb.1004

Cited by 13 publications

(4 citation statements)

References 27 publications

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“…Yet it presents many difficulties, such as the requirement of a huge inventory of expensive extractant, large plant size to obtain the desired separation, operational difficulties like solvent loss due to crud formation or the entrainment of the organic phase into the aqueous solution, or by volatilization of diluent and degradation of the organic extractants. 4 Membrane-based solvent extraction processes have been shown to be an effective alternative to the metal removal techniques mentioned above, including solid-supported liquid membranes [5][6][7][8] and surfactant liquid membranes. 9,10 Particularly, a surfactant liquid membrane process has sufficient ability to selectively separate metals from aqueous solutions using a double W/O/W emulsion stabilized by the use of suitable surfactants, with a reduced amount of organic solvent and greater extraction.…”

Section: Introductionmentioning

confidence: 99%

Extraction of cadmium from aqueous solutions by emulsion liquid membranes using a stirred transfer cell contactor

Basualto¹,

Poblete²,

Marchese³

et al. 2006

J. Braz. Chem. Soc.

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Foi estudada a extração de íons cádmio(II) a partir de soluções aquosas ácidas, usando, em uma cela de transferência sob agitação, uma membrana líquida em emulsão, (MLE) preparada pela mistura de querosene com D2EHPA (um ácido alquilfosfórico) como carregador móvel e Span-80 como surfactante. A membrana MLE permitiu transporte eficiente do metal, da solução de alimentação para o extrato de coleta em experimentos realizados a 25 ºC. As variáveis significativas no transporte de cádmio através da membrana foram a concentração do extrator e a quantidade de metal na solução alimentadora. A concentração de HCl como agente de coleta afetou somente a taxa inicial de extração do metal, mas não a extensão da extração. A quantidade de surfactante usada neste estudo estabilizou a membrana adequadamente, mas o uso de uma quantidade maior produziu uma menor taxa de extração inicial devido à resistência inferfacial mais alta. Os resultados experimentais sugerem a possibilidade de recuperação ou remoção de metais tóxicos de soluções aquosas diluídas em um extrator baseado em membranas líquidas emulsificadas.It is studied the extraction of cadmium(II) ions from acidic aqueous solutions using a stirred transfer cell-type emulsion liquid membrane (ELM) prepared by dissolving in kerosene, with D2EHPA (an alkylphosphoric acid) as mobile carrier and Span-80 as surfactant. The ELM allowed efficient metal transport from the feed solution to the stripping liquor in experiments carried out at 25 ºC. The significant variables on cadmium transport through the membrane were extractant concentration and metal content in the feed metal-donor solution. Concentration of HCl as stripping agent affected only the initial metal extraction rate but not the extraction extent. The surfactant content used in this study stabilized the membrane adequately, but the use of a higher content produced a smaller initial extraction rate due to higher interfacial resistance. The experimental results suggest the possibility of recovering or removing valuable or toxic metals from dilute aqueous solution in an extractor based on emulsified liquid membranes.

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Section: Introductionmentioning

confidence: 99%

Extraction of cadmium from aqueous solutions by emulsion liquid membranes using a stirred transfer cell contactor

Basualto¹,

Poblete²,

Marchese³

et al. 2006

J. Braz. Chem. Soc.

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“…It is known that D2EHPA readily extracts Fe(III) from aqueous solutions [50], and it can also be used for the removal of Pb under a suitable pH range [51]. For that reason, for the recovery of Zn in the third and final stage, two approaches were investigated.…”

Section: Proposed Multi-stage Recovery Processmentioning

confidence: 99%

Removal of Base Metals from Mine Tailings in Chloride- and Seawater-Based Media Followed by Solvent Extraction

Azevedo Schueler,

Fernandes de Aguiar,

Yagmurlu

et al. 2023

Sustainability

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The high volume of mine tailings generated during mining activities poses significant worldwide storage risks. However, these tailings often contain valuable metals that can be recovered. Therefore, reprocessing mine tailings has emerged as a crucial strategy to assess secondary metals resources and mitigate storage risks. Furthermore, the mining industry’s extensive use of freshwater necessitates exploring alternative water sources. In this study, the leaching of base metals from mine tailings in chloride-based media was investigated. Approximately 52% Cu, 73% Zn, and 100% Pb were leached from the sample in the presence of HCl and NaCl. The substitution of freshwater with seawater yielded comparable results, demonstrating the potential of seawater as an alternative freshwater source that does not compromise leaching effectiveness. Additionally, 77% of Pb precipitated as PbSO4 from the pregnant leach solution. Through solvent extraction, approximately 100% Cu was recovered using LIX 984 as an extractant, and 71% Zn with D2EHPA. The use of Fe0 significantly reduced the co-extraction of Fe in the Zn recovery step. Overall, this study provides a potential route for reprocessing mine tailings, ensuring maximum leaching and efficient recovery of metals from sulfide mine tailings.

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“…A typical SLM consists of microporous hydrophobic solid support impregnated with an organic carrier. Escobar et al (2004) have studied the influence of composition of feed solution, stripping phase and hollow fibber supported LM on transport of Pb(II) in the presence of Cd(II) ions using D2EHPA as an ion carrier. Minhas et al (2010) have investigated the extraction of Pb(II) through bulk liquid membrane (BLM) containing calix[6]arene hexaester as a metal ion carrier.…”

Section: Introductionmentioning

confidence: 99%

“…The transport selectivity order for PIMS was found as Pb(II) > Zn > Cd(II). Escobar et al (2004) have studied the influence of composition of feed solution, stripping phase and hollow fibber supported LM on transport of Pb(II) in the presence of Cd(II) ions using D2EHPA as an ion carrier. The extraction yield was found to be 97% at optimum experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Coupled transport of Pb²⁺ through tri‐n‐octylamine‐xylene‐polypropylene supported liquid membranes

2012

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Transport of Pb 2+ was carried from acidic solution into alkaline stripping phase through tri-n-octylamine-xylene-polypropylene supported liquid membrane. The transport of Pb 2+ through the membrane was studied by varying the concentration of Pb 2+ and HNO 3 in feed solution, NaOH concentration in strip solution and TOA concentration in membrane phase. The flux data obtained has been used to study the stoichiometry of complex Pb(NO 3 ) n+2 (HNR 3 ) n . The supported liquid membrane (SLM) has been found stable for 10 runs with 24 h between each run. This SLM has been used effectively to extract lead ions along with chromium, copper and zinc ions from aqueous acidic leached solution of paint and industrial effluents.

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Hollow‐fiber dispersion‐free extraction and stripping of Pb(II) in the presence of Cd(II) using D2EHPA under recirculating operation mode

Cited by 13 publications

References 27 publications

Extraction of cadmium from aqueous solutions by emulsion liquid membranes using a stirred transfer cell contactor

Extraction of cadmium from aqueous solutions by emulsion liquid membranes using a stirred transfer cell contactor

Removal of Base Metals from Mine Tailings in Chloride- and Seawater-Based Media Followed by Solvent Extraction

Coupled transport of Pb²⁺ through tri‐n‐octylamine‐xylene‐polypropylene supported liquid membranes

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Hollow‐fiber dispersion‐free extraction and stripping of Pb(II) in the presence of Cd(II) using D2EHPA under recirculating operation mode

Cited by 13 publications

References 27 publications

Extraction of cadmium from aqueous solutions by emulsion liquid membranes using a stirred transfer cell contactor

Extraction of cadmium from aqueous solutions by emulsion liquid membranes using a stirred transfer cell contactor

Removal of Base Metals from Mine Tailings in Chloride- and Seawater-Based Media Followed by Solvent Extraction

Coupled transport of Pb2+ through tri‐n‐octylamine‐xylene‐polypropylene supported liquid membranes

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Coupled transport of Pb²⁺ through tri‐n‐octylamine‐xylene‐polypropylene supported liquid membranes