Efficient extraction of precious metal ions by a membrane emulsification circulation extractor

He, Kebao; Tang, Jincheng; Weng, Hanqin; Chen, Geng; Wu, Zhihao; Lin, Mingzhang

doi:10.1016/j.seppur.2018.12.024

Cited by 19 publications

(7 citation statements)

References 32 publications

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“…The concentration of the extractant in the organic phase is constant, so the extraction capacity is stationary. As the R A/O increases, the extracted substance in the aqueous phase increases, resulting in a decrease in the extraction rate [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Separation of Palladium from Alkaline Cyanide Solutions through Microemulsion Extraction Using Imidazolium Ionic Liquids

Deng

Liu

et al. 2023

IJMS

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In this paper, three imidazolium-based ionic liquids, viz., 1-butyl-3-undecyl imidazolium bromide ([BUIm]Br), 1-butyl-3-octyl imidazolium bromide ([BOIm]Br), and 1-butyl-3-hexadecyl imidazolium bromide ([BCIm]Br), were synthesized. Three novel microemulsions systems were constructed and then were used to recover Pd (II) from cyanide media. Key extraction parameters such as the concentration of ionic liquids (ILs), equilibration time, phase ratio (RA/O), and pH were evaluated. The [BUIm]Br/n-heptane/n-pentanol/sodium chloride microemulsion system exhibited a higher extraction percentage of Pd (II) than the [BOIm]Br/n-heptane/n-pentanol/sodium chloride and [BCIm]Br/n-heptane/n-pentanol/sodium chloride microemulsion systems. Under the optimal conditions (equilibrium time of 10 min and pH 10), the extraction percentages of these metals were all higher than 98.5% when using the [BUIm]Br/n-heptane/n-pentanol/sodium chloride microemulsion system. Pd(CN)42− was separated through a two-step stripping procedure, in which Fe (III) and Co (III) were first separated using KCl solution, then Pd(CN)42− was stripped using KSCN solution (separation factors of Pd from Fe and Co exceeded 103). After five extraction–recovery experiments, the recovery of Pd (II) through the microemulsion system remained over 90%. The Pd (II) extraction mechanism of the ionic liquid [BUIm]Br was determined to occur via anion exchange, as shown by spectral analysis (UV, FTIR), Job’s method, and DFT calculations. The proposed process has potential applications for the comprehensive treatment of cyanide metallurgical wastewater.

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Section: Resultsmentioning

confidence: 99%

Separation of Palladium from Alkaline Cyanide Solutions through Microemulsion Extraction Using Imidazolium Ionic Liquids

Deng

Liu

et al. 2023

IJMS

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“…The use of ME to achieve the simultaneous droplets generation with chemical/biochemical conversion , or liquid–liquid extractions − is emerging as alternative efficient extraction process. In the present work, in order to extract the compound of interest in the organic phase, the permeate coming from the BMR and containing OA was used as dispersed phase for the production of an unstable water-in-oil emulsion (1/5 v/v).…”

Section: Resultsmentioning

confidence: 99%

Oleuropein Aglycone Production and Formulation by Integrated Membrane Process

Piacentini

Mazzei

Bazzarelli

et al. 2019

Ind. Eng. Chem. Res.

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In this work, for the first time, the integration of a biocatalytic membrane reactor (BMR) and a membrane emulsification (ME) process, has been studied. The production and formulation of an important antioxidant compound (oleuropein aglycone (OA)) has been used as case study. Two different configurations of integrated membrane processes were studied. In the first one, a BMR unit was combined with two ME units (one for extraction of OA and one for its formulation) obtaining OA encapsulation in a hydrophobic matrix based on solid-lipid particles (SLPs). Instead in the other configuration, BMR was combined with one ME unit and OA-loaded poly(vinyl alcohol) (PVA) particles were produced. The noncommercially available OA was produced in the BMR, starting from olive leaves (which contained the substrate of this reaction, oleuropein) with a conversion of 40% at each passage of the substrate through the system. OA encapsulation efficiency (EE) of 90% and 98% was obtained for SLPs and PVA particles, respectively. Energy consumption and environmental impact of the two integrated membrane processes have been also evaluated with the aim to demonstrate the sustainability of MBR/ME integration. The analysis demonstrated that the use of ME instead of conventional methods (for both extraction and/or formulation) allowed decreasing the energy consumption of about 3 orders of magnitude. Water is the most used compound among the raw materials, solvents, and products contributing to process sustainability increase. Thanks to membrane processes versatility, the proposed approach could be easily extended to other applications in which bioconversion and formulation are combined to develop a sustainable and continuous process for the production and formulation of a molecule of interest.

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“…The parameters considered for the study of the membrane stability were the concentration of the internal phase solution (nitric acid) [0.2-0.5] M, the percentage of Span 80 [0.5-3]%wt./wt., the emulsification time [1][2][3][4][5][6][7] min, the volume ratio of the internal phase to the organic phase (membrane) [1/1-2/1], the volume ratio of the emulsion to the external phase [0.05/1-0.5/1], and the stirring speed [100-600] rpm.…”

Section: Study Of Emulsion Stabilitymentioning

confidence: 99%

“…Solvent extraction (SE) has been widely used for heavy metal recovery [1][2][3] from aqueous solutions, particularly the extraction of noble and rare metals by using different extracting solvents. There are several applications of metal solvent extraction in the literature, such as extraction of Ti, Fe, Zn, Cu, Mn, Co, Ni, Li, Sc, Al, Ca, Ta, Nb, and U [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Emulsified liquid membrane (ELM) technology has been introduced through the further development of the liquid membrane method [22]. Li developed the ELM method in 1988; it is a promising technique for water treatment owing to its simplicity, selectivity separation, and high efficiency [2,20,24]. Since then, many papers have been published on the removal, recovery, and purification of numerous organic and inorganic chemicals from aqueous solutions, in addition to biological and medicinal uses.…”

Section: Introductionmentioning

confidence: 99%

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Optimization and Prediction of Stability of Emulsified Liquid Membrane (ELM): Artificial Neural Network

Zamouche¹,

Tahraoui

Laggoun³

et al. 2023

Processes

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In this work, the emulsified liquid membrane (ELM) extraction process was studied as a technique for separating different pollutants from an aqueous solution. The emulsified liquid membrane used consisted of Sorbitan mono-oleate (Span 80) as a surfactant with n-hexane (C6H14) as a diluent; the internal phase used was nitric acid (HNO3). The major constraint in the implementation of the extraction process by an emulsified liquid membrane (ELM) is the stability of the emulsion. However, this study focused first on controlling the stability of the emulsion by optimizing many operational factors, which have a direct impact on the stability of the membrane. Among the important parameters that cause membrane breakage, the surfactant concentration, the emulsification time, and the stirring speed were demonstrated. The optimization results obtained showed that the rupture rate (Tr) decreased until reaching a minimum value of 0.07% at 2% of weight/weight of Span 80 concentration with an emulsification time of 3 min and a stirring speed of 250 rpm. On the other hand, the volume of the inner phase leaking into the outer phase was predicted using an artificial neural network (ANN). The evaluation criteria of the ANN model in terms of statistical coefficient and RMSE error revealed very interesting results and the performance of the model since the statistical coefficients were very high and close to 1 in the four phases (R_training = 0.99724; R_validation = 0.99802; R_test = 0.99852; R_all data = 0.99772), and also, statistical errors of RMSE were minimal (RMSE_training= 0.0378; RMSE_validation = 0.0420; RMSE_test = 0.0509; RMSE_all data = 0.0406).

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Efficient extraction of precious metal ions by a membrane emulsification circulation extractor

Cited by 19 publications

References 32 publications

Separation of Palladium from Alkaline Cyanide Solutions through Microemulsion Extraction Using Imidazolium Ionic Liquids

Separation of Palladium from Alkaline Cyanide Solutions through Microemulsion Extraction Using Imidazolium Ionic Liquids

Oleuropein Aglycone Production and Formulation by Integrated Membrane Process

Optimization and Prediction of Stability of Emulsified Liquid Membrane (ELM): Artificial Neural Network

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