Swelling determination of W/O/W emulsion liquid membranes

Wan, Yi-ping

doi:10.1016/s0376-7388(01)00554-3

Cited by 112 publications

(68 citation statements)

References 28 publications

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“…Though, usually lower Vint/Vm leads to a thicker and more stable membrane phase, it was found that too high Vm/Vint also resulted in unstable ELMs (high leakage and swelling). Wang and Zhang [38] reported that Vint/Vm might affect the surfactant concentration at the interface of membrane/aqueous phases and in the bulk membrane phase, and the entrainment and osmotic swelling might increase decreasing Vint/Vm, which resulted in unstable ELMs. Correspondingly, when Vint/Vm varies from 1:2 to 1:1, more than 90% of copper and cyanide removal with ELMs was achieved and lower copper and cyanide removal was observed at both higher and lower Vint/Vm.…”

Section: Influence Of Volume Ratio Of Membrane To Internal Phasesmentioning

confidence: 99%

Copper and Cyanide Extraction with Emulsion Liquid Membrane with LIX 7950 as the Mobile Carrier: Part 1, Emulsion Stability

Chang

Wang

et al. 2015

Metals

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Abstract:The potential use of emulsion liquid membranes (ELMs) with LIX 7950 as the mobile carrier to remove heavy metals from waste cyanide solutions has been proposed. Relatively stable ELMs with reasonable leakage and swelling can be formed under suitable mixing time and speed during emulsification. The concentration of LIX 7950 and Span 80 in the membrane phase, KOH in the internal phase and the volume ratio of membrane to internal phases are also critical to ELM formation. The efficiency of copper and cyanide removal from dilute cyanide solution by ELMs is related to ELM stability to some extent. More than 90% copper and cyanide can be removed from dilute cyanide solutions by ELMs formed under suitable experimental conditions.

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Section: Influence Of Volume Ratio Of Membrane To Internal Phasesmentioning

confidence: 99%

Copper and Cyanide Extraction with Emulsion Liquid Membrane with LIX 7950 as the Mobile Carrier: Part 1, Emulsion Stability

Chang

Wang

et al. 2015

Metals

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“…It reduces the interfacial tension between oil and water by adsorbing at the liquid-liquid interface [8], maintains the emulsion stability and influences the transport rate of metal ions [37,39]. Wan and Zhang [40] revealed that the selection of a surfactant is the key measure to reduce emulsion swelling and membrane breakage. Therefore, the choice and development of a suitable surfactant [41][42][43] and establishment of surfactant concentration correctly will determine the success of ELM process.…”

Section: Effect Of Surfactantmentioning

confidence: 99%

“…Surfactants with a low HLB, typically ranging from 1 to 10, are more soluble in oil than water and tend to make a water-in-oil emulsion while those with a high HLB, typically ranging from 10 to 20, are more soluble in water than oil and tend to make an oil-in-water emulsion [8]. While to get stable emulsion, surfactant with least hydration capacity and low diffusivity due to its high molecular weight is preferable [40]. However, for overall ELM process, too stable emulsions are unfavorable for the difficulty in demulsification process.…”

Section: Effect Of Surfactantmentioning

confidence: 99%

Emulsion liquid membrane for heavy metal removal: An overview on emulsion stabilization and destabilization

Ahmad

Kusumastuti

Chan

et al. 2011

Chemical Engineering Journal

220

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“…This process combines both an extraction and stripping stage to perform a simultaneous purification and concentration. However, this method has been limited by the emulsion instability (Hou and Papadopoulos, 1996;Zihao et al, 1996;Bandyopadhyaya et al, 1998;Xuan-cai and Fu-quan, 1991;Li et al, 1988;Florence and Whitehill, 1981;Wan and Zhang, 2002).…”

Section: Introductionmentioning

confidence: 99%

Inclusion separation of alkali metals in emulsion liquid membranes by nanobaskets of calix[4]crown-3

Bahram

Pourabdollah

2012

Braz. J. Chem. Eng.

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-Nano-assisted inclusion separation of alkali metals from basic solutions was reported by an inclusion-facilitated emulsion liquid membrane process. The novelty of this study is application of nanobaskets of calixcrown in the selective and efficient separation of alkali metals as both the carrier and the surfactant. For this purpose, two diacids, p-tert-butylcalix [4]arene-1,2-crown-3 in the cone and the 1,2-alternate conformation, as well as another diacid, p-tert-butylcalix[4]arene-1,2-thiacrown-3 in the cone conformation, were synthesized. Their inclusion-extraction parameters were optimized, including the calixcrown scaffold (04, 4 wt%) as the carrier/demulsifier, commercial kerosene as the diluent in the membrane, sulphonic acid (0.2 M) and ammonium carbonate (0.4 M) as the strip and the feed phases; the phase and the treat ratios were 0.8 and 0.3, mixing speed (300 rpm), and initial solute concentration (100 mg/L). The selectivity of the membrane was examined for more than ten interfering cations was examined and the results reveled that, under the optimized operating condition, the degree of inclusion-extraction of alkali metals was as high as 98-99%.

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Swelling determination of W/O/W emulsion liquid membranes

Cited by 112 publications

References 28 publications

Copper and Cyanide Extraction with Emulsion Liquid Membrane with LIX 7950 as the Mobile Carrier: Part 1, Emulsion Stability

Copper and Cyanide Extraction with Emulsion Liquid Membrane with LIX 7950 as the Mobile Carrier: Part 1, Emulsion Stability

Emulsion liquid membrane for heavy metal removal: An overview on emulsion stabilization and destabilization

Inclusion separation of alkali metals in emulsion liquid membranes by nanobaskets of calix[4]crown-3

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