Developments in supported liquid membranes for treatment of metal-bearing wastewater

Su, Goh Saik; Morad, Norhashimah; Ismail, Norli; Rafatullah, Mohd

doi:10.1080/15422119.2020.1828100

Cited by 20 publications

(4 citation statements)

References 109 publications

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“…In the case of solvent extraction, some drawbacks related to this technology, especially the treatment of diluted metal solutions, lead to the development of alternatives to its use, with this being supported by liquid membrane (SLM) separation technology, which is of interest because it combines the kinetics and selectivity of solvent extraction and the simplicity of the membrane diffusion processes. SLMs belong to the advanced variation of extraction operation [ 12 ]. In conventional SLM technology (either in flat-sheet, spiral wound, or hollow fiber modules), the extraction and stripping processes are carried out simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Non-Dispersive Extraction of Chromium(VI) by Cyphos IL102/Solvesso 100 Using the Pseudo-Emulsion-Based Strip Dispersion Membrane Operation

Alguacil

2024

Membranes

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The removal of chromium(VI) from an acidic (HCl) medium through non-dispersive extraction with strip dispersion (NDXSD) was investigated using a microporous PVDF membrane support in a permeation cell. The ionic liquid Cyphos IL102 (phosphonium salt) in Solvesso 100 was used as an organic phase. In NDXSD, the stripping phase (NaOH) is dispersed in the organic phase on the cell side with an impeller stirrer adequate to form a strip dispersion. This pseudo-emulsion phase (organic + strip solutions) provides a constant supply of the Cyphos IL102/Solvesso 100 to the membrane phase. Various hydrodynamic and chemical parameters, such as variation in the feed and pseudo-emulsion stirring speeds, HCl and Cr(VI) concentrations in the feed phase, and carrier concentration, were investigated. Results indicated that the best chromium(VI) transport was obtained under the following conditions: feed and pseudo-emulsion stirring speeds of 1000 min−1 and 600 min−1, respectively; an HCl concentration in the feed phase of 0.1 M; a chromium concentration of 0.01 g/L in the same phase; and carrier concentration in the organic phase in the 2–5–10% v/v range. From the experimental data, several mass transfer coefficients were estimated: a bulk diffusion coefficient of 3.1·10−7 cm2/s and a diffusion coefficient of 6.1·10−8 cm2/s in the membrane phase and mass transfer coefficients in the feed (5.7·10−3 cm/s) and membrane phases (2.9·10−6 cm/s). The performance of the present system against other ionic liquids and the presence of base metals in the feed phase were investigated.

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Section: Introductionmentioning

confidence: 99%

Non-Dispersive Extraction of Chromium(VI) by Cyphos IL102/Solvesso 100 Using the Pseudo-Emulsion-Based Strip Dispersion Membrane Operation

Alguacil

2024

Membranes

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“…[ 30–32 ] However, they require multiple two‐phase extractions and strippings, in which partition coefficients of extracted metals or the capacity of the organic phase become an overall bottleneck, even for high extractant concentrations, 10–30% v/v. Given that optimization of such processes can be at the expense of selectivity and is technically demanding, many efforts strived to combine extraction and stripping into one, continuous process, as in supported liquid membranes (SLM [ 33–39 ] ), bulk liquid membranes (BLM [ 40,41 ] ), or emulsion liquid membranes (ELM [ 33,42,43 ] ). While interesting in concept, these techniques have proven problematic to scale up and have not yet reached commercial maturity, [ 33–35 ] either because of the instability of membranes or double emulsions, or on account of incompatibility with strong stirring, causing collapse of multiphase systems.…”

Section: Introductionmentioning

confidence: 99%

One‐Pot, Three‐Phase Recycling of Metals from Li‐Ion Batteries in Rotating, Concentric‐Liquid Reactors

et al. 2023

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Efficient recycling of spent lithium-ion batteries (LIBs) is essential for making their numerous applications sustainable. Hydrometallurgy-based separation methods are an indispensable part of the recycling process but remain limited by the extraction efficiency and selectivity, and typically require numerous binary liquid-liquid extraction steps in which the capacity of the extracting organic phase or partition coefficient of extracted metals become an overall bottleneck. Herein, rotating reactors are described, in which the aqueous feed, organic extractant, and aqueous acceptor phases are all present in the same rotating vessel and can be vigorously stirred and emulsified without the coalescence of aqueous layers. In this arrangement, the extractant molecules are not equilibrated with the feed and, instead, "shuttle" between the feed/extractant and the extractant/acceptor interfaces multiple times, with each such molecule ultimately transferring approximately ten metal ions. This shuttling allows for using extractant concentrations much lower than in previous designs even for extremely concentrated feeds and, simultaneously, ensures unprecedented speed and selectivity of the one-pot processes. These experimental results are accompanied by theoretical considerations of the selectivity versus speed trends as well as discussion of parameters essential for system upscaling.

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“…Researchers have applied the chemical precipitation, ion exchange, precipitation, adsorption, membrane separation, and reverse osmosis methods for wastewater treatment. In recent years, studies on the separation of heavy metals using supported liquid membranes material have attracted many researchers' interest [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A Natural Zeolite Developed with 3-Aminopropyltriethoxysilane and Adsorption of Cu(II) from Aqueous Media

et al. 2022

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In this work, we removed copper (II) from an aqueous solution by using zeolite modified with a silicon-organic monomer (3-aminopropyltriethoxysilane; APTES) depending on the pH, time, temperature, and initial concentration of Cu(II) ions. To confirm the modification process and assess the interaction between the modified zeolite and Cu(II), we performed instrumental analyses (XRD, SEM/EDX, TGA/DTA, BET, FT-IR, and XPS). We determined the maximum adsorption capacities of the modified zeolite for Cu(II) to be 4.50, 6.244, 6.96, and 20.66 mg/g at T = 25 °C (pH = 5, t = 8 h) when the initial concentrations of Cu(II) were 50, 100, 200, and 400 mg/L, respectively. According to the adsorption thermodynamics and kinetics, the second-order reaction controls the adsorption process. Based on the two isotherm models (Langmuir and Freundlich) with constant values (KL = 0.144, n = 2.764) and the correlation coefficients (R2 = 0.8946, R2 = 0.9216), we concluded that the Cu(II) adsorption onto the modified zeolite could be followed by the Freundlich isotherm model rather than the Langmuir isotherm model. The modified zeolite could be an effective material for the removal of Cu(II) from aqueous solutions.

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Developments in supported liquid membranes for treatment of metal-bearing wastewater

Cited by 20 publications

References 109 publications

Non-Dispersive Extraction of Chromium(VI) by Cyphos IL102/Solvesso 100 Using the Pseudo-Emulsion-Based Strip Dispersion Membrane Operation

Non-Dispersive Extraction of Chromium(VI) by Cyphos IL102/Solvesso 100 Using the Pseudo-Emulsion-Based Strip Dispersion Membrane Operation

One‐Pot, Three‐Phase Recycling of Metals from Li‐Ion Batteries in Rotating, Concentric‐Liquid Reactors

A Natural Zeolite Developed with 3-Aminopropyltriethoxysilane and Adsorption of Cu(II) from Aqueous Media

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