Ion foam flotation of neodymium: From speciation to extraction

Micheau, Cyril; Diat, Olivier; Bauduin, Pierre

doi:10.1016/j.molliq.2018.01.022

Cited by 27 publications

(15 citation statements)

References 35 publications

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“…Different from biochemical aspects, the interaction of trivalent ions with proteins and surfactants has gained considerable attention in the case of protein crystallization − but also for sensing purposes that are able to detect trace amounts of rare earth elements or for ion flotation. , Efficient binding of, e.g., Nd 3+ or La 3+ ions to interface-adsorbed proteins in foams and emulsions is also interesting for ion extraction from liquids and may evolve as an important strategy to recycle rare earth elements. − …”

Section: Introductionmentioning

confidence: 99%

Specific Ion Effects of Trivalent Cations on the Structure and Charging State of β-Lactoglobulin Adsorption Layers

2019

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Properties of proteins at interfaces are important to a many processes as well as in soft matter materials such as aqueous foam. Particularly, the protein interfacial behavior is strongly linked to different factors like the solution pH or the presence of electrolytes. Here the nature of the electrolyte ions can significantly modify the interfacial properties of proteins. Therefore, molecular level studies on interfacial structures and charging states are needed. In this work, we addressed the effects of Y 3+ and Nd 3+ cations on the adsorption of the whey protein β-lactoglobulin (BLG) at airwater interfaces as a function of electrolyte concentration. Both cations caused very similar but dramatic changes at the interface and in the bulk solution. Here, measurements of the electrophoretic mobility and vibrational sum-frequency generation spectroscopy (SFG) were applied and consistently showed a reversal of the BLG net charge at remarkably low ion concentrations of 30

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Section: Introductionmentioning

confidence: 99%

Specific Ion Effects of Trivalent Cations on the Structure and Charging State of β-Lactoglobulin Adsorption Layers

2019

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“…They showed that the surfactant does not show a local maximum of foam stability/height at pH equal to pK a . 55 The calculated surface area per polar head for this surfactant was also not found to be minimum at pH equal to pK a (in contrast with classical carboxylate surfactants such as sodium laurate). 22 They attributed this behavior to the presence of large EO groups, which prevents the ion−dipole interaction between the ionized and unionized forms of surfactants.…”

Section: ■ Results and Discussionmentioning

confidence: 79%

“…This polyethoxylated carboxylate surfactant is similar to the surfactant studied in this work, which comprises ethylene oxide (EO) groups instead of PO groups such as in the TPC surfactant. They showed that the surfactant does not show a local maximum of foam stability/height at pH equal to p K a . The calculated surface area per polar head for this surfactant was also not found to be minimum at pH equal to p K a (in contrast with classical carboxylate surfactants such as sodium laurate) .…”

Section: Resultsmentioning

confidence: 96%

Multistimuli-Responsive Foams Using an Anionic Surfactant

et al. 2018

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In this work, we report a novel class of a commercially available surfactant which shows a multistimuli-responsive behavior toward foam stability. It comprises three components-a hydrophobe (tristyrylphenol), a temperature-sensitive block (polypropylene oxide, PO), and a pH-sensitive moiety (carboxyl group). The hydrophobicity-hydrophilicity balance of the surfactant can be tuned by changing either the pH or temperature of the system. At or below pH 4, the carboxyl functional group is dominantly protonated, resulting in zero foamability. At higher pH, the surfactant exhibits good foamability and foam stability marked with a fine bubble texture (∼200 μm). Foam destabilization could be achieved rapidly by either lowering the pH or bubbling CO gas. At a fixed pH in the presence of salt, increasing the temperature to 65 °C resulted in rapid defoaming because of the increased hydrophobicity of the PO chain. This stimuli-induced stabilization and destabilization of foam were found to be reversible. We envisage the use of such a multi-responsive foaming system in diverse applications such as foam-enhanced oil recovery and environmental remediation where spatial and temporal control over foam stability is desirable. The low-cost commercial availability of the surfactant further makes it lucrative.

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“…During the nickel ion flotation process, a part of the water is transferred along with the complexes of nickel ions and collector ions from the solution to the froth phase by the rising bubble. The amount of water transferred to the froth phase can be measured by a factor of transport (T) (Micheau et al, 2018). The factor of transport is explained as the ratio of the volume of collapsed foam to the volume of the initial foaming solution.…”

Section: Ion Flotation Efficiencymentioning

confidence: 99%

The effect of water recovery on the ion flotation process efficiency

Hoseinian¹,

Rezai²,

Kowsari³

et al. 2020

Physicochem. Probl. Miner. Process.

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The present study deals with nickel ions removal from dilute aqueous solution by ion flotation with emphasizing the process efficiency. The effect of collector structure on ion flotation efficiency and water recovery was evaluated using anionic collectors of sodium dodecyl sulfate (SDS) and functionalized graphene oxide by 2,6-diaminopyridine (AFGO). The results showed that process efficiency enhanced with the increase in pH and reached to complete removal at pH of 9 and 9.7 for SDS and AFGO, respectively. The AFGO showed the multifunctional bindings for complex formations with nickel ions. A coordinate bond may be formed between nickel ions and AFGO at the pH of 9 which increased nickel ion removal. The water recovery as a critical parameter that contributes to removal efficiency was significantly affected by the collector structure. The AFGO doesn't have a frothing property and so decreases the water recovery during the process. The AFGO had significantly lower water recovery than SDS (almost threefold).

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Ion foam flotation of neodymium: From speciation to extraction

Cited by 27 publications

References 35 publications

Specific Ion Effects of Trivalent Cations on the Structure and Charging State of β-Lactoglobulin Adsorption Layers

Specific Ion Effects of Trivalent Cations on the Structure and Charging State of β-Lactoglobulin Adsorption Layers

Multistimuli-Responsive Foams Using an Anionic Surfactant

The effect of water recovery on the ion flotation process efficiency

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