The role of hydrolyzed metal cations in the liquid-liquid extraction of ultrafine silica with dodecyl sulfate

Kusaka, Eishi; Kamata, Y.; Fukunaka, Yasuhiro; Nakahiro, Yoshitaka

doi:10.1016/s0892-6875(96)00142-2

Cited by 14 publications

(12 citation statements)

References 6 publications

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“…Comparing each result of flotation and each diagram shows that all the activation ranges observed in this study are within the pH ranges in which each hydroxide precipitate is predominant. In general, activation arises from the pH ranges in which hydroxy complex is formed prior to hydroxide precipitation in a number of publications [6][7][8][9][10][11][12] . However, such activation pattern is not observed in this study.…”

Section: Resultsmentioning

confidence: 99%

“…In a physicochemical separation system, hydrolyzed metal cations modify the negatively charged mineral surface in a number of ways. Generally, they have been used in the flotation of oxide and sulfide minerals [6][7][8][9][10] and in liquid-liquid extraction, the role of hydrolysable metal cation having been studied [11][12] . Recently, they have been used in the deinking process in paper recycling for the removal of ink using flotation 13) .…”

Section: Introductionmentioning

confidence: 99%

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Activation with Polyvalent Metal Salts in the Anionic Flotation of Starch -Fundamental Study on the Removal of Organic Matters from Wastewater-

Kusaka

Yokoi

2008

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The effects of hydrolysable metal salts on the flotation of potato starch with anionic surfactant, sodium dodecylsulfate, were investigated. It was presented that negatively charged starch surface was activated by the hydrolysable metal salts of Al(III), Fe(III), Cu(II) and Ni(II). The pH range in which the activation was observed ranged from the precipitation pH of each metal hydroxide to the isoelectric point, IEP, of each hydroxide precipitate. SEM images indicated that starch particles were covered with hydroxide precipitate above the precipitation pH. The results of adsorption test and micro electrophoresis indicated that the effect of adsorbed hydroxy complex was not sufficient to reverse the negative charge of starch surface. These results suggested that in the anionic flotation of starch it was not hydroxy complexes but hydroxide precipitates that acted as an activating species which modified the starch particle surface.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Activation with Polyvalent Metal Salts in the Anionic Flotation of Starch -Fundamental Study on the Removal of Organic Matters from Wastewater-

Kusaka

Yokoi

2008

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“…5 This means that in a certain pH range, the anionic surfactant can adsorb on the now positively charged surface and hydrophobize the particles. 14 Hydrophobization allows liquid−liquid extraction because otherwise the electrostatic repulsion between particles and oil droplets is too strong. 14 This article is licensed under CC-BY 4 ■ THEORETICAL BASIS Electric Double Layer.…”

Section: ■ Introductionmentioning

confidence: 99%

“…14 Hydrophobization allows liquid−liquid extraction because otherwise the electrostatic repulsion between particles and oil droplets is too strong. 14 This article is licensed under CC-BY 4 ■ THEORETICAL BASIS Electric Double Layer. When a metal oxide is added to an electrolyte solution, two mechanisms can occur that are responsible for the surface charge.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Because most oxides are negatively charged over a wide pH range, no selective adsorption of an ionic surfactant is possible. A specific adsorption of surfactant is required, for example, for the separation of particle mixtures or ore components because the surface properties are changed by adsorption of surfactants. , In the literature it is found that an activation of the particle surface can be used for specific adsorption of surfactants, where the activation of the negatively charged mineral surfaces can be achieved with the aid of hydrolyzed metal cations . Kusaka et al published that the addition of La 3+ , Al 3+ , and Fe 3+ ions affects the yield of liquid–liquid extraction of silica.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Hydrolyzed Metal Ions and Surfactants on the Phase Transfer of Al₂O₃, SiO₂, and SnO₂

Heilmann,

Ditscherlein,

Peuker

2024

Langmuir

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There are various possibilities for changing the surface properties of particles. In this work, the charge reversal on different metal oxides with different electrolytes is investigated and whether this allows a change in wettability due to a subsequent adsorption of surfactants, e.g., sodium dodecyl sulfate (SDS). It is investigated if the materials of the particles differ only by the isoelectric point or if the surface chemistry of the materials has an influence on the charge reversal as well. Furthermore, the adsorption of SDS as an anionic surfactant is examined, which is also characterized by a second charge reversal and related to a sign change of the electrophoretic mobility μ e . Finally, it is examined whether the adsorption of the hydrolyzed metal ions and the subsequent adsorption of SDS are effective enough to hydrophobize the particles and allow phase transfer from the aqueous to second nonaqueous liquid phase. In addition, the influence of pH is investigated because the hydrolyzed metal cations are formed only in a certain pH range, which means that the bridge formed between the particle surface and the surfactant works only in a certain pH range, which would allow pH-selective extraction of the particle system into the second nonaqueous liquid phase.

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Adsorption Isotherm of Sodium Octylbenzenesulfonate on Iron Oxide Particles in Aqueous Solutions

Dao

Bée

Treiner

1998

Journal of Colloid and Interface Science

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The role of hydrolyzed metal cations in the liquid-liquid extraction of ultrafine silica with dodecyl sulfate

Cited by 14 publications

References 6 publications

Activation with Polyvalent Metal Salts in the Anionic Flotation of Starch -Fundamental Study on the Removal of Organic Matters from Wastewater-

Activation with Polyvalent Metal Salts in the Anionic Flotation of Starch -Fundamental Study on the Removal of Organic Matters from Wastewater-

Influence of Hydrolyzed Metal Ions and Surfactants on the Phase Transfer of Al₂O₃, SiO₂, and SnO₂

Adsorption Isotherm of Sodium Octylbenzenesulfonate on Iron Oxide Particles in Aqueous Solutions

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The role of hydrolyzed metal cations in the liquid-liquid extraction of ultrafine silica with dodecyl sulfate

Cited by 14 publications

References 6 publications

Activation with Polyvalent Metal Salts in the Anionic Flotation of Starch -Fundamental Study on the Removal of Organic Matters from Wastewater-

Activation with Polyvalent Metal Salts in the Anionic Flotation of Starch -Fundamental Study on the Removal of Organic Matters from Wastewater-

Influence of Hydrolyzed Metal Ions and Surfactants on the Phase Transfer of Al2O3, SiO2, and SnO2

Adsorption Isotherm of Sodium Octylbenzenesulfonate on Iron Oxide Particles in Aqueous Solutions

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Influence of Hydrolyzed Metal Ions and Surfactants on the Phase Transfer of Al₂O₃, SiO₂, and SnO₂