Migration Studies with Ferric Oxide Sols. I. Positive Sols

Hazel, Fred; Ayres, Gilbert H.

doi:10.1021/j150328a004

Cited by 16 publications

(10 citation statements)

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“…Migration velocities were determined by a method previously described (11). Measurements of pH were made with the glass electrode at approximately the same time as the migration velocities.…”

Section: Introductionmentioning

confidence: 99%

Migration Studies with Colloids. III. The Behavior of Gelatin-protected Ferric Oxide and Manganese Dioxide Sols

Hazel¹,

King²

1935

J. Phys. Chem.

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Section: Introductionmentioning

confidence: 99%

Migration Studies with Colloids. III. The Behavior of Gelatin-protected Ferric Oxide and Manganese Dioxide Sols

Hazel¹,

King²

1935

J. Phys. Chem.

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“…Because a preliminary, electrostatic adsorption step is required before ferric oxide can be foam-separated with an anionic surfactant, the colloid must carry a positive charge. The zero points of charge of ferric oxide sols have been determined by miero-electrophorests techniques and have been reported to occur at pH = 8.3 (20) and at pH--8.6 (21). The somewhat higher value (9-9.5) that would be indicated by Figure 2 was produced because the colloid was nondialyzed and/or because there were variations in ionic strength compared with those employed for the microelectrophoresis experiments.…”

Section: Resultsmentioning

confidence: 99%

The foam separation of colloidal ferric oxide with an anionic and a cationic surfactant

Grieves

Bhattacharyya

1967

J Americ Oil Chem Soc

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An experimental investigation is presented of the foam separation of colloidal ferric oxide over the pH range 3 to 12 by using an anionic and a cationic surfactant. A sol containing 1.67 mmole/ liter (93 mg/liter) of trivalent iron can be reduced in concentration to 0.09 mmole/liter by 0.17 mmole/liter dodecyl sodium sulfate (anionic) over pH 4.5 to 8; and to 0.18 mmole/liter by 0.17 mmole/liter ethylhexadecyldimethylammonium bromide (cationic) over pH 10 to 12. Soluble iron species produce poorer separations. Between pH 8 and pH 10 the charge of the colloid is reversed from positive to negative, and for an efficient separation a two‐step process should be used, first with an anionic surfactant and then with a cationic. The charge of the particulates has little effect on the foam separation of the surfactants although the presence of the particulates has a significant effect, as evidenced by residual surfactant concentrations and collapsed foam volumes.

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“…Schuylenborg et ale (l950) Hazel and Ayres (1931) Mattson and Pugh (1934) pH ( . (James, personal communication, and Hingston et aL.…”

Section: Hydroxi Desmentioning

confidence: 99%

The interaction of metal ions at the hydrous manganese dioxide-solution interface

Murray¹

1973

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Migration Studies with Ferric Oxide Sols. I. Positive Sols

Cited by 16 publications

References 0 publications

Migration Studies with Colloids. III. The Behavior of Gelatin-protected Ferric Oxide and Manganese Dioxide Sols

Migration Studies with Colloids. III. The Behavior of Gelatin-protected Ferric Oxide and Manganese Dioxide Sols

The foam separation of colloidal ferric oxide with an anionic and a cationic surfactant

The interaction of metal ions at the hydrous manganese dioxide-solution interface

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