Adsorption of Alkylphosphoric Acid on Kaolinite and Smectite in an Organic Medium (Decane)

Siffert, Bernard

doi:10.1346/ccmn.1981.0290406

Cited by 4 publications

(9 citation statements)

References 15 publications

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“…This differentiation of the sites was not apparent in the pure decane system (Siffert and Trescol, 1981). Two hypotheses can be proposed to explain this finding.…”

Section: Adsorption Isothermsmentioning

confidence: 80%

“…Clays and Clay Minerals Figure 1 shows the isotherms for di-2 EHPA adsorption onto H+-kaolinite and H+-montmorillonite. Uptake on both minerals is lower in the presence of water than in the organic medium alone (Siffert and Trescol, 1981). Water molecules compete with di-2 EHPA for adsorption sites.…”

Section: Methodsmentioning

confidence: 88%

“…The purification and preparation of the clay minerals used were described by Siffert and Trescol (1981). Di-2 EHPA, the organic extracting agent, which removes heavy cations by forming soluble complexes in organic phase, was tagged with W 2 or C 14 and used in n-decane solution, at concentrations ranging from 0.025 to 0.25 Copyright 9 1982, The Clay Minerals Society N (8.06 to 80.6 g/liter).…”

Section: Methodsmentioning

confidence: 99%

“…Curve I is an L-type isotherm according to Giles' classification (Giles et al, 1960) and yields a limiting value of 12.2 mg/g, calculated from a linear transform of the isotherm. Adsorption takes place on the edge-surface AP + at the rate of one anion per absorbing cation (Siffert and Trescol, 1981). The mechanism is an exchange of phosphate ions for AI-OH groups (Parfitt, 1978).…”

Section: Methodsmentioning

confidence: 99%

“…In their study of the adsorption of di-2 EHPA on H+-clays in decane, Siffert and Trescol (1981) observed that the phosphoric acid group of the di-2 EHPA molecule reacted strongly in the anionic form (RO2)2PO2 with edge-surface cations of the clay. Adsorption of di-2 EHPA on montmorillonite and kaolinite took place at the rate of one alkylphosphate anion per surface cation, whereas adsorption on hectorite was somewhat less, taking place at the rate of two anions per three surface cations.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Alkylphosphoric Acid on Kaolinite and Smectite in Water-Decane

Siffert¹

1982

Clays and clay miner.

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Abstraet--Bis-ethyl 2-hexylphosphoric acid (di-2 EHPA) dissolved in decane is chemisorbed on kaolinite and montmorillonite dispersed in an acidic aqueous solution. The adsorption results in the formation of complexes with the surface cations of the clays. The adsorption isotherms are of the Langmuir type and reveal a limiting value of adsorption on H+-kaolinite of 12.2 mg/g, comparable to that measured in the absence of water. For H+-montmorillonite, however, the limiting value in the presence of acid is somewhat less (20.6 mg/g vs. 23.8 mg/g). Di-2 EHPA does not react with the magnesium cations available at the surface. The isotherm is "stepped" and suggests the presence of adsorption sites with distinctly differentiated energies. The sites of di-2 EHPA adsorption can be masked by treating the two clay minerals with polyphosphate anions. Thus, with pyro-and tripolyphosphate anions, di-2 EHPA uptake in acidic medium is very low. Adsorbed di-2 EHPA can be recovered by treating the clays with fluoride, hydroxyl, and dihydrogenphosphate anions. Dihydrogenphosphate anions lead, however, to a state of equilibrium between the organic and inorganic phosphate anions adsorbed.

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“…This differentiation of the sites was not apparent in the pure decane system (Siffert and Trescol, 1981). Two hypotheses can be proposed to explain this finding.…”

Section: Adsorption Isothermsmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Adsorption of Alkylphosphoric Acid on Kaolinite and Smectite in Water-Decane

Siffert¹

1982

Clays and clay miner.

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Study of the surface ionization of kaolinite in water by zetametry—Influence on the rheological properties of kaolinite suspension

Siffert

Kim

1992

Applied Clay Science

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A Review on the Adsorption Studies of Tetracycline onto Various Types of Adsorbents

Priya

Radha

2017

Chemical Engineering Communications

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Over the past few decades, the usage of antibiotics is growing on a rapid phase. The continuous use in the treatment against several bacterial infections paves a way to increased resistant strains. Environmental pollution created by antibiotics is considered as a serious problem though no toxic reports were known until now. The pharmaceutical compounds present in the environment are known as "Emerging Pollutants." Among antibiotics tetracycline (TET) class of drugs were known to exist for several years.Within 3-4 years of the discovery of the first class of TET, the resistant strains were also identified. TET usage is not only limited for human therapy but also greatly used in veterinary and agricultural purposes. These compounds have been detected in the environment, especially in aquatic farms, groundwater, surface water, etc., thus, it becomes vital to take some measures in removing these compounds from the ecosystem to some extent. Many degradation methodologies, mechanisms were applied to remove TET but were highly limited to synthetic effluents. Adsorption is a common practice at the industrial level, especially in effluent treatment processes. In this study, removal of TET through adsorption using various adsorbent was reviewed extensively.

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Adsorption of Alkylphosphoric Acid on Kaolinite and Smectite in an Organic Medium (Decane)

Cited by 4 publications

References 15 publications

Adsorption of Alkylphosphoric Acid on Kaolinite and Smectite in Water-Decane

Adsorption of Alkylphosphoric Acid on Kaolinite and Smectite in Water-Decane

Study of the surface ionization of kaolinite in water by zetametry—Influence on the rheological properties of kaolinite suspension

A Review on the Adsorption Studies of Tetracycline onto Various Types of Adsorbents

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