Equilibrium Studies of Polyanions. II. Polyborates in NaClO4 Medium.

Ingri, Nils; Lagerström, Gösta; Frydman, Mina; Sillén, Lars Gunnar

doi:10.3891/acta.chem.scand.11-1034

Cited by 152 publications

(37 citation statements)

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“…Evidence for the existence of polynuclear boron species, B303(OH)4-and B404(OH)6 -2, was obtained by Ingri et al (1957), but these species are not present in significant amounts at low boron concentrations (<0.025 M). It was also found that boron adsorption by Na-and Ca-montmorillonite is completely reversible and that an insoluble salt of boron is not formed in the presence of CaCO3 and Ca(HC03)2 (Hingston, 1964).…”

Section: Resultsmentioning

confidence: 94%

Boron Adsorption by Clay Minerals Using a Phenomenological Equation

Keren

1981

Clays and clay miner.

178

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Abstract--Boron adsorption by Ca forms of montmorillonite, illite, and kaolinite was determined as a function ofpH and boron concentration in solution. Data from batch experiments were compared with results computed for each clay according to fitted adsorption coefficients (maximum boron adsorption and affinity constants related to the binding energy). The agreement between calculated values and experimental results indicates that a phenomenological equation can be used to predict boron adsorption on clays as a function of both of these variables. For the solution-to-clay ratios examined, the water content does not affect the boron-surface interaction as expressed by the above adsorption parameters. Because the affinity of clays for B(OHL-is much stronger than for B(OH) 3 , the adsorption maximum was obtained only under alkaline conditions at approximately pH 9.0 to 9.7. It is suggested that the pH of maximum adsorption is a function of the ratios of affinity coefficients of the three species B(OH)3, B(OH)4-, and OH-competing for the same adsorption sites. The adsorption coefficients indicate that in some cases the difference in the amount of adsorbed boron between montmorillonite and kaolinite could be either small or large, depending on the circumstances. The main factor that would affect this difference is the total amount of boron in the suspension. Estimated value of the adsorption maximum was 2.94, 11.8 and 15.1/zmole/g for Ca-kaolinite, Ca-montmorillonite, and Ca-illite, respectively.

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Section: Resultsmentioning

confidence: 94%

Boron Adsorption by Clay Minerals Using a Phenomenological Equation

Keren

1981

Clays and clay miner.

178

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“…The boron species include not only monomeric species, B(OH)3 and B(OH)4 , but also polyborates such as B303(OH)4 and B303(OH)s (Ingri et al, 1957;Spessard, 1970). Their concentrations de pend on the total boron concentration, the pH of the solution, temperature etc.…”

Section: Qualitative Explanation Of the Observed Boron Isotope Fractimentioning

confidence: 99%

Boron isotope fractionation accompanying boron mineral formation from aqueous boric acid-sodium hydroxide solutions at 25.DEG.C..

Kato

Ossaka

et al. 1991

Geochem. J.

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A series of experiments was carried out in which boron minerals were precipitated from pH and chemical composition-controlled solutions at 25°C and boron isotope fractionation accompanying the mineral deposition was measured. Borax, sassolite and sborgite were synthesized from aqueous boric acid-sodium hydroxide solutions. Borax was obtained from solutions with higher pH and sassolite from solutions with lower pH, irrespective of the mole ratio of B and Na in the solution. The fractionation factor, S, defined as S = ("B / 10B)minerai / ("B /'OB)s°luti°n increases with increasing the pH of the solution for both borax and sassolite. A cross-over point at which S=1 was found at about pH=9.5 for borax, while S was always larger than unity for sassolite. The present results of boron isotope fractionation are consistent with theoretical prediction of equilibrium isotope effects, although the experimental equilibrium constant of the boron isotope exchange reaction between B(OH)3 and B(OH)4 at 25'C is larger than that theoretically predicted (1.03-1.05 compared to 1.0194).

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“…The hydrolysis constant, Kh, for this reaction at infinite dilution is 5.9 • 10 10 at 25~ Other hydrolysis species (Kh = 5.0 x 10 13 and 5.0 z 10 -14, Ingri et al, 1957) were ignored. As a result, the adsorbed boron species can be made to include both B(OH)3 and B(OH)4-by introducing the following equations:…”

Section: Computationsmentioning

confidence: 99%

Effect of Exchangeable Ions and Ionic Strength on Boron Adsorption by Montmorillonite and Illite

Keren

1982

Clays and clay miner.

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Abstract--The effects of exchangeable Na and Ca and the ionic strength of NaC1 and CaC12 solutions on the boron adsorption by the Na and Ca forms of montmorillonite and illite at pH 9 were studied. The boron adsorption by montmorillonite was greater for the Ca form than for the Na form at any boron activity in solution and at any ionic strength. For example, the amount of boron adsorbed by Na-and Ca-montmorillonite was 2.9 and 4.3/zmole/g, respectively, at an ionic strength of 0.36 and a boron activity of 0.875 mmole/liter in equilibrium solution. The boron adsorption by illite was much greater than by montmorillonite. For example, the amount of boron adsorbed by Na-montmorillonite and Na-illite was 1.5 and 8.7 /zmole/g, respectively, at an ionic strength of 0.02 and a boron activity of 0.5 mmole/liter. However, the nature of the exchangeable cation had little effect on the boron adsorption by illite. The effect of the ionic strength on the boron adsorption by Na-montmorillonite was greater than that observed for either Camontmorillonite or illite. The data suggest that the negative electric field around the clay particles is one of the main factors controlling boron adsorption at alkaline pHs.

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Equilibrium Studies of Polyanions. II. Polyborates in NaClO4 Medium.

Cited by 152 publications

References 0 publications

Boron Adsorption by Clay Minerals Using a Phenomenological Equation

Boron Adsorption by Clay Minerals Using a Phenomenological Equation

Boron isotope fractionation accompanying boron mineral formation from aqueous boric acid-sodium hydroxide solutions at 25.DEG.C..

Effect of Exchangeable Ions and Ionic Strength on Boron Adsorption by Montmorillonite and Illite

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