Effect of electrolyte concentration on the interaction of humic acid and humate with montmorillonite

Tombácz, Etelka; Gilde, Mária; Ábrahám, Imre; Szántó, F.

doi:10.1016/0169-1317(88)90004-x

Cited by 27 publications

(7 citation statements)

References 26 publications

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“…The amount of humic acids in moles cannot be given, because the molecular weight of these natural materials is undefined due to their polydisperse and fractal feature [13], but the size of humic molecules is not too large in general, from 2 to 7 nm, as reported recently [36]. The number average molecular weight of HA sample extracted similarly from the same source before [37] was 10600 g/mol. The amount of HA is related its mass in general, the milligrams of either the dried HA sample or its carbon content are usually used to give the concentration of HA solutions in mg/L unit.…”

Section: Methodsmentioning

confidence: 93%

The effect of humic acid adsorption on pH-dependent surface charging and aggregation of magnetite nanoparticles

Illés

Tombácz

2006

Journal of Colloid and Interface Science

509

308

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Section: Methodsmentioning

confidence: 93%

The effect of humic acid adsorption on pH-dependent surface charging and aggregation of magnetite nanoparticles

Illés

Tombácz

2006

Journal of Colloid and Interface Science

509

308

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“…We cannot establish whether these organo-mineral complexes were present in the soil and have been extracted or whether they are formed between two dissolved separated phases. On the other hand, the binding of HA to kaolinite and montmorillonite at pH ≤3 has been assessed by several adsorption studies [45][46][47][48][49]. The interaction between humic substances and clay minerals can include specific and columbic interactions, but Schutless et al [46] recommend being careful in interpreting adsorption studies since at low pH values, adsorption and precipitation mechanisms are difficult to differentiate.…”

Section: Discussionmentioning

confidence: 99%

Chemical and spectroscopic characterization of insoluble and soluble humic acid fractions at different pH values

Baglieri

Vindrola

Gennari

et al. 2014

Chem. Biol. Technol. Agric.

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Background: Humic acids (HA) are organic molecules with complex structure and function and variable properties. They are insoluble in strongly acid pH conditions. At present, it is not clear how much is the amount of HA in solution at the pH of natural soils nor are known the characteristics of the different soluble fractions and their possible association with the inorganic phase of soil. The scope of this work was to characterize the soluble and insoluble fractions obtained by acidifying Na humate solution at pH values 3, 5, and 7 and to compare these fractions with the HA obtained at pH 1. At each pH, the precipitate and the soluble fractions were separated and characterized by elemental analysis, total acidity and carboxylic group content, infrared, and 13 C NMR and

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“…and Mason S.G., 1975). More systematic studies on the strength of flocs were reported by Sonntag and Russel for a floc made of polystyrene latex particles (Sonntag R.C and Russel W.B., 1987a, 1987b, 1988. Later, on this subject, Kobayashi et al (1999) proposed a simple theory, that is,…”

Section: Simple Formalismmentioning

confidence: 99%

Rheology and Sedimentation of Aqueous Suspension of Na-montmorillonite in the Very Dilute Domain

Adachi

Kawashima

Ghazali

2020

KONA

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The scheme of DLVO theory and the concept of fractal structure of flocs applied to the suspension of montmorillonite have revealed out the unique nature of this clay dispersion. In this context, two major regimes are recognized. The first is the electrostatically dispersed regime. And the second is the coagulated regime. In the former, the formation of a diffusive electric double layer (EDL) characterized by reciprocal Debye length measured from the surface of the particle is distinctively important. Intrinsic viscosity with electroviscous effects and yield stress are interpreted by the steric presence of EDL. In the latter, the unit of transportation is a coagulated floc with finite cohesive strength. Sedimentation process reflecting these factors is carefully observed to recognize the turbulence generation by the formation of large flocs at the moment of gel collapse. Waiting time prior to gel collapse was found to be determined reflecting the pH-dependent charging behavior. By taking into account the effect pH-dependent charge, the DLVO based two regimes are further categorized into five. The developed tools can be extensively used for the system involved with different ionic species, pH, volume fraction and organic substances.

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Effect of electrolyte concentration on the interaction of humic acid and humate with montmorillonite

Cited by 27 publications

References 26 publications

The effect of humic acid adsorption on pH-dependent surface charging and aggregation of magnetite nanoparticles

The effect of humic acid adsorption on pH-dependent surface charging and aggregation of magnetite nanoparticles

Chemical and spectroscopic characterization of insoluble and soluble humic acid fractions at different pH values

Rheology and Sedimentation of Aqueous Suspension of Na-montmorillonite in the Very Dilute Domain

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