Thermodynamic studies of dodecylpyridinium ion binding to fulvic acid

Yee, Min Min; Miyajima, Tohru; Takisawa, Noboru

doi:10.1016/j.colsurfa.2006.03.023

Cited by 1 publication

(4 citation statements)

References 25 publications

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“…Comparing the ion binding models for metal oxides and silica with those of humic substances it follows that the electrostatic part of the model for metal oxides and silica is far more complicated than that of the humic substances, especially when the adsorption of ions other than protons is considered; for humic substances the heterogeneity is most important. driven by a positive entropy [99], while the enthalpy of C12P + binding with AHA was slightly negative [101]. For AFA different binding modes were observed at two pH regions, i.e., cooperative binding at pH > 7 and non-cooperative binding at pH < 7 , see Fig.…”

Section: Discussionmentioning

confidence: 90%

“…For AFA different binding modes were observed at two pH regions, i.e., cooperative binding at pH > 7 and non-cooperative binding at pH < 7 , see Fig. 8 [99].…”

Section: Discussionmentioning

confidence: 98%

“…Yee et al [99,101] binds super-equivalently to PAHA. Before the CIP, where the complex is negative, the salt concentration screens the negative charge of the complex and this diminishes the head group surface attraction, at the CIP the complex is net uncharged and salt has no effect, beyond the CIP the complex is positive and the salt concentration screens the repulsion between the head groups.…”

Section: Discussionmentioning

confidence: 99%

“…As discussed in the section 'Modeling surfactant -humic substance interaction' Chen et al [114] used Eq. 14 to unravel the surfactant binding and the Hill equations used by Yee et al [98][99][100][101] are identical to Eq. 14.…”

Section: Nica-donnan Model Applied To Surfactant Sorption On Humic Anmentioning

confidence: 99%

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Surfactant adsorption to soil components and soils

Ishiguro

Koopal

2016

Advances in Colloid and Interface Science

111

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Soils are complex and widely varying mixtures of organic matter and inorganic materials; adsorption of surfactants to soils is therefore related to the soil composition. We first discuss the properties of surfactants, including the critical micelle concentration (CMC) and surfactant adsorption on water/air interfaces, the latter gives an impression of surfactant adsorption to a hydrophobic surface and illustrates the importance of the CMC for the adsorption process. Then attention is paid to the most important types of soil particles: humic and fulvic acids, silica, metal oxides and layered aluminosilicates. Information is provided on their structure, surface properties and primary (proton) charge characteristics, which are all important for surfactant binding. Subsequently, the adsorption of different types of surfactants on these individual soil components is discussed in detail, based on mainly experimental results and considering the specific (chemical) and electrostatic interactions, with hydrophobic attraction as an important component of the specific interactions. Adsorption models that can describe the features semi-quantitatively are briefly discussed. In the last part of the paper some trends of surfactant adsorption on soils are briefly discussed together with some complications that may occur and finally the consequences of surfactant adsorption for soil colloidal stability and permeability are considered. When we seek to understand the fate of surfactants in soil and aqueous environments, the hydrophobicity and charge density of the soil or soil particles, must be considered together with the structure, hydrophobicity and charge of the surfactants, because these factors affect the adsorption. The pH and ionic strength are important parameters with respect to the charge density of the particles. As surfactant adsorption influences soil structure and permeability, insight in surfactant adsorption to soil particles is useful for good soil management.

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Section: Discussionmentioning

confidence: 90%

“…For AFA different binding modes were observed at two pH regions, i.e., cooperative binding at pH > 7 and non-cooperative binding at pH < 7 , see Fig. 8 [99].…”

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%