Surface chemistry of kaolinite and Na-montmorillonite in aqueous electrolyte solutions at 25 and 60°C: Experimental and modeling study

Tertre, Emmanuel; Castet, Sylvie; Berger, G.; Loubet, M.; Giffaut, Éric

doi:10.1016/j.gca.2006.07.017

Cited by 109 publications

(99 citation statements)

References 56 publications

(113 reference statements)

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“…The state and speciation of Ca-montmorillonite can also be modified with increasing temperature, which makes the direct comparison of the temperature effects for the same pH value a little difficult. 24 Tertre et al 25 studied the sorption of Ni(II) on Ca-montmorillonite and found that the sorption was clearly pH dependent with a net increase of K d (distribution coefficient) with increasing pH, which was consistent with the results of this study. Increasing reaction temperature promotes the sorption of Ni(II) on Ca-montmorillonite.…”

supporting

confidence: 88%

Sorption Speciation of Nickel(ii) onto Ca-Montmorillonite: Batch, EXAFS Techniques and Modeling

Tan

Montavon

et al. 2011

Dalton Trans.

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The sorption speciation of Ni(II) on Ca-montmorillonite was evaluated using a combination of batch experiments, extended X-ray absorption fine structure (EXAFS) spectroscopy and modeling. The pH and temperature at the aqueous-montmorillonite interface affects both the extent of Ni(II) sorption as well as the local atomic structure of the adsorbed Ni(II) ions. At 0.001 mol/L Ca(NO 3 ) 2 and low pH, the study reveals that the majority of Ni(II) is adsorbed in the interlayers of Ca-montmorillonite coordinated by six water molecules in an octahedron as an outer-sphere complex. At higher pH, inner-sphere surface complexes are formed. The Ni-Si/Al distances (R Ni-Al =3.00 Å, R Ni-Si1 =3.10 Å and R Ni-Si2 =3.26 Å) determined by EXAFS confirm the formation of mononuclear complexes located at the edges of Ca-montmorillonite platelets at pH 7.5 and 8.5. At pH 10.0, the Ni-Ni/Si distances (R Ni-Ni =3.07 Å and R Ni-Si =3.26Å) indicates the formation of Ni-phyllosilicate precipitates. A rise in temperature promotes inner-sphere complexation, which in turn leads to an increase in Ni(II) sorption on Ca-montmorillonite.Sorption edges are fitted excellently by surface complexation model (SCM) with the aid of surface species determined from EXAFS spectroscopy.

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supporting

confidence: 88%

Sorption Speciation of Nickel(ii) onto Ca-Montmorillonite: Batch, EXAFS Techniques and Modeling

Tan

Montavon

et al. 2011

Dalton Trans.

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“…Its surface element has various dissociations at different pH values and a range of behaviors in different surface capabilities (Tertre et al, 2006). In our study, as the pH increased, the percentage of bacterial adsorption on montmorillonite decreased.…”

Section: Discussionmentioning

confidence: 52%

Interaction of photosynthetic bacterium, <i>Rhodopseudomonas Palustris</i>, with montmorillonite clay

Wang¹,

Han

2011

Int. J. Eng. Sci. Tech

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In this study, we investigate the interaction of Rhodopseudomonas Palustris (R. Palustris) with montmorillonite clay. The adsorption of bacteria on the clay surface was also determined as a function of the initial bacterial quantity, pH, temperature and ionic strength. At different initial bacterial quantities, the percentage of bacteria adsorbed ranged from 61.07% to 77.57%, and the higher percentage was determined to be 15.0×108 cfu ml -1 . In addition, the actual number of adsorbed cells was significantly correlated with the initial quantity of R. Palustris. A greater degree of R. Palustris adsorption on the montmorillonite was observed in the temperature range of 30oC to 40oC. It was also found that as the pH and ionic strength increased the percentage of bacterial adsorption on montmorillonite decreased. There were no significant differences (P > 0.05) in the enzyme activities of aspartate aminotransferase (AST), alanine aminotransferase (ALT) and lactate dehydrogenase (LDH) between the bacteria treated with and without montmorillonite. However, montmorillonite supplementation significantly increased (P < 0.05) the cell surface hydrophobicity of R. Palustris compared with the control. These results indicated that the interaction was controlled by physicochemical characteristics between cells and the mineral substrate.

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“…A constant capacitance model was implemented (Tertre et al, 2006). The activity coefficient correction was made within FITEQL using the Davies equation.…”

Section: Surface Complexation Modelingmentioning

confidence: 99%

“…The total concentration of exchange site and the binding stability constants of XH and XNa were used as fixed input parameters when the titration data were fitted. These three values were 8.7 × 10 −4 mol g −1 , −2.2, and 1.4, respectively (Table S1 in the Supplement), which come from Tertre et al (2006) and Soltermann et al (2014). The acid-base constant and the site density of SOH and WOH were set as iterated parameters.…”

Section: Surface Complexation Modelingmentioning

confidence: 99%

Surface complexation modeling of Cd(II) sorption to montmorillonite, bacteria, and their composite

Wang

Huang

et al. 2016

Biogeosciences

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Abstract. Surface complexation modeling (SCM) has emerged as a powerful tool for simulating heavy metal adsorption processes on the surface of soil solid components under different geochemical conditions. The component additivity (CA) approach is one of the strategies that have been widely used in multicomponent systems. In this study, potentiometric titration, isothermal adsorption, zeta potential measurement, and extended X-ray absorption fine-structure (EXAFS) spectra analysis were conducted to investigate Cd adsorption on 2 : 1 clay mineral montmorillonite, on Grampositive bacteria Bacillus subtilis, and their mineral-organic composite. We developed constant capacitance models of Cd adsorption on montmorillonite, bacterial cells, and mineralorganic composite. The adsorption behavior of Cd on the surface of the composite was well explained by CA-SCM. Some deviations were observed from the model simulations at pH < 5, where the values predicted by the model were lower than the experimental results. The Cd complexes of X 2 Cd, SOCd + , R-COOCd + , and R-POCd + were the predominant species on the composite surface over the pH range of 3 to 8. The distribution ratio of the adsorbed Cd between montmorillonite and bacterial fractions in the composite as predicted by CA-SCM closely coincided with the estimated value of EXAFS at pH 6. The model could be useful for the prediction of heavy metal distribution at the interface of multicomponents and their risk evaluation in soils and associated environments.

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Surface chemistry of kaolinite and Na-montmorillonite in aqueous electrolyte solutions at 25 and 60°C: Experimental and modeling study

Cited by 109 publications

References 56 publications

Sorption Speciation of Nickel(ii) onto Ca-Montmorillonite: Batch, EXAFS Techniques and Modeling

Sorption Speciation of Nickel(ii) onto Ca-Montmorillonite: Batch, EXAFS Techniques and Modeling

Interaction of photosynthetic bacterium, <i>Rhodopseudomonas Palustris</i>, with montmorillonite clay

Surface complexation modeling of Cd(II) sorption to montmorillonite, bacteria, and their composite

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