Ligand properties of surface silanol groups. I. surface complex formation with Fe3+, Cu2+, Cd2+, and Pb2+

Schindler, P.; Fürst, B.; Dick, Richard P.; Wolf, P.U.

doi:10.1016/0021-9797(76)90057-6

Cited by 526 publications

(204 citation statements)

References 17 publications

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“…The complexation model is taken from Schindler et al [1976] and is shown in Figure 2. The equilibrium constants for leading reactions in the aqueous solution of copper sulfate are given in Table 2.…”

Section: Sorption Of Coppermentioning

confidence: 99%

Induced polarization signatures of cations exhibiting differential sorption behaviors in saturated sands

Vaudelet

Revil

Schmutz

et al. 2011

Water Resources Research

104

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[1] Two sets of experiments were designed to understand the change in induced polarization associated with the sorption of copper and sodium, exhibiting distinct sorption behavior on a silica sand. A sand column experiment was first performed to see the change in the complex conductivity during the advective transport of a copper sulfate solution. A second set of experiments was done with the sand at equilibrium with various solutions of NaCl and CuSO 4 . In the first experiment, the copper sulfate solution replaced a sodium chloride solution, keeping the electrical conductivity of the solution nearly constant. During the passage of the copper sulfate solution, the apparent phase angle decreased from 3 6 0.2 to 0.5 6 0.2 mrad, while the magnitude of the conductivity of the sand remained nearly constant. A quantitative model is proposed to explain the change in the complex conductivity as a function of the chemistry assuming a polarization mechanism associated with the Stern layer (the inner part of the electrical double layer coating the water-mineral interface). The Stern layer polarization is combined with a complexation model describing the competitive sorption of copper and sodium at the pore water interface. The change of the phase lag is directly associated with the ion exchange between sodium and copper at the surface of the silica grains. The explanation of the observed phase differences between Na and Cu relies on their different complexation behaviors, with Na being loosely absorbed, while Cu forms relatively strong complexation with both inner (monodentate) and outer sphere (bidentate) complexes. The replacement of Cu 2þ by Na þ is less favorable; therefore, the kinetics of such a replacement is much slower than for the opposite replacement (Na þ by Cu 2þ ). We were able to reproduce the changes in the phase lags at thermodynamic equilibrium near the relaxation frequency and in the frequency domain. These measurements and modeling results open the door to the quantitative interpretation of spectral induced polarization data in the field in terms of quantification of the sorption processes.Citation: Vaudelet, P., A. Revil, M. Schmutz, M. Franceschi, and P. Bégassat (2011), Induced polarization signatures of cations exhibiting differential sorption behaviors in saturated sands, Water Resour. Res., 47, W02526,

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Section: Sorption Of Coppermentioning

confidence: 99%

Induced polarization signatures of cations exhibiting differential sorption behaviors in saturated sands

Vaudelet

Revil

Schmutz

et al. 2011

Water Resources Research

104

View full text Add to dashboard Cite

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“…To understand and describe the surface reactions at the solid-liquid interface, a variety of surface reaction models have been proposed [16][17][18][19][20][21][22][23][24][25]. Most of these models involve interface reactions at fixed surface sites, including different electrostatic layers, besides surface protonation or deprotonation.…”

Section: Introductionmentioning

confidence: 99%

Surface acid–base properties and hydration/dehydration mechanisms of aluminum (hydr)oxides

Yang

Sun

Wang

et al. 2007

Journal of Colloid and Interface Science

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“…According to Iler [32], the adsorption of transition metal ions on silica is due to interaction with active sites at the silica surface which act like ligands, and the specificity of adsorption is therefore related to the tendency of the metal atom to form covalent bonds. Schindler et al [31] supports this theory having found that the ligand properties of surface silanol groups for transition metal ions (Fe(III), Cu(II), Cd(II) and Pb(II)) strongly correlate with known stability constants for corresponding metal-hydroxocomplexes. In fact, this stability data are in good agreement with selectivity reported in several papers [28,30,31], where the following order of specificity of formation of covalent bonds with silica surface was observed for transition metals: Cd(II) < Ni(II) < Zn(II) < Co(II) < Cu(II) < Pb(II).…”

Section: Transition Metals-organic Solvent and Buffer Effectsmentioning

confidence: 85%

“…A number of studies have been carried out on the ionexchange capacities of various forms of silica gel for divalent cations, including transition and heavy metal ions [25][26][27][28][29][30][31][32]. In many cases, these investigations have studied relatively large particle size silica gels, and have not investigated high-performance phases for ion chromatographic separations.…”

Section: Transition Metals-organic Solvent and Buffer Effectsmentioning

confidence: 99%

Solvent enhanced ion chromatography of alkaline earth and transition metal ions on porous monolithic silica

Sugrue

Nesterenko

Paull

2005

Analytica Chimica Acta

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The high-performance separation of alkaline earth and transition metal ions on a bare porous silica 10.0 cm × 0.46 cm monolith (Merck Chromolith Si) was achieved using solvent enhanced ion chromatography. Using acetonitrile or methanol based ammonium and sodium acetate buffered mobile phases, the effect upon cation retention of mobile phase ionic strength, organic content and pH were evaluated. Increasing mobile phase acetonitrile concentration from 60 to 80% acetonitrile resulted in 10-15-fold increases in cation retention due to reduced hydration of the metal ions and hence enhanced ion-exchange interactions with surface silanol groups. The optimised conditions for the separation of Cu(II), Cd(II), Ni(II), Co(II) and Mn(II) were found to be 80% MeCN with 10.3 mM ammonium acetate (pH 4.6). Detection of transition metal ions was obtained using post-column reaction with 4-(2-pyridylazo) resorcinol and absorbance at 510 nm. Under elevated flow conditions (up to 5 mL/min), total runs times could be reduced to under 4 min. Optimum peak efficiencies were seen at flow rates of between 1.5 and 2 mL/min and were equivalent to an average efficiency of 25,000 N/m.

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Ligand properties of surface silanol groups. I. surface complex formation with Fe3+, Cu2+, Cd2+, and Pb2+

Cited by 526 publications

References 17 publications

Induced polarization signatures of cations exhibiting differential sorption behaviors in saturated sands

Induced polarization signatures of cations exhibiting differential sorption behaviors in saturated sands

Surface acid–base properties and hydration/dehydration mechanisms of aluminum (hydr)oxides

Solvent enhanced ion chromatography of alkaline earth and transition metal ions on porous monolithic silica

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