Adsorption of Fe(III), Co(II) and Zn(II) onto particulates in fresh waters on the basis of the surface complexation model I. Stabilities of metal species adsorbed on particulates

Osaki, Susumu; Miyoshi, Tomoko; Sugihara, Shinji; Takashima, Yoshimasa

doi:10.1016/0048-9697(90)90215-g

Cited by 18 publications

(3 citation statements)

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“…They suggested that the adsorption behavior of natural sediment can be modeled via one or two surface reactions. Charlet (26) and Osaki et al (27,28) used the concept of triple layer SCMs and constant capacitance SCMs to study the behavior of metal adsorption on oxic sediment. Wang (29) tried successfully to apply the diffuse layer SCMs to describe his metal adsorption data.…”

Section: Introductionmentioning

confidence: 99%

“…Using SCMs to describe the adsorption behavior of pure clay minerals has been reported (30-32). Although these studies have employed SCMs to describe adsorption, SCMs have not been widely used with natural materials because of insufficient or missing data, particularly a data base of model constants and pertinent information regarding surface properties of natural sediment (21)(22)(23)(24)(25)(26)(27)(28)(29). Obviously, more work is needed in this field.…”

Section: Introductionmentioning

confidence: 99%

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Surface Complexation Model for the Heavy Metal Adsorption on Natural Sediment

Wen

Tang

1998

Environ. Sci. Technol.

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Surface complexation models (SCMs) have been successfully used to describe metal ion adsorption on pure mineral materials. However, such models have rarely been applied to model adsorption on natural materials. In this study, the surface complexation model approach was used to describe the surface properties and adsorption behavior of natural aquatic sediment. Three typical versions of the surface complexation model were used: constant capacitance model (CCM), diffuse layer model (DLM), and triple layer model (TLM). All the model parameters were determined on the basis of the experimental data of the potentiometric titration and the metal adsorption isotherm using LeAn River (China) sediment. The experimental data of the adsorption edges were used to verify the performance of the models. This work indicated that all three models can simulate the experimental results very well. In predicting the adsorption behavior of the sediment sample, the relative errors of these three models were quite close. The results illustrate that SCMs can be used to successfully model natural materials. IntroductionThe behavior, transport, and ultimate fate of heavy metals in aquatic environment depend largely on their sorption reactions with sediment particles (1-4). Thus, it is very important to investigate such reactions. Different empirical approaches, in particular the measurement of adsorption isotherms and the corresponding partitioning parameters, have commonly been used in the studies of the adsorption behavior of natural sediments or soils (5-10). However, limitations of these empirical ways have been observed (1,(11)(12)(13). Extensive studies have been made on surface complexation models (SCMs) to describe the adsorption of heavy metals on pure mineral surfaces, especially on pure hydrous oxide solid surfaces; the results are quite promising (14)(15)(16)(17)(18)(19)(20)(21)(22)(23). It has also been hoped that SCMs can be used with natural materials, but unfortunately, there have been very few studies that apply SCMs to natural materials and to sediments in particular. Mouvet and Bourg (24) were the first to use the chemical equilibrium models to quantitatively describe the adsorption data of metals to river sediment. They reported that the adsorption constants of the metals are directly proportional to their first hydrolysis constants. They concluded that to a certain degree the chemical equilibrium program can be used to predict the speciation of Cu, Ni, Pb, and Zn in a river. Fu and Allen (25) studied the Cd adsorption on an oxic sediment sample by carrying out both acid-base titration experiments and Cd adsorption experiments with the sediment sample. They used a multisite binding model that contained the effect of pH by considering the titration data against their adsorption data. The results derived from the model were close to that from the experiment. They suggested that the adsorption behavior of natural sediment can be modeled via one or two surface reactions. Charlet (26) and Osaki et al. (27,28) used the conce...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface Complexation Model for the Heavy Metal Adsorption on Natural Sediment

Wen

Tang

1998

Environ. Sci. Technol.

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“…The type of Zn adsorption complex(es) formed on the surface of silica in aqueous environments depends on ionic strength and Zn surface coverage as determined by pH and the concentration of Zn relative to the amount of available reactive mineral surface area (Nelson et al, 2017(Nelson et al, , 2018Roberts et al, 2003;Anderson & Benjamin, 1990;Osaki et al, 1990;Sverjensky, 1993;Davis et al, 1998;Liu et al, 2003). At circumneutral pH, ionic strength less than 1 M and Zn surface coverage less than 4 mmol m À2 , quartz bears outer-sphere and inner-sphere Zn complexes, whereas SiO 2(am) hosts only innersphere Zn complexes (Nelson et al, 2017(Nelson et al, , 2018Roberts et al, 2003).…”

Section: Zn Ads On Silicamentioning

confidence: 99%

XANES reflects coordination change and underlying surface disorder of zinc adsorbed to silica

Nelson

2021

J Synchrotron Rad

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Zinc K-edge X-ray absorption near-edge structure (XANES) spectroscopy of Zn adsorbed to silica and Zn-bearing minerals, salts and solutions was conducted to explore how XANES spectra reflect coordination environment and disorder in the surface to which a metal ion is sorbed. Specifically, XANES spectra for five distinct Zn adsorption complexes (Znads) on quartz and amorphous silica [SiO2(am)] are presented from the Zn–water–silica surface system: outer-sphere octahedral Znads on quartz, inner-sphere octahedral Znads on quartz, inner-sphere tetrahedral Znads on quartz, inner-sphere octahedral Znads on SiO2(am) and inner-sphere tetrahedral Znads on SiO2(am). XANES spectral analysis of these complexes on quartz versus SiO2(am) reveals that normalized peak absorbance and K-edge energy position generally decrease with increasing surface disorder and decreasing Zn–O coordination. On quartz, the absorption-edge energy of Znads ranges from 9663.0 to 9664.1 eV for samples dominated by tetrahedrally versus octahedrally coordinated species, respectively. On SiO2(am), the absorption-edge energy of Znads ranges from 9662.3 to 9663.4 eV for samples dominated by tetrahedrally versus octahedrally coordinated species, respectively. On both silica substrates, octahedral Znads presents a single K-edge peak feature, whereas tetrahedral Znads presents two absorbance features. The energy space between the two absorbance peak features of the XANES K-edge of tetrahedral Znads is 2.4 eV for Zn on quartz and 3.2 eV for Zn on SiO2(am). Linear combination fitting of samples with a mixture of Znads complex types demonstrates that the XANES spectra of octahedral and tetrahedral Znads on silica are distinct enough for quantitative identification. These results suggest caution when deciphering Zn speciation in natural samples via linear combination approaches using a single Znads standard to represent sorption on a particular mineral surface. Correlation between XANES spectral features and prior extended X-ray absorption fine structure (EXAFS) derived coordination environments for these Znads on silica samples provides insight into Zn speciation in natural systems with XANES compatible Zn concentrations too low for EXAFS analysis.

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Empirical models for estimating the concentrations and exports of metals in rural rivers and streams

Cuthbert

Kalff

1993

Water Air Soil Pollut

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Adsorption of Fe(III), Co(II) and Zn(II) onto particulates in fresh waters on the basis of the surface complexation model I. Stabilities of metal species adsorbed on particulates

Cited by 18 publications

References 14 publications

Surface Complexation Model for the Heavy Metal Adsorption on Natural Sediment

Surface Complexation Model for the Heavy Metal Adsorption on Natural Sediment

XANES reflects coordination change and underlying surface disorder of zinc adsorbed to silica

Empirical models for estimating the concentrations and exports of metals in rural rivers and streams

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