Sorption of Cd–cysteine complexes by kaolinite

Benincasa, Emanuele; Brigatti, Maria Franca; Malferrari, Daniele; Medici, Luca; Poppi, Luciano

doi:10.1016/s0169-1317(01)00100-4

Cited by 13 publications

(3 citation statements)

References 16 publications

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“…Unlike many transition metals, which precipitate as hydroxides at pH values common in soils and surface waters, cadmium hydroxide is very soluble and its concentration in aqueous solutions is not appreciably limited at pH values lower than pH 10 [6]. Recent studies on Cd(II) [7][8][9][10][11][12][13] addressed its sorption on soil minerals, also when enhanced by the introduction of different functional groups on the mineral surface, such as clay minerals with metal complexing groups [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Sorption kinetics and chemical forms of Cd(II) sorbed by thiol-functionalized 2:1 clay minerals

Malferrari

Brigatti

Laurora

et al. 2007

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Sorption kinetics and chemical forms of Cd(II) sorbed by thiol-functionalized 2:1 clay minerals

Malferrari

Brigatti

Laurora

et al. 2007

Journal of Hazardous Materials

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“…Previous studies have found kaolinite to be a weak amino acid adsorbent (Jackson, 1970) that interacts with -NH 3 + and -COOH groups from cysteine through -OH groups from octahedral basal surfaces and broken hydrogen bonds (Ma and Eggleton, 1999;Benincasa et al, 2002;Lagaly et al, 2006;Petrović et al, 2012;Theng, 2012). In this study, the organic coal matrix may have also interacted with the amino acid, since bituminous coals present some adsorptive properties similar to those of activated coal (Teng, et al, 1998;Linares-Solano et al, 2000).…”

Section: Discussionmentioning

confidence: 70%

EFFECT OF Acidithiobacillus thiooxidans-CYSTEINE INTERACTIONS ON PYRITE BIOOXIDATION BY Acidithiobacillus ferrooxidans IN THE PRESENCE OF COAL COMPOUNDS

Pineda

Godoy

2019

Braz. J. Chem. Eng.

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This study evaluated the biooxidation of pyrite contained in a Colombian coal (2.38 mm < particle size < 0.50 mm). The variables were cysteine concentration (0-600 mg/L) and culture type (pure Acidithiobacillus ferrooxidans (ATCC 23270) and a consortium of Acidithiobacillus thiooxidans (ATCC 15494) and Acidithiobacillus ferrooxidans). Pyrite oxidation for the assays without cysteine was 31.14% after 12 days. In the presence of pure A. ferrooxidans, oxidation increased by 8.18% in the assays containing 60 mg Cys/L. In contrast, the counterpart using the consortium exhibited a significant increase in redox potential, which improved oxidation by 28.44%. Since all the assays had a similar kaolinite removal (around 31.45%), and the experiments without cysteine did not show differences in behaviour, the A. thiooxidans-cysteine interactions might have been responsible for increasing Fe 3+ regeneration, alleviating the toxic effect of Al 3+ ion dissolution, thus improving pyrite oxidation. The consortium-cysteine-coal interactions contrasted with those proposed by other authors for A. ferrooxidans-cysteine-pure pyrite and A. thiooxidans-cysteine, indicating different metabolic pathways in the presence of inorganic and organic coal matrices. On the other hand, the biooxidation rate decreased for both cultures in the presence of 600 mg Cys/L, showing similar inhibition to that reported in the literature.

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“…Hg(II) may also form a bidentate complex with cysteine on kaolinite via two coordination groups. Cysteine may complex with divalent metal ion in three bidentate coordination modes, -NH 3 + and -SH, -COO − and -SH, or -NH 3 + and -COO − (Benincasa et al, 2002). But the first mode is most probable (Benincasa et al 2002;Li and Manning 1955) and it would make cysteine bind to kaolinite via its −COO − group (SI Table 2, Fig.…”

Section: Isotherms Of the Adsorption Of Hg(ii) On Kaolinitementioning

confidence: 99%

Effect of carboxylic and thiol ligands (oxalate, cysteine) on the kinetics of desorption of Hg(II) from kaolinite

Senevirathna

Zhang

2010

Water Air Soil Pollut

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Sorption and desorption of Hg(II) on clay minerals can impact the biogeochemical cycle and bio-uptake of Hg in the environment. We studied the kinetics of the desorption of Hg(II) from kaolinite as affected by oxalate and cysteine, representing the ligands with carboxylic and thiol groups of different affinities for Hg(II). The effects of pH (3, 5, and 7), ligand concentration (0.25 and 1.0 mM), and temperature (15°C, 25°C, and 35°C) on the Hg(II) desorption were investigated through desorption kinetics. Our study showed that the Hg(II) desorption was pH dependent. In the absence of any organic ligand, >90% of the previously adsorbed Hg(II) desorbed at pH 3 within 2 h, compared to <10% at pH 7. Similar results were observed in the presence of oxalate, showing that it hardly affected the Hg(II) desorption. Cysteine inhibited the Hg(II) desorption significantly at all the pH tested, especially in the first 80 min with the desorption less than 20%, but the inhibition of the desorption appeared to be less prominent afterwards. The effect of the ligand concentration on the Hg(II) desorption was small, especially in the presence of oxalate. The effect of temperature on the Hg(II) desorption was nearly insignificant. The effect of the organic acids on the Hg(II) sorption and desorption is explained by the formation of the ternary surface complexes involving the mineral, ligand, and Hg(II). The competition for Hg(II) between the cysteine molecules adsorbed on the particle surfaces and in the solution phase probably can also affect the Hg(II) desorption.

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Sorption of Cd–cysteine complexes by kaolinite

Cited by 13 publications

References 16 publications

Sorption kinetics and chemical forms of Cd(II) sorbed by thiol-functionalized 2:1 clay minerals

Sorption kinetics and chemical forms of Cd(II) sorbed by thiol-functionalized 2:1 clay minerals

EFFECT OF Acidithiobacillus thiooxidans-CYSTEINE INTERACTIONS ON PYRITE BIOOXIDATION BY Acidithiobacillus ferrooxidans IN THE PRESENCE OF COAL COMPOUNDS

Effect of carboxylic and thiol ligands (oxalate, cysteine) on the kinetics of desorption of Hg(II) from kaolinite

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