Interaction of metal ions with montmorillonite and vermiculite

Abollino, Ornella; Giacomino, Agnese; Malandrino, Mery; Mentasti, Edoar̈do

doi:10.1016/j.clay.2007.04.002

Cited by 244 publications

(128 citation statements)

References 21 publications

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“…The sample from the B t horizon showed the highest relative sorption capacity for Pb, followed by Cu and Zn in the single element experiment, while Pb and Cu were retained on this sample at a similar rate in the competitive experiments. According to Abollino et al [43] the order of affinity of the studied metals for vermiculite are similar to that found in this study in a wide pH range (between 2.5 and 8.0). This study showed that the adsorption of divalent metal ions in these phases increases with a decrease in the facility of cations to hydrolyze, and with an increase in the atomic weight of the metal ion.…”

Section: Discussionsupporting

confidence: 71%

Single element and competitive sorption of copper, zinc and lead onto a Luvisol profile

Sipos

2009

Open Geosciences

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Abstract:The sorption parameters of Cu, Zn and Pb are related to the composition of the different genetic horizons of a Luvisol profile in batch sorption experiments. The affinities of metals towards the soil samples from different horizons followed the same sequence, e.g. Pb Cu Zn. By far the highest metal retention was found in the C k horizon due to the alkaline conditions. It is followed by the A horizon with its high organic matter content, while the lowest sorption capacity was found in the B t horizon. In the horizons free of carbonate, primarily Pb and Cu were immobilized. The studied soil can be characterized by high amount of organic matter, clay accumulation horizon, as well as calcareous subsoil. This kind of profile development makes soils able to immobilize a significant metal pollution.

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Section: Discussionsupporting

confidence: 71%

Single element and competitive sorption of copper, zinc and lead onto a Luvisol profile

Sipos

2009

Open Geosciences

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“…The metal uptake on the clay was hindered by the presence of strong complexing agents in solution and decreased with the increasing concentrations of the ligands. Furthermore, Abollino et al reported that EDTA and NTA dramatically reduced the adsorption of metal ions onto montmorillonite and vermiculite [26].…”

Section: Copper Adsorptionmentioning

confidence: 99%

Systematic study of synergistic and antagonistic effects on adsorption of tetracycline and copper onto a chitosan

Kang

Liu

Zheng

et al. 2010

Journal of Colloid and Interface Science

245

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a b s t r a c tSorption of tetracycline and copper onto chitosan is systematically investigated in this study. The sorption of tetracycline and copper occurs rapidly in the first few hours and 90% of completed uptake occurs in the first 11-12 and 6 h, respectively. The sorption equilibrium of both contaminants is established in 24 h. The solution pH largely affects the sorption of both contaminants. The tetracycline uptake increases as pH is increased from 2.8 to 5.6, and 2.5 to 7 in the absence and the presence of copper, respectively. The presence of copper significantly improves the tetracycline adsorption likely due to the formation of cationic bridging of copper between tetracycline and chitosan. The maximum adsorption capacity and the adsorption affinity constant for tetracycline dramatically increase from 53.82 to 93.04 mmol kg À1 and from 1.22 to 10.20 L mmol À1 as the copper concentration is increased from 0 to 0.5 mmol L À1. The uptake of copper increases with an increase in pH from around 3.5-6.0 in the absence and the presence of tetracycline. The presence of tetracycline decreases the copper adsorption, which may be ascribed to the competition of tetracycline with copper ions for the adsorption sites at the chitosan surface. The adsorption isothermal data of both tetracycline and copper are fit well by the Langmuir equation. The maximum adsorption capacity and adsorption affinity constant of copper ions decrease from 1856.06 to 1486.20 mmol kg À1 and from 1.80 to 1.68 L mmol À1 in the absence and the presence of tetracycline. FTIR and XPS studies reveal that amino, hydroxyl, and ether groups in the chitosan are involved in the adsorption of tetracycline and copper.

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“…Moreover, previous studies Abollino et al, 2008) demonstrated that, in this pH condition, vermiculite presents a high uptake total capacity toward the considered metals. Since the pH zpc of this clay is 8.63, at pH ~ 6 most of the silanol and aluminol groups on edges of the clay are protonated, hence the main mechanisms responsible for retention of these metals are sorption by reaction with the planar sites of the clay and consequent formation of outer-sphere complexes and introduction inside the lamellar spaces of this clay.…”

Section: Pot Experiments With Lettuce and Spinachmentioning

confidence: 99%

“…Our previous studies on synthetic solutions showed that vermiculite is a very efficient sorbent for heavy metals Abollino et al, 2008). In order to test the behaviour of this clay in a real scenario, we studied its effectiveness as soil amendment in reducing the phytoavailability of the metal pollutants.…”

Section: Pot Experiments With Lettuce and Spinachmentioning

confidence: 99%

Accumulation of heavy metals from contaminated soil to plants and evaluation of soil remediation by vermiculite

et al. 2011

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We evaluated the distribution of 15 metal ions, namely Al, Cd, Cu, Cr, Fe, La, Mn, Ni, Pb, Sc, Ti, V, Y, Zn and Zr, in the soil of a contaminated site in Piedmont (Italy). This area was found to be heavily contaminated with Cu, Cr and Ni. The availability of these metal ions was studied using Tessier's sequential extraction procedure: the fraction of mobile species, which potentially is the most harmful for the environment, was much higher than that normally present in unpolluted soils.This soil was hence used to evaluate the effectiveness of treatment with vermiculite to reduce the availability of the pollutants to two plants, Lactuca sativa and Spinacia oleracea, by pot experiments. The results indicated that the addition of vermiculite significantly reduces the uptake of metal pollutants by plants, confirming the possibility of using this clay in amendment treatments of metal-contaminated soils. The effect of plant growth on metal fractionation in soils was investigated. Finally, the sum of the metal percentages extracted into the first two fractions of Tessier's protocol was found to be suitable in predicting the phytoavailability of most of the pollutants present in the investigated soil.

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Interaction of metal ions with montmorillonite and vermiculite

Cited by 244 publications

References 21 publications

Single element and competitive sorption of copper, zinc and lead onto a Luvisol profile

Single element and competitive sorption of copper, zinc and lead onto a Luvisol profile

Systematic study of synergistic and antagonistic effects on adsorption of tetracycline and copper onto a chitosan

Accumulation of heavy metals from contaminated soil to plants and evaluation of soil remediation by vermiculite

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