Adsorption and desorption of Cu at high equilibrium concentrations by soil and clay samples from Bulgaria

Atanassova, Irena

doi:10.1016/s0269-7491(99)80003-7

Cited by 46 publications

(27 citation statements)

References 14 publications

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“…Another 20 mL of extracting solution was added, and the sample was shaken for 48 h, following the procedure described previously. The period of 48 h is sufficient to guarantee the equilibrium of the samples (Atanassova, 1995). The second extraction was performed to extract any copper which may not have been previously desorbed.…”

Section: Methodsmentioning

confidence: 99%

Copper adsorption in tropical oxisols

Silveira

Alleoni

2003

Braz. arch. biol. technol.

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Section: Methodsmentioning

confidence: 99%

Copper adsorption in tropical oxisols

Silveira

Alleoni

2003

Braz. arch. biol. technol.

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“…The distribution coefficient (Kd) of Cu 2+ between soil and the solution reflects the overall affinity between Cu 2+ and the surfaces of soil constituents (Atanassova 1995;Wang 1995). The KTP soil had a slightly higher log 10 Kd than the TTD soil for all the electrolyte media used (Figure 2).…”

Section: Soilsmentioning

confidence: 99%

Effects of Anions on the Capacity and Affinity of Copper Adsorption in Two Variable Charge Soils

Huang

et al. 2005

Biogeochemistry

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Effects of nitrate ðNO À 3 Þ, chloride (Cl À ), sulfate ðSO 2À 4 Þ, and acetate (Ac À ) on Cu 2+ adsorption and affinity of the adsorbed Cu 2+ were evaluated in two Fe and Al enriched variable charge soils from Southern China. The maximum adsorption of Cu 2+ (M, a parameter from the Langmuir isotherm model) in the presence of different anions decreased in the order Cl À > Ac À > NO À 3 > SO 2À 4 for both soils. The clayey loamy soil (mixed siliceous thermic Typic Dystrochrept, TTD), developed on the Arenaceous rock, adsorbed less Cu 2+ than the clayey soil (kaolinitic thermic Plinthudults, KTP), derived from the Quaternary red earths, regardless of anion type present in the medium. The affinity of adsorbed Cu 2+ to both soils could be characterized by the Kd (distribution coefficient) values and successive extraction of the adsorbed Cu 2+ with 1-mol NH 4 Ac L À1 . The log 10 Kd value was smaller for the TTD soil than for the KTP soil and decreased in the order of Cl À > NO À 3 > SO 2À 4 > Ac À at low initial Cu 2+ concentrations ( £ 40 mg Cu 2+ L À1 ), whereas at 80 mg Cu 2+ L À1 , the log 10 Kd value was similar for NO À 3 , SO 2À 4 , and Ac À , but was slightly higher for Cl À . Complete extraction of Cu 2+ adsorbed in the presence of Ac À was achieved. Influence of NO À 3 and SO 2À 4 on the affinity of adsorbed Cu 2+ was similar, but the effects of Cl À depended on the initial Cu 2+ concentrations. The extracted percentage of the adsorbed Cu 2+ in the presence of NO À 3 or SO 2À 4 increased with increasing Cu 2+ adsorption saturation. The presence of Cl À , NO À 3 , or SO 2À 4 markedly decreased the equilibrium solution pH for both soils with increasing initial Cu 2+ concentrations, and the delta pH values at the highest Cu 2+ level were 0.5, 0.63, and 0.55 U for the TTD soil and 0.79, 0.84, and 0.93 U for the KTP soil, respectively for the three anions. The presence of Ac À had a minimal influence on the equilibrium solution pH because of the buffering nature of the NaAc/HAc medium which buffered the released protons. The effects of anions on Cu 2+ adsorption and affinity of the adsorbed Cu 2+ were dependent on anion types and were apparently related to the altered surface properties caused by anion adsorption and/or the formation of anion-Cu 2+ complexes.Abbreviations: AAS -atomic absorption spectrometry; Ac À -acetate; CEC -cation exchange capacity at pH 7.0; Cl À -chloride; Freundlich equation -q ¼ k F C n , where q is the amount of adsorbed Cu 2+ , k F is a constant related to total adsorption capacity of the soils.; Kd -distribution coefficient; KTP soil -a soil of kaolinitic thermic Plinthudults; Langmuir equation -q ¼ (k L MC)/(l+k L C), where q is the amount of adsorbed Cu 2+ , M is the maximum adsorption of Cu 2+ , and k L is a constant related to binding energy; NaAc/HAc medium -a buffering medium consisting of sodium acetate and acetic acid; NH 4 Acammonium acetate; NO À 3 -nitrate; rcf -rotational centrifugal force; SO 2À 4 -sulfate; TTD soil -a soil of mixed siliceous thermic typic Dystrochrept B...

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“…In the literature, numerous studies about the sorption of Cr(III) and Cu(II) ions onto different sorbents are reported. Also, vermiculite was chosen as a sorbent for other metals [7,[10][11][12][13]. The objective of the present work was to study the adsorption characteristics of Cr(III) and Cu(II) ions from aqueous solution using pure clay mineral, vermiculite.…”

Section: Introductionmentioning

confidence: 99%

Vermiculite as an exchanger for copper(II) and Cr(III) ions, kinetic studies

Badawy

El-Bayaa

AlKhalik

2010

Ionics

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The adsorption of Cu(II) and Cr(III) ions by pure clay mineral, vermiculite, was examined in aqueous solution with respect to the adsorbent dose, initial metal ion concentration, pH, and contact time. The studies showed that vermiculite can be used as an adsorbent material for the moderate removal of Cr(III) and Cu(II) from aqueous solutions. Lagergren first-order, pseudo-second-order, and intraparticle diffusion models were used to describe the kinetic data. The kinetics of adsorption indicates that the process fitted well the intraparticle diffusion model.

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Adsorption and desorption of Cu at high equilibrium concentrations by soil and clay samples from Bulgaria

Cited by 46 publications

References 14 publications

Copper adsorption in tropical oxisols

Copper adsorption in tropical oxisols

Effects of Anions on the Capacity and Affinity of Copper Adsorption in Two Variable Charge Soils

Vermiculite as an exchanger for copper(II) and Cr(III) ions, kinetic studies

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