Competitive sorption of heavy metal by soils. Isotherms and fractional factorial experiments

Echeverría, Jesús C.; Morera, M T; Mazkiarán, C.; Garrido, Julián

doi:10.1016/s0269-7491(98)00038-4

Cited by 205 publications

(124 citation statements)

References 26 publications

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“…1). The shape of this isotherm reflects surface adsorption or complexation mechanism (Echeverria et al, 1998). XRD analysis did not show any mineral formation in the solid of Cu or Zn reaction with phosphate ( Fig.…”

Section: Analysis Methodsmentioning

confidence: 91%

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Mechanisms of lead, copper, and zinc retention by phosphate rock

Cao

2004

Environmental Pollution

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''Capsule'': Phosphate-induced formation of fluoropyromorphite is primarily responsible for Pb immobilization by phosphate rock, whereas Cu and Zn retention is mainly attributable to the surface adsorption or complexation. AbstractThe solideliquid interface reaction between phosphate rock (PR) and metals (Pb, Cu, and Zn) was studied. Phosphate rock has the highest affinity for Pb, followed by Cu and Zn, with sorption capacities of 138, 114, and 83.2 mmol/kg PR, respectively. In the PbeCueZn ternary system, competitive metal sorption occurred with sorption capacity reduction of 15.2%, 48.3%, and 75.6% for Pb, Cu, and Zn, respectively compared to the mono-metal systems. A fractional factorial design showed the interfering effect in the order of Pb O Cu O Zn. Desorption of Cu and Zn was sensitive to pH change, increasing with pH decline, whereas Pb desorption was decreased with a strongly acidic TCLP extracting solution (pH ¼ 2:93). The greatest stability of Pb retention by PR can be attributed to the formation of insoluble fluoropyromorphite [Pb 10 (PO 4 ) 6 F 2 ], which was primarily responsible for Pb immobilization (up to 78.3%), with less contribution from the surface adsorption or complexation (21.7%), compared to 74.5% for Cu and 95.7% for Zn. Solution pH reduction during metal retention and flow calorimetry analysis both supported the hypothesis of retention of Pb, Cu, and Zn by surface adsorption or complexation. Flow calorimetry indicated that Pb and Cu adsorption onto PR was exothermic, while Zn sorption was endothermic. Our research demonstrated that PR can effectively remove Pb from solutions, even in the presence of other heavy metals (e.g. Cu, Zn).

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Section: Analysis Methodsmentioning

confidence: 91%

“…Metal sorption is a competitive process between metals in solution and those sorbed onto the solid surface (Echeverria et al, 1998;Harter, 1992). Conse quently, solution metal composition strongly affects metal retention onto solid surfaces.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of lead, copper, and zinc retention by phosphate rock

Cao

2004

Environmental Pollution

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“…Thus, coulombic-type interactions are favored with other charged species or surfaces for Ca 2þ and Cd 2þ . Echeverria et al (1998) and Yong and Phadungchewit (1993) reported on the competitive sorption of various heavy metals in mineral and soil systems. They reported decreased sorption of Cd, Cu, Pb, and Zn when these metals were added together compared to when they were added alone to soils.…”

Section: Pb CD and Ca Interactionsmentioning

confidence: 99%

Sequential sorption of lead and cadmium in three tropical soils

Appel

Lena

Rhue

et al. 2008

Environmental Pollution

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The sorption and desorption of Pb and Cd in tropical soils is strongly influenced by the order in which these metals enter the soil environment. AbstractIt is important to examine mechanisms of Pb and Cd sorption in soils to understand their bioavailability. The ability of three tropical soils to retain Pb, Cd, and Ca was evaluated. The objectives of this study were to (1) determine the extent to which soil sorption sites are metal specific, (2) investigate the nature of reactions between metals and soil surfaces, and (3) identify how metals compete for sorption sites when they are introduced to soils sequentially or concurrently. Lead was shown to be much less exchangeable than Cd and inhibited Cd sorption. Cadmium had little effect on Pb sorption, though both Ca and Cd inhibited the adsorption of Pb at exchange sites. Lead appears to more readily undergo innersphere surface complexation with soil surface functional groups than either Cd or Ca. Thus, regardless of when Pb is introduced to a soil, it should be less labile than Cd.

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“…With the current awareness of heavy metals as very toxic contaminants there have been many studies considering adsorption by solid surfaces as the most important mechanism for controlling metal content in soil solution and natural waters (Echeverria, Morera, Mazkiaran, & Garido, 1998;Bradl, 2004;Appel, Ma, Rhue, & Reve 2008;Javaid, Bajwa, Shafique, & Anwar, 2011). The most important chemical processes affecting the behavior and bioavailability of heavy metals in soils are those concerned with sorption mechanisms of metals from liquid phase onto solid phase (Rybicka, Calmano, & Breeger, 1995;Covelo, Andrade, & Vega, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…In order to describe the adsorption characteristics of adsorbates, experimental equilibrium data are most frequently modeled by the relationships developed by Freundlich and Langmuir (Echeverria et al, 1998;Limousin, Gaudet, Charlet, Szeknect, Barthes & Krimissa, 2007;Gomes, Cavaco, Quina, & Gando-Ferreira, 2010). Usually, the experimental approach involving sorption of sorbates onto sorbents is to gather data and produce adsorption isotherms, which are in turn interpreted to explain adsorption process.…”

Section: Introductionmentioning

confidence: 99%

Sorption of Heavy Metals by Ferralic-Arenosol and Vertic-Luvisol: A Comparative Isothermal Study

Mosekiemang¹,

Dikinya²,

Toteng³

2014

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Modeling of sorption data is essential for characterizing retention of heavy metals by the soil matrices as well as to predict the fate of heavy metals in the environment. We carried out a study to evaluate adsorption characteristics of metallic ions (Cr 3+ , Pb 2+ and Cu 2+ ) as sole sorbates as well as in coexistence onto clay extracts of Vertic-Luvisol and Ferralic-Arenosol, the generally under-researched yet wide-spread semi-arid soils. Additionally, sorption kinetics of these heavy metals was evaluated in these soils. Equilibrium sorption data for both non-competitive and competitive metal systems were found to obey the Langmuir isotherm. Overall metal loading capacity was higher in Vertic-Luvisol than Ferralic-Arenosol whereas metal-wise affinity to binding sites favoured sorption of Cr 3+ over Pb 2+ and Cu 2+ in that order. Contrary to the hypothesis of this study, the preferential sorption process was found to be driven by cationic properties as opposed to soil properties. Adsorption of metallic ions onto soils was significantly reduced in competitive systems than non-competitive systems, a phenomenon attributable to the antagonistic effects of coexisting species. Cr 3+ suppressed sorption of Pb 2+ and Cu 2+ on both soils as validated by the competitive adsorption capacity ratios which were < 1 in all instances where Cr 3+ coexisted with either one of Pb 2+ or Cu 2+ . The adsorption kinetics of metal ions in both soils followed the pseudo-second-order rate law, suggesting chemical sorption as the rate-limiting step of the adsorption process.

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Competitive sorption of heavy metal by soils. Isotherms and fractional factorial experiments

Cited by 205 publications

References 26 publications

Mechanisms of lead, copper, and zinc retention by phosphate rock

Mechanisms of lead, copper, and zinc retention by phosphate rock

Sequential sorption of lead and cadmium in three tropical soils

Sorption of Heavy Metals by Ferralic-Arenosol and Vertic-Luvisol: A Comparative Isothermal Study

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