Sorption of copper and lead by hydrous ferric oxide

Swallow, Kathleen C.; Hume, David N.; Morel, François M. M.

doi:10.1021/es60171a003

Cited by 158 publications

(76 citation statements)

References 15 publications

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“…At the same sorbate/sorbent ratio, metal uptake is enhanced in CPT systems as compared to the ADS system (Charlet and Manceau, 1992;Waychunas et al, 1993;Karthikeyan et al, 1997). However, to illustrate the complexity of the metastable system and metal specific nature, CPT and ADS sorption edges with Zn 2+ on iron oxyhydroxide (Crawford et al, 1993) and Cu 2+ on hydrous aluminum hydroxide (Karthikeyan et al, 1997) show no appreciable differences, and contradictory experimental results for CPT-ADS have been found for Cu 2+ sorption onto iron oxyhydroxide (Swallow et al, 1980;Karthikeyan et al, 1997).…”

Section: Introductionmentioning

confidence: 98%

“…Although numerous Pb 2+ adsorption experiments have already been conducted (e.g., Gadde and Laitinen, 1973;Kinniburgh et al, 1976;Swallow et al, 1980;Balistrieri and Murray, 1982;Hayes and Leckie, 1986;Rose and Bianchimosquera, 1993;Lutzenkirchen, 1997;Trivedi et al, 2003), studies of coprecipitation are scarce and sporadic (e.g, Ford et al, 1997Ford et al, , 1999Mcbride, 1998, 2001). Pokrovsky et al (2006a,b) studied coprecipitation of heavy metals including Pb with natural Fe oxy(-hydr)oxides colloids and Ge coprecipitation with solid Fe oxy(hydr)oxides and its aging.…”

Section: Introductionmentioning

confidence: 99%

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Lead coprecipitation with iron oxyhydroxide nano-particles

Lü

Nuhfer

Kelly

et al. 2011

Geochimica et Cosmochimica Acta

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Pb 2+ and Fe 3+ coprecipitation was studied with sorption edge measurements, desorption experiments, sorbent aging, High Resolution Transmission and Analytical Electron Microscopy (HR TEM-AEM), and geochemical modeling. Companion adsorption experiments were also conducted for comparison. The macroscopic chemical and near atomic scale HRTEM data supplemented our molecule scale analysis with EXAFS (Kelly et al., 2008). Coprecipitation of Pb 2+ with ferric oxyhydroxides occurred at $pH 4 and is more efficient than adsorption in removing Pb 2+ from aqueous solutions at similar sorbate/sorbent ratios and pH. X-ray Diffraction (XRD) shows peaks of lepidocrocite and two additional broad peaks similar to fine particles of 2-line ferrihydrite (2LFh). HRTEM of the Pb-Fe coprecipitates shows a mixture of 2-6 nm diameter spheres and 8-20 by 200-300 nm needles, both uniformly distributed with Pb 2+ . Geochemical modeling shows that surface complexation models fit the experimental data of low Pb:Fe ratios when a high site density is used. Desorption experiments show that more Pb 2+ was released from loaded sorbents collected from adsorption experiments than from Pb to Fe coprecipitates at dilute EDTA concentrations. Desorbed Pb 2+ versus dissolved Fe 3+ data show a linear relationship for coprecipitation (CPT) desorption experiments but a parabolic relationship for adsorption (ADS) experiments.Based on these results, we hypothesize that Pb 2+ was first adsorbed onto the nanometer-sized, metastable, iron oxyhydroxide polymers of 2LFh with domain size of 2-3 nm. As these nano-particles assembled into larger particles, some Pb 2+ was trapped in the iron oxyhydroxide structure and re-arranged to form solid solutions. Therefore, the CPT contact method produced more efficient removal of Pb 2+ than the adsorption contact method, and Pb 2+ bound in CPT solids represent a more stable sequestration of Pb 2+ in the environment than Pb 2+ adsorbed on iron oxyhydroxide surfaces.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Lead coprecipitation with iron oxyhydroxide nano-particles

Lü

Nuhfer

Kelly

et al. 2011

Geochimica et Cosmochimica Acta

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“…Kwong and Niyogi, 2009). Sorption of several metals to hydrous ferric oxide (Johnson, 1986;Hem, 1977;Swallow et al, 1980) and manganese oxide (Loganathan and Burau, 1973) has been studied. Another factor affecting toxicity of metals is alkalinity (Köck et al, 1995).…”

Section: Introduction Synopsismentioning

confidence: 99%

Bioaccumulation of non-essential trace metals in tissues and organs of <i>Clarias gariepinus</i> (sharptooth catfish) from the Vaal River system – strontium, aluminium, lead and nickel

Crafford

Avenant‐Oldewage

2010

WSA

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This is the first paper reporting on results obtained in a metal bioaccumulation study in the Vaal River system. It discusses concentrations of four non-essential elements (strontium, aluminium, lead and nickel) in water, sediment and various fish tissues. A second paper will report on concentration levels of the remaining five essential trace metals (chrome, copper, iron, manganese and zinc) studied. While heavy metals did accumulate in C. gariepinus tissues, no clear trends emerged with regard to differences between localities (Vaal Dam and Vaal River Barrage) or surveys. The highest non-essential element metal concentrations were generally recorded in gill (filaments and arches), followed by muscle, liver and lastly skin. This general trend appears to be in agreement with trends observed by other workers and reported in the literature. Variability in tissue metal concentrations in C. gariepinus within locality and seasons observed in this study is also reflected in results from available literature. This accentuates the importance of factors that influence the concentrations and bioavailability of trace metals.

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“…These adsorption studies showed that heavy metal cations were specifically adsorbed, compared with other divalent cations, and that the adsorption of heavy metal cations was affected by the aging and the types of hydrated oxides and oxides of iron and aluminum (16,18). However,little attention has been paid to their degree of crystallinity.…”

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confidence: 99%