Multiple-site adsorption of Cd, Cu, Zn, and Pb on amorphous iron oxyhydroxide

Benjamin, Mark M.; Leckie, James O.

doi:10.1016/0021-9797(81)90063-1

Cited by 924 publications

(480 citation statements)

References 22 publications

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“…Specific adsorption of metals on iron oxyhydroxides can take place within the surface layer or inside the oxide (Jenne, 1968;Benjamin and Leckie, 1981;Brümmer, 1986), but mainly occurs in the surface areas (Benjamin and Leckie, 1981;Bleam and McBride, 1985;McBride, 1989). The data support this statement: the ratio between the NH 4 OAc-EDTA-extractable portion of the reducible fraction and the total reducible fraction is higher for metals other than Fe.…”

Section: Reducible Fractionmentioning

confidence: 91%

Impact of single reagent extraction using NH4OAc-EDTA on the solid phase distribution of metals in a contaminated dredged sediment

Tack

Verloo

1996

Science of The Total Environment

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The solid phase distribution of metals in a contaminated dredged sediment as affected by a single reagent extraction (0.5 mol/L NH 4 OAc + 0.02 mol/L EDTA) was studied. A sediment was dried and portions were heated at 250°C and 450°C. From each treatment, a portion was extracted with NH 4 OAc-EDTA. Both the extracted and the unextracted portions were then subjected to a sequential fractionation.NH 4 OAc-EDTA extraction decreased both the acid extractable and the reducible fractions. The oxidizable and residual fractions were not significantly affected. Larger portions of the acid extractable and reducible fractions were extracted with NH 4 OAc-EDTA when the sediment was previously heated at 250°C. After heating the sediment at 450°C the NH 4 OAc-EDTA-extractable portions decreased.Fractionation procedures can provide reliable information on the chemical associations of pollutants in sediments. To estimate short and medium term metal availability, single reagent leaching tests appear more appropriate.

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Section: Reducible Fractionmentioning

confidence: 91%

Impact of single reagent extraction using NH4OAc-EDTA on the solid phase distribution of metals in a contaminated dredged sediment

Tack

Verloo

1996

Science of The Total Environment

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“…The negatively charged surface at pH > IEP favors Cd(II) adsorption due to strong electrostatic attraction. Thus, the change of surface charge of nZVI may also have contributed to the increased removal of Cd(II); and (3) high pH, especially above 7, could also improve Cd adsorption on iron oxide (Benjamin and Leckie, 1981). Comparing the results of these two series of experiments, the enhanced Cd(II) removal capacity in the presence of nitrate most likely resulted from elevated solution pH.…”

Section: Further Investigation On the Role Of Nitrate In Enhanced Cd(mentioning

confidence: 98%

Simultaneous removal of cadmium and nitrate in aqueous media by nanoscale zerovalent iron (nZVI) and Au doped nZVI particles

et al. 2014

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a b s t r a c tNanoscale zerovalent iron (nZVI) has demonstrated high efficacy for treating nitrate or cadmium (Cd) contamination, but its efficiency for simultaneous removal of nitrate and Cd has not been investigated. This study evaluated the reactivity of nZVI to the cocontaminants and by-product formation, employed different catalysts to reduce nitrite yield from nitrate, and examined the transformation of nZVI after reaction. Nitrate reduction resulted in high solution pH, negatively charged surface of nZVI, formation of Fe 3 O 4 (a stable transformation of nZVI), and no release of ionic iron. Increased pH and negative charge contributed to significant increase in Cd(II) removal capacity (from 40 mg/g to 188 mg/g) with nitrate present. In addition, nitrate reduction by nZVI could be catalyzed by Cd(II): while 30% of nitrate was reduced by nZVI within 2 h in the absence of Cd(II), complete nitrate reduction was observed in the presence of 40 mg-Cd/L due to the formation of Cd islands (Cd(0) and CdO) on the nZVI particles. While nitrate was reduced mostly to ammonium when Cd(II) was not present or at Cd(II) concentrations ! 40 mg/L, up to 20% of the initial nitrate was reduced to nitrite at Cd(II) concentrations < 40 mg/L. Among nZVI particles doped with 1 wt. % Cu, Ag, or Au, nZVI deposited with 1 wt. % Au reduced nitrite yield to less than 3% of the initial nitrate, while maintaining a high Cd(II) removal capacity.© 2014 Elsevier Ltd. All rights reserved. Available online at www.sciencedirect.com ScienceDirect journal homepage: www.else vier.com/locate /wa tres w a t e r r e s e a r c h 6 3 ( 2 0 1 4 ) 1 0 2 e1 1 1http://dx

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“…Amorphous Fe oxyhydroxide phase is well recognized for its scavenging properties of heavy metals in the surface environment (Hall et al, 1996) (Benjamin and Leckie, 1981;Forstner and Wittmann, 1983;Bilinski et al, 1991). Relatively high affinity of Pb (62 % of total), Cu (48 % of total), Cr (45 % of total), Co (31% of total), Zn (30 % of total) and Ni (30 % of total) for amorphous Fe oxyhydroxide minerals was observed in Buriganga river sediments (Table 4).…”

Section: Amorphous Fe Oxyhydroxide Fractionmentioning

confidence: 99%

Heavy metals contamination in water and sediments of an urban river in a developing country

Mohiuddin

Ogawa

Zakir

et al. 2011

Int. J. Environ. Sci. Technol.

211

101

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Water and sediment samples were collected from 20 location of the Buriganga river of Bangladesh during Summer and Winter 2009 to determine the spatial distribution, seasonal and temporal variation of different heavy metal contents. Sequential extraction procedure was employed in sediment samples for the geochemical partitioning of the metals. Total trace metal content in water and sediment samples were analyzed and compared with different standard and reference values. Concentration of total chromium, lead, cadmium, zinc, copper, nickel, cobalt and arsenic in water samples were greatly exceeded the toxicity reference values in both season. Concentration of chromium, lead, copper and nickel in sediment samples were mostly higher than that of severe effect level values, at which the sediment is considered heavily polluted. On average 72 % chromium, 92 % lead, 88 % zinc, 73 % copper, 63 % nickel and 68 % of total cobalt were associated with the first three labile sequential extraction phases, which portion is readily bioavailable and might be associated with frequent negative biological effects. Enrichment factor values demonstrated that the lead, cadmium, zinc, chromium and copper in most of the sediment samples were enriched sever to very severely. The pollution load index value for the total area was as high as 21.1 in Summer and 24.6 in Winter season; while values above one indicates progressive deterioration of the sites and estuarine quality. The extent of heavy metals pollution in the Buriganga river system implies that the condition is much frightening and may severely affect the aquatic ecology of the river.

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Multiple-site adsorption of Cd, Cu, Zn, and Pb on amorphous iron oxyhydroxide

Cited by 924 publications

References 22 publications

Impact of single reagent extraction using NH4OAc-EDTA on the solid phase distribution of metals in a contaminated dredged sediment

Impact of single reagent extraction using NH4OAc-EDTA on the solid phase distribution of metals in a contaminated dredged sediment

Simultaneous removal of cadmium and nitrate in aqueous media by nanoscale zerovalent iron (nZVI) and Au doped nZVI particles

Heavy metals contamination in water and sediments of an urban river in a developing country

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