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Copper(II) andlead(II)removal from aqueous solution by water treatment residues

Castaldi, Paola and Silvetti, Margherita and Garau, Giovanni and Demurtas, Daniela and Deiana, Salvatore Andrea (2015) Copper(II) andlead(II)removal from aqueous solution by water treatment residues. Journal of hazardous materials, Vol. 283 , p. 140-147. ISSN 0304-3894. eISSN 1873-3336. Article.

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DOI: 10.1016/j.jhazmat.2014.09.019

Abstract

In this study, we investigated the ability of Fe- and Al-based water treatment residues (Fe- and Al-WTR) to accumulate Pb(II) and Cu(II) at pH 4.5. The role of the inorganic and organic fractions of WTRs in metals sorption was also assessed. Sorption isotherms showed a higher sorption of Pb(II) by both WTRs with respect to Cu(II) (e.g. 0.105 and 0.089 mmol g−1 of Pb(II) and Cu(II) respectively sorbed by Fe-WTR). Fe-WTR revealed a stronger sorbent for both metals than Al-WTR. The amount of Pb(II) and Cu(II) sorbed by Fe-WTR was about the 69% and 63% higher than that sorbed by the Al-WTR. The organic matter of Fe- and Al-WTR contributed to about 26% and 8.5% respectively in the sorption of both metals. The sequential extraction procedure showed that the greatest amount of metals sorbed by both WTRs were tightly bound and not extractable, and this was particularly apparent for Cu(II). The FT-IR spectra indicated the formation of inner-sphere complexes between the Fe(Al)–O nucleus and Pb(II) and Cu(II). Moreover, the FT-IR spectra also suggested that the humic fraction of WTRs interacted, through the carboxylate groups, with Cu(II) and Pb(II) by forming mainly monodentate and bidentate complexes, respectively.

Item Type:Article
ID Code:10584
Status:Published
Refereed:Yes
Uncontrolled Keywords:Fe- and Al-WTR, Pb(II) and Cu(II), sorption isotherms, sequential extraction, FT-IR spectroscopy
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Elsevier
ISSN:0304-3894
eISSN:1873-3336
Deposited On:12 Jan 2015 09:52

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