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EDTA modified LDHs as Cu2+ scavengers: removal kinetics and sorbent stability. | LitMetric

EDTA modified LDHs as Cu2+ scavengers: removal kinetics and sorbent stability.

J Colloid Interface Sci

INFQC, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina.

Published: March 2009

EDTA modified layered double hydroxides (LDHs) were investigated as potential sorbents to remediate heavy metals pollution. The polidentate ligand was introduced by an exchange method in a Zn-Al-LDH, which takes place with partial erosion of the layers, causing the intercalation of [Zn(EDTA)](2-) complex instead of the ligand. [Cu(H(2)O)(6)](2+) cation was selected as a model cation to study the uptake mechanism, exploring the elimination kinetics from the first minutes up to the steady state. A flow injection analysis system coupled to an amperometric detector (FIA-AM) was applied to perform fast and reliable [Cu(H(2)O)(6)](2+) determinations in monodisperse solid-aqueous solution systems. Furthermore, the sorbent stability was determined as a function of the pH and the nitrate concentration. The [Cu(H(2)O)(6)](2+) elimination is produced by an exchange reaction with [Zn(EDTA)](2-) anions placed either in the solid interlayer or in the aqueous solution, this last being released from the sorbent. Additional [Cu(H(2)O)(6)](2+) removal is produced by Cu(OH)(2) precipitation at high copper concentrations due to the LDHs high pH buffering capacity. The sorbent removes [Cu(H(2)O)(6)](2+) with high affinity in a wide concentration range. The elimination process reaches equilibrium in less than 30 min and leaves metal cation concentrations lower than 0.05 ppm in the supernatants.

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http://dx.doi.org/10.1016/j.jcis.2008.11.045DOI Listing

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