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Detection of trace amounts of Pb(II) by schiff base-chitosan-grafted multiwalled carbon nanotubes

  • Physical Chemistry of Nanoclusters and Nanomaterials
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Abstract

A simple, highly sensitive, accurate and selective method for determination of trace amounts of Pb(II) in water samples is presented. A novel Schiff base-chitosan-grafted multiwalled carbon nanotubes (S-CS-MWCNTs) solid-phase extraction adsorbent was synthesized by covalently grafting a Schiff base-chitosan (S-CS) onto the surfaces of oxidized MWCNTs. The stability of a chemically (S-CS-MWCNTs) especially in concentrated hydrochloric acid which was then used as a recycling and preconcentration reagent for further uses of (S-CS-MWCNTs). The method is based on selective chelation of Pb(II) on surfactant coated C18, modified with a Schiff base-chitosan-grafted multiwalled carbon nanotubes (S-CS-MWCNTs). The retained ions were then eluted with 4 mL of 4 M nitric acid and determined by flame atomic absorption spectrometry (FAAS) at 283.3 nm for Pb. The influence of flow rates of sample and eluent solutions, pH, break-through volume, effect of foreign ions on chelation and recovery were investigated. 1.5 g of surfactant coated C18 adsorbs 40 mg of the Schiff s base which in turn can retain 15.0 ± 0.9 mg of each of the two ions. The limit of detection (3σ) for Pb(II) was found to be 3.20 ng L−1. The enrichment factor for both ions are 100. The mentioned method was successfully applied on determination of lead in different water samples. The ions were also speciated by means of three columns system.

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  1. Department of Chemistry, Varamin (Pishva) Branch Islamic Azad University, Varamin, Iran

    Ali Moghimi

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  1. Ali Moghimi
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Moghimi, A. Detection of trace amounts of Pb(II) by schiff base-chitosan-grafted multiwalled carbon nanotubes. Russ. J. Phys. Chem. 87, 1203–1209 (2013). https://doi.org/10.1134/S0036024413070388

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