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. 2012 Sep 18;9(1):7.
doi: 10.1186/1735-2746-9-7.

Synthesis and application of Amberlite xad-4 functionalized with alizarin red-s for preconcentration and adsorption of rhodium (III)

Hossein Sid Kalal  1 , Homayon Ahmad Panahi, Hassan Hoveidi, Mohammad Taghiof, Mahnaz Taheri Menderjani
Affiliations

Synthesis and application of Amberlite xad-4 functionalized with alizarin red-s for preconcentration and adsorption of rhodium (III)

Hossein Sid Kalal et al. Iranian J Environ Health Sci Eng. .

Abstract

A new chelating resin was prepared by coupling Amberlite XAD-4 with alizarin red-s through an azo spacer, characterized by infra-red spectroscopy and thermal analysis and studied for Rh(III) preconcentration using inductively coupled plasma atomic emission spectroscopy (ICP-AES) for rhodium monitoring in the environment. The optimum pH for sorption of the metal ion was 6.5. The sorption capacity was found 2.1 mg/g of resin for Rh(III). A recovery of 88% was obtained for the metal ion with 1.5 M HCl as eluting agent. Kinetic adsorption data were analyzed by adsorption and desorption times of Rh(III) on modified resin. Scat chard analysis revealed that the homogeneous binding sites were formed in the polymers. The linear regression equation was Q/C = -1.3169Q + 27.222 (R2 = 0.9239), for Rh were formed in the SPE sorbent,Kd and Qmax for the affinity binding sites were calculated to be 0.76 μmol/mL and 20.67 μmol/g, respectively. The equilibrium data and parameters of Rh(III) adsorption on modified resin were analyzed by Langmuir, Freundlich, Temkin and Redlich-Peterson models. The experimental adsorption isotherm was in good concordance with Langmuir and Freundlich models (R2 > 0.998) and based on the Langmuir isotherm the maximum amount of adsorption (qmax) was 4.842 mg/g. The method was applied for rhodium ions determination in environmental samples. with high recovery (>80%).

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Figures

Figure 1
Figure 1
(A) Langmuir, (B) Freundlich, (C) Temkin and (D) Redlich-Peterson isotherms for Rh(III) adsorption onto Alizarin red S-Amberlite XAD-4.
Figure 2
Figure 2
FT-IR spectrum of Alizarin red S-Amberlite XAD-4.
Figure 3
Figure 3
Effect of pH sorption of Rh(III) onto Alizarin red S-Amberlite XAD-4.
Figure 4
Figure 4
Effect of initial concentration of the Rh(III) in the solution on sorption capacity.
Figure 5
Figure 5
Sorption as a function of contact time.
Figure 6
Figure 6
Desorption as a function of contact time.
Figure 7
Figure 7
Scatchard plots of Rh(III) adsorption onto Alizarin red S-Amberlite XAD-4.
Figure 8
Figure 8
Isotherms obtained using the non-linear method for the adsorption of Rh (III) onto Alizarin red S -Amberlite XAD-4 at a temperature of 293 K.
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