The Malaysian Journal of Analytical Sciences Vol 16 No 2 (2012): 117 – 133

 

 

 

UPTAKE OF HEAVY METAL IONS BY CHELATING ION-EXCHANGE RESIN DERIVED FROM  P-HYDROXYBENZOIC ACID-FORMALDEHYDE-RESORCINOL: SYNTHESIS, CHARACTERIZATION AND SORPTIONDYNAMICS

 

(Pengambilan Ion Logam Berat oleh Resin Penukar Ion Terbitan Asid p-Hidroksibenzoik-Formaldehid-Resorsinol: Sintesis, Pencirian dan Dinamik Erapan)

 

Riddhish R. Bhatt¹, Bhavna A. Shah^1* and Ajay V. Shah²

 

¹Department of Chemistry,

Veer Narmad South Gujarat University, Surat-7, Guj., India.

²Department of Chemistry,

Polytechnic, Vidhyabharti Trust, Umrakh, Bardoli, Guj., India

 

*Corresponding author: rrbhatt_chem@yahoo.com

 

 

Abstract

Chelating ion-exchange resin (pHFR) has been synthesized by condensing p-hydroxybenzoic acid with formaldehyde employing resorcinol as cross linking agent at 80 ± 5 ^oC using DMF as a solvent. The resin was characterized by elemental analysis, FTIR, ¹H-NMR and XRD. The thermal analysis (TGA, DTA and DTG) was done at the heating rate of 10 ^oC/min in N₂ atmosphere. The morphology of the resin was studied by optical photographs and scanning electron micrographs (SEM) at different magnifications. The physico-chemical properties have been studied. The uptake behaviour of various metal ions viz. Ni(II), Cu(II), Zn(II), Cd(II) and Pb(II) towards pHFR resin have been studied depending on contact time, pH, metal ion concentration and temperature. The maximum uptake capacity for Ni(II), Cu(II), Zn(II), Cd(II) and Pb(II) are found 1.310, 2.304, 1.690, 1.591 and 2.020 mmol/g respectively. The selectivity order is: Cu(II)>Pb(II)>Zn(II)>Cd(II)>Ni(II). The intra-particle diffusion rate constant (K_id) and external diffusion rate constant (K_s) are calculated by Saphn-Schlunder and Weber-Morris models respectively. Equilibrium adsorption data were analyzed by Langmuir and Freundlich equations. The adsorption process follows first order kinetics and specific rate constant K_r was obtained by the application of Lagergan equation. Thermodynamic parameters viz. ∆G^o, ∆S^o and ∆H^o have also been calculated for the metal-resin systems.

 

Keywords: Chelating resin, thermal study, SEM, Thermodynamics, optical photograph, kinetics

 

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