Affiliation:
1. Nuclear Chemistry Division, Pakistan Institute of Nuclear Science and Technology (PINSTECH), P.O. Nilore, Islamabad, Pakistan
Abstract
The sorption behaviour of a 2.46 • 10−5M solution of Hg(II) on 4-(2-pyridylazo)resorcinol (PAR)-loaded polyurethane foam (PUF) was investigated. Optimum sorption was observed from acetate medium at pH 6 with the maximum equilibration time being 30 min. The kinetic data indicated an intraparticle diffusion process with sorption being first order. The rate constant k was 0.053 min−1. The classical Freundlich and Langmuir adsorption isotherms were tested. The Freundlich constants 1/n and Kfwere determined as 0.40 and 1.07 • 10−3mol/g, respectively, and the Langmuir constants ‘M’ and ‘b’ were 3.84 • 10−5mol/g and 3.5 • 104dm3/mol, respectively. A sorption free energy (E) of 12.9 kJ/mol indicated chemisorption. The numerical values of the thermodynamic parameters ΔH, ΔS and ΔG indicated that sorption was spontaneous and exothermic in nature. The Scatchard equation was tested as a means of evaluating the binding sites of PUF with Hg(II). The stability constants for sorption were determined and the sorption mechanism was discussed.
Subject
Surfaces and Interfaces,General Chemical Engineering,General Chemistry
Cited by
7 articles.
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