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Download fileSelective Separation of Aluminum from Biological and Environmental Samples Using Glyoxal-bis(2-hydroxyanil) Functionalized Amberlite XAD-16 Resin: Kinetics and Equilibrium Studies
journal contribution
posted on 2013-04-10, 00:00 authored by Aminul Islam, Hilal Ahmad, Noushi Zaidi, Sudesh YadavA new glyoxal-bis(2-hydroxyanil)
anchored Amberlite XAD-16 chelating
resin was synthesized and characterized by elemental analyses and
scanning electron microscopy along with energy dispersive X-ray spectroscopy
(SEM/EDAX), infrared spectral, and thermal studies. The resin was
found to selectively bind aluminum in aqueous medium over a large
number of competitive cations, at pH 9. Experimental conditions, for
effective sorption of Al(III) were optimized systematically and were
found to have fast kinetics (t1/2 10 min),
high preconcentration flow rate (5.0 mL min–1),
very high sorption capacity (24.28 mg g–1), regenerability
up to 66 sample loading/elution cycles, and low preconcentration limit
(3.3 ppb) from test solutions of different interferent to analyte
ratio. The chemisorption and identical, independent binding site behavior
were evaluated by Dubinin–Radushkevich isotherm and Scatchard
plot analysis. Equilibrium data fit well to Langmuir adsorption isotherms
(r2 = 0.998) indicating a typical monolayer
sorption. We confirmed the analytical reliability of the method by
the analysis of standard reference materials (SRMs), recovery experiments,
and precision expressed as coefficient of variation (<5%). The
applicability of the proposed method was demonstrated by preconcentration
of trace Al(III) in dialysis fluid, packaged drinking water, rum,
and soft drink samples.
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binding site behaviorbind aluminumdialysis fluidAmberliter 2XADpH 9.Equilibrium dataresinpreconcentrationmethoddrinking watermonolayer sorptionanalyte ratioScatchard plot analysisSEMtest solutionsSRMdrink samplesscanning electron microscopyreference materialsEquilibrium StudiesALangmuir adsorption isothermsEnvironmental SamplesSelective SeparationAl