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Cuban zeolite for lead sorption: application for water decontamination and metal quantification in water using nondestructive techniques
Enamorado-Horrutiner, Y.; Villanueva-Tagle, M. E.; Behar, M.; Rodríguez-Fuentes, G.; Ferraz Dias, J. & Pomares-Alfonso, M. S.
Abstract
In the present paper, a Cuban clinoptilolite-type
zeolite was used as lead sorbent. The effect of chemical
conditioning with 1 mol L-1 NaCl, NaOH and NH3 solutions
at room temperature on the ion exchange capacity for
lead uptake by clinoptilolite has been investigated.
According to the batch experiments, NH3-treated clinoptilolite
exhibited the highest sorption capacity. For this
material, the effect that contact time, solid-to-liquid ratio
and pH have on the removal of lead from aqueous solutions
was comprehensively analyzed, and the most suitable values
for these parameters were selected afterward. The
pseudo-second-order kinetic model was appropriate for the
description of the kinetic performance of the sorption. The
Langmuir and Freundlich isotherm models were applied to
describe sorption process, and the best fit was reached by
using the Freundlich model. The nondestructive techniques,
namely particle-induced X-ray emission and X-ray
fluorescence, have successfully been evaluated for determining
lead concentration in water by its concentration in
zeolite. In addition, the more traditional flame atomic
absorption spectrometry determination of lead in water was
also improved.
Keywords
Lead determination; Kinetic modeling; Sorbent material; Particle-induced X-ray emission; X-ray fluorescence
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