Nanoparticles of KFeP sub(2)O sub(7) implanted on silica gel beads for Cd super(2+) ion adsorption

Nanoparticles of iron and potassium diphosphate (KFeP sub(2)O sub(7)) implanted in silica gel beads (SiO sub(2)) have been investigated as an alternative adsorbent for removing Cd super(2+) ions from aqueous solutions. Batch adsorption experiments were conducted as a function of contact time, adsorb...

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Bibliographic Details
Published in:Environmental technology 2015-01, Vol.36 (2), p.188-197
Main Authors: Ordonez-Regil, Eduardo, Granados-Correa, Francisco, Ordonez-Regil, Enrique, Almazan-Torres, Maria Guadalupe
Format: Article
Language:English
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Summary:Nanoparticles of iron and potassium diphosphate (KFeP sub(2)O sub(7)) implanted in silica gel beads (SiO sub(2)) have been investigated as an alternative adsorbent for removing Cd super(2+) ions from aqueous solutions. Batch adsorption experiments were conducted as a function of contact time, adsorbent dosage, initial cadmium ion concentration, solution pH, and temperature. Kinetic and thermodynamic studies on the cadmium adsorption onto KFeP sub(2)O sub(7)/SiO sub(2) include a complete analysis and discussion. The equilibrium data were well described by the Freundlich isotherm model. The adsorption kinetic of cadmium on KFeP sub(2)O sub(7)/SiO sub(2) followed a pseudo-first-order kinetic model obtained by using nonlinear regression analysis. Thermodynamic parameters (enthalpy change, free energy change, and entropy change) indicated that the Cd super(2+) adsorption process was spontaneous and exothermic in nature. The results showed that the studied KFeP sub(2)O sub(7) nanomaterial implanted in silica is an effective adsorbent for cadmium ion removal from wastewater.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2014.941942