Abstract
The powder of green coconut shell (Coco nuscifera L) was chemically
modified and used to remove inorganic anions from aqueous solution
through batch process. The solid was modified with ammonium quaternary
salt (2-hidroxypropyltrimethyl ammonium chloride) and characterized by a
full factorial design. The FTIR, elemental analysis, SEM and X-ray
measurements were performed. FTIR analysis indicated that the coconut
bagasse interacted with NH2 groups of the surfactant. Initial anion
concentration, pH and adsorbent dosage were investigated in this study,
as well as the kinetics of adsorption and isotherms for the modified
coconut bagasse. Kinetics of adsorption was examined by means of three
kinetic models, i.e., pseudo-first-order, pseudo-second-order and
intraparticle diffusion models. Pseudo-second-order kinetic model showed
good agreement with the experimental data. Data on equilibrium were
evaluated by using Langmuir, Freundlich, SIPS, Redlich-Peterson, Temkin
models. It was observed that the experimental data fits well to
Langmuir, SIPS, and Redlich-Peterson equations. The results indicated
that the modified coconut powder exhibited potential application for
removal of nitrate, sulfate and phosphate from aqueous solutions. (c)
2012 Elsevier B.V. All rights reserved.
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