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Kinetic and equilibrium studies on adsorption of Reactive Blue 19 dye from aqueous solutions by nanohydroxyapatite adsorbent

By Ciobanu Gabriela, Barna Simona and Harja Maria

Abstract

In the present study the adsorption of Reactive Blue 19 dye on the hydroxyapatite (HAp) nanopowders was investigated. The batch adsorption experiments were performed by monitoring the adsorbent dosage, contact time, dye solution concentration, pH and temperature. At pH 3 and 20°C, high dye removal rates of about 95.58% and 86.95% for the uncalcined and calcined nanohydroxyapatites, respectively, were obtained. The kinetic studies indicated the dye adsorption onto nanohydroxyapatite samples to follow a pseudo-second order model. The Langmuir isotherm was found to be the best to represent the equilibrium with experimental data. The maximum adsorption capacity of uncalcined and calcined nanohydroxyapatite samples has been found to be 90.09 mg/g and 74.97 mg/g, respectively

Topics: Reactive Blue 19 dye, hydroxyapatite, adsorption, Environmental protection, TD169-171.8
Publisher: De Gruyter Open
Year: 2016
DOI identifier: 10.1515/aep-2016-0014
OAI identifier: oai:doaj.org/article:cfa2e0da73c84a74967d8b9f01bd92c6
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