Repository of Research and Investigative Information

Repository of Research and Investigative Information

Kurdistan University of Medical Sciences

Removal of hexavalent chromium from aqueous solution by adsorption on γ-Alumina nanop articles

(2015) Removal of hexavalent chromium from aqueous solution by adsorption on γ-Alumina nanop articles. Environment Protection Engineering.

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The use of γ-alumina (γ-Al<inf>2</inf>O<inf>3</inf>) nanoparticles as adsorbent to remove Cr(VI) from aqueous solution was investigated using batch experiments. Adsorption experiments were carried out for various initial doses of Al<inf>2</inf>O<inf>3</inf>, initial concentrations of chromium(VI), contact times and pH. The structure and morphology of the sorbent was characterized by XRD, SEM, and TEM techniques. Results demonstrated that the removal efficiency of chromium(VI) was increased by increasing the contact time, initial concentration, and pH. The results of the study showed that adsorption of chromium by γ-alumina nanoparticles reached equilibrium after 60 min and after that a little change of chromium removal efficiency was observed. Furthermore, kinetics of chromium sorption was well fitted by pseudo-second order kinetic model, and well explained by the Freundlich isotherm (R<inf>2</inf>> 0.992). Overall, alumina nanoparticles recognized as an effective sorbent to remove chromium(VI) from aqueous solutions.

Item Type: Article
Keywords: Alumina; Aluminum; Chemicals removal (water treatment); Chromium; Chromium compounds; Nanoparticles; Solutions; Sorption, Adsorption experiment; Alumina Nanoparticle; Freundlich isotherm; Hexavalent chromium; Initial concentration; Pseudo-second-order kinetic models; Removal efficiencies; Structure and morphology, Adsorption
Page Range: pp. 133-145
Journal or Publication Title: Environment Protection Engineering
Volume: 41
Number: 2
Publisher: Technical University of Wroclaw
Identification Number: 10.5277/epel50211
ISSN: 03248828
Depositing User: مهندس جمال محمودپور

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