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Equilibrium studies for the sorption of chromium and nickel from aqueous solutions using raw rice bran

Paper ID Volume ID Publish Year Pages File Format Full-Text
36505 45134 2005 6 PDF Available
Title
Equilibrium studies for the sorption of chromium and nickel from aqueous solutions using raw rice bran
Abstract

The capacity of raw rice bran for chromium and nickel removal from aqueous solutions was investigated. The Langmuir and Freundlich adsorption models, which are in common use for describing sorption equilibrium for wastewater-treatment applications, were used to represent the experimental data and equilibrium data fitted well to the Freundlich isotherm model. The negative value of ΔG° for Cr(III) indicates the spontaneous nature of sorption, but positive values were determined for Cr(VI) and Ni(II). Indeed, Cr(VI) and Ni(II) are sorbed due to the strong interactions with the active sites of the sorbent. The kinetics data for chromium and nickel sorption onto rice bran were studied according mass transfer and intraparticle diffusion models in order to increase sorption process understanding. A very good correlation coefficient was obtained using the pseudo-second-order kinetic model, suggesting that chromium and nickel sorption process onto rice bran particles tend to follow second-order kinetics.

Keywords
Rice bran; Biosorption; Heavy-metal ions; Kinetics; Freundlich model
First Page Preview
Equilibrium studies for the sorption of chromium and nickel from aqueous solutions using raw rice bran
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 40, Issue 11, November 2005, Pages 3485–3490
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering