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Adsorption of malachite green onto Pithophora sp., a fresh water algae: Equilibrium and kinetic modelling

Paper ID Volume ID Publish Year Pages File Format Full-Text
36480 45133 2005 8 PDF Available
Title
Adsorption of malachite green onto Pithophora sp., a fresh water algae: Equilibrium and kinetic modelling
Abstract

Batch biosorption experiments were carried out for the removal of malachite green a cationic dye from its aqueous solution using raw and thermally activated Pithophora sp., a fresh water algae as biosorbent. The operating variables studied are initial malachite green concentration, biomass concentration and solution pH. Pithophora sp. activated at 300 °C for 50 min posses a maximum sorption capacity for the range of initial dye concentrations studied (20–100 mg/L). The sorption kinetics were analysed using reversible first order kinetics, pseudo-first order, pseudo-second order model and the sorption data tend to fit very well in pseudo-second order model for the entire sorption time. The average pseudo-second order rate constant, KII and initial sorption rate h were determined to be 3.46 × 10−3 and 7.97 × 102 mg/g h. Equilibrium data are very well represented by Redlich Peterson isotherm model followed by Freundlich and Langmuir isotherm model. The maximum sorption capacity was 117.647 mg/g at 30 °C. The negative value of free energy change (−8.585 kJ/mol) indicates the spontaneous nature of adsorption.

Keywords
Biosorption; Pithophora sp.; Fresh water algae; Malachite green; Kinetics; Equilibrium
First Page Preview
Adsorption of malachite green onto Pithophora sp., a fresh water algae: Equilibrium and kinetic modelling
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 40, Issue 8, July 2005, Pages 2865–2872
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering