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Equilibrium and Kinetic Studies of an Eco-Friendly Biosorbent for Removal of Procion Blue Dye from Aqueous Solutions: Water Lettuce (Pistia stratiotes) Dead Biomass

S. Jemimah1,2,* and S.R. Bheeter2

1Department of Chemistry, St. Joseph's College (Autonomous), Tiruchirappalli-620 002, India

2Department of Chemistry, St. Joseph's Institute of Technology, Chennai-600 119, India

*Corresponding author: Fax: +91 44 24503133; Tel: +91 44 24503132; E-mail: jemimahraj@gmail.com

Abstract

Procion blue dye has been removed from aqueous solution by dried biomass of water lettuce. The effect of experimental conditions such as pH, biosorbent dosage, initial dye concentration of procion blue, adsorption isotherm and adsorption kinetics of water lettuce were investigated. The morphology and elemental composition of water lettuce were analyzed by scanning electron microscope and energy dispersive spectroscope (SEM-EDS) respectively. Two kinetic models pseudo-first- and second-order equations were chosen to follow the adsorption process and the adsorption of procion blue followed pseudo-second-order kinetics. The experimental isotherm data were analyzed using Langmuir and Freundlich equations and found that the experimental data followed Langmuir isotherm suggesting homogenous, monolayer adsorption of the dye on the biomass surface. The results of the present study reveal that the dried water lettuce biomass is a promising low-cost sorbent for the removal of procion blue.

Keywords

Procion blue, Reactive blue 13, Adsorption, Pistia stratiotes, Water lettuce.

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