Journal of Environmental Biology

Adsorption capacity of Curcuma longa for the removal of basic green1 dye – equilibrium, kinetics and thermodynamic study

 

K.V. Roopavathi and S. Shanthakumar*

Environmental Engineering Lab, School of Civil and Chemical Engineering, VIT University, Vellore-632 014, India

*Corresponding Author E-mail: shanthakumar.s@vit.ac.in

 

 

Publication Data

Paper received:

15 April 2015

 

Revised received:

13 October 2015

 

Re-revised received:

03 December 2015

 

Accepted:

15 January 2016

 

Abstract

In the present study, Curcuma longa (turmeric plant) was used as an adsorbent to remove Basic Green 1 (BG) dye. Batch study was carried out to evaluate the adsorption potential of C. longa and influencing factors such as pH (4-10), adsorbent dose (0.2-5 g l^-1), initial dye concentration (50-250 mg l^-1) and temperature (30-50°C) on dye removal were analysed. The characterisation of adsorbent was carried out using fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and Brunauer, Emmett and Teller (BET) method. Isotherm models that included Langmuir, Freundlich, Tempkin and Dubinin–Radushkevich, and kinetic models such as pseudo first order, pseudo second-order, Elovich and intraparticle diffusion models were studied. A maximum removal percentage (82.76%) of BG dye from aqueous solution was obtained with optimum conditions of pH 7, 1g l^-1 adsorbent dose and 30°C temperature, for 100 mg l^-1 initial dye concentration. The equilibrium and kinetic study revealed that the experimental data fitted suitably the Freundlich isotherm and Pseudo second order kinetic model. Thermodynamic analysis proved that adsorption system in this study was spontaneous, feasible and endothermic in nature.

 

Key words

Adsorption, Basic Green1 dye, Turmeric plant 

 

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