Removal of brilliant green dye from wastewater using activated chickpea husk as an adsorbent

Abstract

A novel adsorbent was developed from chickpea husk and its powder form was used for elimination of brilliant green dye from wastewater. Activated carbon from chickpea husk has been prepared and distinguished with a Scanning electron microscope, Brunauer-Emmett-Teller surface area analyser and a Fourier transform infrared spectroscope. Different variables, like contact time of adsorbent and adsorbate, adsorbent amount, initial concentration of dye and pH were studied to perceive their effect on adsorption of dye. The elimination percentage of brilliant green dye by using chickpea husk was found to be 90.3 % in 150 min at a concentration of 20 mg/l and pH = 7 when a dose of 0.1 g was used. Adsorption kinetics was verified by pseudo 1st order and pseudo 2nd order. It was observed that rate of adsorption of brilliant green dye follows pseudo 2nd order model. Experimental equilibrium study was discussed using Langmuir and Freundlich isotherms models and it was observed that the Freundlich adsorption isotherm model was well fitted for the adsorption of brilliant green dye.