Title
Valorisation of rapeseed as biosorbent for the removal of textile dyes from aqueous effluents
Authors
IRINA MOROSANU ANDREEA-FLORINA GILCA CARMEN PADURARU DANIELA FIGHIR (ARSENE) CATALINA ANISOARA PEPTU and CARMEN TEODOSIU

Received January 13, 2016
Published Volume 51 Issue 1-2 January-February
Keywords sorption, Reactive Blue 19, rapeseed, isotherms, wastewater

Abstract
Lignocellulosic materials have been recognized as efficient, renewable and low-cost sorbents for the removal of dyes from effluents generated during textile processing. The objective of this work was to assess the suitability and efficiency of rapeseed biomass for the retention of Reactive Blue 19 dye from aqueous effluents. The effect of several variables on the sorption process in batch mode as a function of solution pH, initial dye concentration, contact time and temperature has been studied at laboratory scale. Removal efficiencies of over 49.63% were recorded for all experiments in the batch mode of operation. The experimental results show that the amount of dye retained onto rapeseed is proportional with the concentration and it has a faster rate of dye removal in the first 60 minutes. The kinetics of dye sorption has the highest correlation with the pseudo-second order model. Three widely used isotherm models (Langmuir, Freundlich and Dubinin-Raduskevich) were used to fit the experimental data. Thermodynamics analysis indicated the spontaneous and endothermic nature of the process.