18Investigation of the Chitosan Immobilized Eggshell for the Biosorption of Brillant Blue R Dye

Abstract

The biosorption method for controlling water pollution can be considered as an alternative method for the pollution of synthetic paints. In this study, the removal of Brillant Blue R (BBR) dyestuff, which is a textile dyestuff, by biosorption is investigated. For this purpose, eggshell immobilized with chitosan (ESIC) is designed as a biosorbent. The biosorption mechanism was studied in batch and continuous mode. As far as the batch system is concerned, the following results have been obtained: The optimum pH 2, dye concentration 25 ppm, interaction time 60 minutes, biosorbent amount 2.0 g/L, removal real wastewater 53.28%. Regarding continuous systems, the following flow speed of 0.5 mL/min, biosorbent amount 2.0 g/L, removal real wastewater 91.01%. Also, recycle experiments showed that there was 24.11% loss in the biosorption capacity of ESIC for BBR dye after 7 times reuse. Obtained results were consistent with Langmuir and Freundlich isotherm models. All the results demonstrate that ESIC is a natural, recyclable and cost-effective biosorbent for BBR dye removal in wastewater.