Adsorption of Brilliant Green Dye Using Raw and Activated Adsorbent Prepared from Sesbania Leaves

Abstract

In present study, the adsorption of brilliant green (BG) dye from an aqueous solution using raw sesbania leaves (RSL) and activated adsorbent of sesbania leaves (ACSL), batch adsorption studies were carried out to evaluate the effects of various parameters such as contact time, initial concentration, adsorbent dosage, pH and temperature on the removal of BG dye from aqueous solution. The maximum percentage removal of BG dye using RSL and ACSL was 73.2 and 93.8, respectively. The best-fitted isotherm for equilibrium data was Freundlich’s and Langmuir’s for ACSL and RSL adsorbents, respectively. The maximum adsorption capacities obtained were 158.74 mg/g and 98.41 mg/g for adsorption of BG dye on ACSL and RSL, respectively. The pseudo-second-order model best fit for the adsorption kinetic studies, which showed that the adsorption of BG dye on both adsorbents (RSL and ACSL) was limited by the chemisorption process. Thermodynamics parameters such as (ΔGº), (ΔHº) and (ΔSº) were also calculated. At 293 K to 333 K, the values of ΔGº lie in the range of 0.9346 to 1.1971 and 6.1199 to 9.0231 for RSL and ACSL, respectively, indicating that the adsorption process is spontaneous and endothermic.