摘要：The present study deals with the adsorptive removal of Reactive Blue 19 (RB19) and Direct Red 81(DR81)from their aqueous solutions. Powdered Activated Carbon (PAC) was used as an adsorbent. Batch studieswere performed to analyse various experimental parameters like adsorbent dose, pH, contact time and initialdye concentration. Optimum PAC doses for RB19 and DR81 were found to be 0.2 g/L and 0.3 g/L, respectively.Effective pH for RB19 and DR81 removal was found to be 2 and 7, respectively. In addition, high percentremoval with decrease in initial dye concentration was observed. Quasi-equilibrium was attained in 3h forboth dyes. Pseudo-second-order rate equation satisfactorily represented the adsorption kinetics for both thedyes. Langmuir and Temkin isotherms were found to best represent the equilibrium data for DR 81-PACsystem whereas for RB19-PAC system Langmuir isotherm was found to be best suited. Furthermore,thermodynamic studies showed that the adsorption of both the dyes onto PAC was exothermic in nature.
