Indian Journal of Advances in Chemical Science, Volume: 9, Issue :2, April 2021

ISSN No.: 2320-0898 (Print); 2320-0928 (Electronic)

DOI: 10.22607/IJACS.2021.902004

Research Article

Adsorption of Remazol Black 5 and Indigo Carmine on Corn Cobs Activated Carbon: Kinetic, Equilibrium, and Thermodynamic Studies

ABSTRACT

In the present work, the study of the adsorption of Indigo Carmine (IC) and Remazol black 5 (RB5) dyes on activated carbon produced from corn cobs (corn cob activated carbon [CCAC]) was performed. The adsorption kinetics of each dye followed a pseudo-second-order kinetic model with high correlation coefficients (R2 > 0.99) with 30 min as equilibrium time. Parameters such as the initial dye concentration, the initial pH of the solution and the temperature were well investigated. The amount of dyes adsorbed increases with the initial concentration and decreases with the increase of pH. The optimal pH is therefore 2. For an initial concentration of 25 mg/L, the rate of elimination at pH = 2 is 99.96% and 96.92%, respectively, for IC and RB5 at 25°C. The adsorption of these dyes also increases with temperature. With an initial concentration of 100 mg/L, the percentage dye uptake increased from 62.14% at 25°C to 99.99 % at 70°C for IC and from 47.12% at 25°C to 99.93 % at 70°C for RB5. These adsorption processes are spontaneous and endothermic. The Freundlich and Langmuir models well describe the phenomenon of adsorption which is physisorption in nature. When IC and RB5 are mixed, the adsorption capacity of CCAC decreases.

Key words: Corn cobs activated carbon, Adsorption, Thermodynamics, Kinetics, Indigo carmine, Remazol black 5

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