Textile and dyes industries are generating huge amount of dye wastewater which are toxic and hazardous to the environment. Activated charcoal based adsorption is economical treatment of waste water and water purification. It offers an effective method for removal of organic compounds and colour from wastewater at low cost. The present work is focused on the removal of Reactive Red 195 dye using activated charcoal. The percentage removal of dye is strongly dependent on the input parameters like time of agitation, temperature of system, amount of charcoal added and initial concentration of dye. A statistical technique response surface methodology was employed to study the influence of various input parameters on percentage of dye removal. Three-factor-three-level Box-Behnken Design was used for design of experiments. Freundlich and Langmuir isotherms were fitted well for the described process. Gibbs free energy was also evaluated which was -3.051 KJ/mol at 30°C. This negative value shows the feasibility of the adsorption process. Lagergren first-order rate equation was employed for evaluating kinetics of adsorption. The kad values evaluated, from Lagergren plots was 0.04928 min-1. For 200 mg/L of initial concentration of Reactive Red 195 dye in solution, the optimum process parameters were found to be 1.25 g of activated carbon dosage at 30°C for 75 minute of agitation with optimum percentage removal of dye of ~96%.
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