Biodecolorization of Remazol dyes using biochar derived from Ulva reticulata: isotherm, kinetics, desorption, and thermodynamic studies
A.K. Priya, R. Gokulan, Arun Vijayakumar, S. Praveen
Abstract
ABSTRACT In this work, the preliminary batch trials were performed to optimize the factors influencing the Remazol dyes remediation using Ulva reticulate biochar. U. reticulate a green marine seaweed is used as a low-cost adsorbent to remediate the Remazol dyes in aqueous solution. The optimum values were achieved at 2 g/L biochar dosage, 2.0 equilibrium pH, 0.05 mmol/L initial dye concentration, and 30°C temperature with a maximum removal efficiency of around 92%. Thermodynamic studies proved that the reactions are spontaneous and endothermic. Toth a three-parameter isotherm model performed well in comparison with other models demonstrating a regression coefficient of 0.9999. The kinetic study results indicate that the pseudo-second-order kinetic is the best fit model. Finally, the regeneration study concluded that of different elutant, NaOH showed the maximum desorption efficiency of greater than 99.2% for all four Remazol dyes.