Abstract
Sunset yellow (SY) FCF is a hazardous azo dye pollutant found in food processing effluents. This study investigates the use of inactivated aerobic granular sludge (AGS) as a potential adsorbent for the removal of SY from water. Adsorption studies were carried out at varying pH values, dosages of adsorbent, initial dye concentrations, and temperatures. Optimal adsorption conditions were identified at pH 2.0, adsorbent dosage of 2.0g L−1, contact time under 120 min, and 35°C temperature. Equilibrium data of the adsorption process fitted very well to the Freundlich model (R2 > 0.99). Kinetics results showed that the experimental data fitted well to the pseudo-second-order model (R2 > 0.99). The thermodynamic parameters such as enthalpy change (ΔH°), entropy change (ΔS°), and Gibbs free energy (ΔG°) were calculated. Thermodynamic testing demonstrated that the adsorption of SY was a spontaneous and endothermic process. Fourier transform infrared spectroscopy indicated that functional groups played an important role during the adsorption of SY. These results confirm that AGS can be used as an adsorbent for successful removal of SY dye from wastewater.
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