Adsorption of Acid Yellow 2GL dye from simulated water using brinjal waste

Abstract

This work focuses on the assessment of the potential of leather dye Acid Yellow 2GL in integrated treatment system by ozonation and adsorption using brinjal waste. A perfect experimental design based on central composite design (CCD) with response surface methodology (RSM) was done. The effect parameters, i.e., pH of the solution (5–10), adsorbent dose (3–5 g/L), operation time (5–10 min), and dye concentration (30–80 mg/L), were studied for the removal of Acid Yellow 2GL dye by brinjal waste integrated treatment system. The optimum condition for predicted maximum dye removal was 97% at pH 5.007, operation time 9.99 min, adsorbent dose 3.006 (g/L), and dye concentration 30.06 (mg/L). The study reported that first-order kinetic model, i.e., monolayer adsorption, showed better alignment compared to second-order kinetic model and the mass transfer study revealed that film diffusion is the rate-limiting step for dye removal. Electrostatic attraction, pi–pi interaction, hydrogen bonding, and physical adsorption were the probable mechanism for the adsorption process. The estimated cost (Rs. 230/kg) for the removal of dye by integrated treatment system has also supported the process to be adopted by the leather industry due to cost-efficient process. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.