ZnOS+C adsorbent for the effective removal of Fast Green dye from synthetic and real wastewater

Abstract

Wastewater treatment is becoming increasingly important due to the potential shortage of pure drinking water in many parts of the world. Adsorption offers a potential technique for the uptake of contaminants and wastewater purification. In the last two decades, several efforts have been made to remove fast green (FG) dye from wastewater via different adsorbent materials. But adsorption capacity shown by these adsorbents is low and is time-consuming. Herein, we have synthesized for the first time a new powdered adsorbent ZnOS+C, modified Zinc peroxide with sulfur and activated carbon to effectively remove FG dye from wastewater. Results of batch adsorption experiments have suggested that ZnOS+C has the maximum adsorption capacity of 238.28 mg/g for FG dye within 120 minutes of adsorption equilibrium for a wide range of pH ranging from 2-10 pH. The adsorption process follows the Freundlich isotherm model, suggesting a multilayered adsorption process that occurs on the surface of ZnOS+C. The adsorption kinetics study indicates that the kinetics of the reaction is the intraparticle diffusion model. Briefly, this study shows the proof of application of ZnOS+C powder as a new eco-friendly adsorbent with extremely high efficiency and high surface area for removing FG dye.