Removal of Reactive Yellow 160 from Industrial Wastewater onto Modified Sand (Sand of Larache city beach. Morocco)

Abstract

The aim of this research paper is to investigate the removal of Reactive Yellow 160 (RY160) from industrial wastewater onto Modified Sand (MS). The adsorbent was characterized by infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDXA). The effects of significant parameters such as adsorbent dose, pH, initial dye concentration, contact time, temperature were examined. It was revealed that the removal rate percentage was equal to 92.6%, the maximum adsorption capacity appeared at pH 1, and the optimal contact time for the removal of RY160 onto MS was 120min. Adsorption kinetics, isotherms and thermodynamic parameters were studied. The finding shows that the Langmuir isotherm and the Pseudo-second order kinetic model described well the adsorption process. The thermodynamic study disclosed that the adsorption of RY160 onto MS is exothermic and spontaneous with a physisorption nature.

Keywords: Modified Sand, Reactive Yellow 160 (RY160), Adsorption, wastewater treatment, Industrial dyes.