Response surface modeling of methylene blue dye removal from wastewater on natural oil shale
Maryem Rahmani, Boutaina Regraguy, Jamal Mabrouki, Ahmed Moufti, Mohamadine El’Mrabet, Abdelmalek Dahchour, Souad El Hajjaji
Abstract
ABSTRACT In this work, the natural oil shale (NOS) performance was explored for removing methylene blue as textile pollutant. The adsorbent was characterized using X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscope (SEM). Further, the response surface methodology (RSM) was investigated to optimize the factors influencing the adsorption of MB onto NOS, using central composite design (CCD). The effect of the experimental parameters on adsorption yield, initial concentration of MB, mass of adsorbent, granulometry and pH, was studied using the response surface methodology (RSM). The obtained results show that the high MB adsorption rate (R% = 98%) is in a basic pH (pH = 12). The analyzes performed, based on residue and analysis of variance (ANOVA), confirmed that NOS had a high efficiency adsorbent capacity and that the chosen model is valid.