Spectroscopically study of competitive adsorption of planer and non-planer reactive dyes over magnesium oxide nanoparticles sustainably fabricated through autoignition

The competitive adsorption of reactive dyes occurs in the treatment of effluents discharged from textile factories. In the current study, the competitive adsorption of industrial reactive dyes, including R Blue 222, R Red 195, and R Yellow 160 from the multi-component wastewaters was UV-visible spectroscopically investigated onto the porous magnesium oxide fabricated by autoignition from foundry dust. The immobilization of dye anions by MgO nanoparticles mainly involved with crystallite size, pore size distribution, and the proportion of pollutants. The maximal efficiency was identified for the adsorbent with the smaller crystallite size, 34 nm, produced through the application of combined fuel, mainly containing glycine, 66.6 %. Although the content of dyes adsorbed over nanoparticles from single-component systems follows the order of R Yellow 160 > R Red 195 > R Blue 222, the competitive adsorption declines the capacity of adsorbent especially for the uptake of R Blue 222, and R Yellow 160. This phenomenon not only is interpreted with the number of N-H, and SO3- groups in the contaminant structure, but also the planarity of dye molecule plays effective role in the treatment process. The McKay, and Al Duri isotherm, which involves with a lumped capacity factor, was used to mathematically describe the competitive adsorption demonstrated the decline in adsorption capacity. It is found that R Red 222 prevents the penetration of R Blue 222, and R Yellow 160 when wastewater consists of red dye predominately, 66.6 %. The fabricated porous adsorbent based on the facile, economic, and eco-friendly technique showed an efficient potential in the decontamination of industrial textile wastewaters.