Remoción de iones cromo y cobre desde soluciones acuosas con cenizas volantes de carbón mineral

Abstract

This study analyzes the use of fly ash, from an electrical power plant, to be used as adsorbent material in an aqueous solutions o chromium and copper ions, to use in treatment of waste water from mining operations. The fly ash analyses of FRX and DRX, mainly showed Si, Al, Fe and O. The above components are primarily responsible for the surface patterns, with a pH of 10.66 for the full sample and 3.7 point of zero charge. Therefore, adsorption of Cr (VI) as HCrO4-(anionic) is favored at pH2 with a removal of 67.98%. This removal increases as the concentration of the metal is reduced, reaching a 79.30% at 10 [mg /L] chromium. In the case of copper (cationic character), an adsorption of 100% is obtained at pH 4, independent of the contact time, 1 hour of exposure peaks removal. It is concluded that the fly ash of coal, currently, considered a waste material. It can be used as unconventional adsorbent material of metal ions under acid pH 4, attributed mainly to the presence of SiO2, Al2O3 and Fe2O3.