2.Liliana Rodríguez-Flores, Yolanda Marmolejo-Santillán, Fidel Pérez-Moreno, Araceli Castañeda-Ovando, Araceli Sierra-Zenteno, Kinardo Flores-Castro and José Luis Cadena-Zamudio. Adsorption of arsenic in dacitic tuff pretreated with magnesium oxide. Water Science & Technology: Water Supply. Ed. IWA Publishing. 2015, 15(1): 181-187. ISSN Print: 1606-9749. FI. (2013): 0.505
This study characterized a natural adsorbent material, a dacitic tuff, from Aguas Blancas in Zimapan Hgo. by emission spectroscopy of inductive coupling plasma, X-ray diffraction and scanning electronic microscopy. Also, the influences of concentration, contact time, and pH on the adsorption capacity of arsenic (As) on a dacitic tuff doped with MgO by batch technique were assessed. The results show that the treated material can increase adsorption capacity by 95% compared to natural, untreated material. The pH range for better As adsorption is 3?7 at ambient temperature. The data were evaluated using Langmuir and Freundlich models; these were better suited to the Langmuir model with a capacity of adsorption of 1,897.1 ?g g?1. Finally, the mechanism proposed between adsorbent and As compounds is an anion exchange, according to the Kaganer?Dubinin?Radushkevich model, which is provided by functional groups MgOH2+ that were fixed on the material.