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 μg 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.
Adsorption of arsenic in dacitic tuff pretreated with magnesium oxide
Liliana Rodríguez-Flores, Yolanda Marmolejo-Santillán, Fidel Pérez-Moreno, Araceli Castañeda-Ovando, Araceli Sierra-Zenteno, Kinardo Flores-Castro, José Luis Cadena-Zamudio; Adsorption of arsenic in dacitic tuff pretreated with magnesium oxide. Water Supply 1 February 2015; 15 (1): 181–187. doi: https://doi.org/10.2166/ws.2014.103
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