La eliminación de metales tóxicos presentes en efluentes líquidos mediante resinas de cambio iónico. Parte XVII: Arsénico(V)/H+/Dowex 1x8
DOI:
https://doi.org/10.3989/revmetalm.221Palabras clave:
Arsenico(V), Dowex 1x8, Efluentes líquidos, Eliminación, Nanotubos de carbono de pared múltipleResumen
Se ha investigado la eliminación de arsénico(V) de disoluciones acuosas mediate la resina de intercambio aniónico Dowex 1x8. Los experimentos se han llevado a cabo bajo diferentes condiciones experimentales como, velocidad de agotación, pH de la disolución acuosa, concentración de la resina y temperatura. Debido a la especiación del arsénico(V) en medio acuoso, la eliminación de este no es posible en medios de bajo o alto valor del pH, pero es posible a valores de pH comprendidos entre 4 y 9, por lo tanto, las especies HAsO42- y H2AsO4- son las responsables de la carga del elemento en la resina. En este margen, 4-9, de valores de pH, la eliminación del arsénico del medio acuoso tiene carácter exotérmico. Los datos experimentales se han adaptado a distintos modelos en relación con el mecanismo de la eliminación del arsénico de la disolución, cinética, y carga del elemento en la resina; asimismo, se ha comparado la carga del arsénico en la resina con la que se obtiene con el empleo de nanotubos de carbono de pared múltiple. La etapa de elución se ha investigado empleando disoluciones de ácido clorhídrico, de estos eluidos, el arsénico(V) se puede estabilizar precipitándolo como los arseniatos de hierro(III) o calcio.
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