Abstract
En el presente trabajo se utiliza la resina de intercambio aniónico para la eliminación de arsénico(III) de medios acuosos. Esta eliminación se ha investigado teniendo en cuenta diversas variables experimentales como son: la velocidad de agitación del sistema, la temperatura, el pH de la disolución y la dosificación de resina al sistema. El equilibrio de intercambio aniónico tiene un carácter endotérmico y no espontaneo, en el rango de temperaturas comprendido entre 20 °C y 60 °C, la cinética del proceso responde al modelo de pseudo-segundo orden, sin embargo, el mecanismo de carga del arsénico en la resina cambia en el rango de temperaturas comprendido entre 20 °C y 40 °C. La isoterma de carga del metal en la resina responde al modelo linearizado de Freundlich. Se comparan los resultados de carga de arsénico en la resina Dowex 1x8 con los obtenidos con otras resinas y con nanotubos de carbono de pared multiple. La elución del arsénico se puede realizar con disoluciones acidas, por ejemplo 1 M HCl.
Highlights
Though it has several industrial uses and even is necessary for life, arsenic is often related to murder (Emsley, 2005)
Arsenic is present at various oxidation states and in the form of inorganic and organic compounds, the relative toxicity of arsenic compounds depends on: i) inorganic or organic forms ii) oxidation state iii) others
Arsenic compounds are responsible of different diseases including cancer, being estimated that millions of persons are in the potential risk of arsenic ingesta from waters, even Spain is one of the countries in which arsenic toxicity has occurred from natural source contamination of well water (Hughes et al, 2011; ATSDR, 2013; Flora, 2015; Yousefsani et al, 2017)
Summary
Though it has several industrial uses and even is necessary for life, arsenic is often related to murder (Emsley, 2005). Arsenic is present at various oxidation states and in the form of inorganic and organic compounds, the relative toxicity of arsenic compounds depends on: i) inorganic or organic forms ii) oxidation state iii) others. From the various separation methodologies, it appears that ion exchange/adsorption is one of the most widely used procedure for arsenic removal from waters (Ahmad et al, 2017; Inaba et al, 2017; Mal’tseva et al, 2017; Roy et al, 2017; Schouwenaars et al, 2017; Sert et al, 2017; Tavakkoli et al, 2017; Babaee et al, 2018; Kang et al, 2018; Liu et al, 2018; Venkatesan and Narayanan, 2018). Several theoretical models were used to fit the experimental data for a better knowledge of the ion exchange process
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