The removal of toxic metals from liquid effluents by ion exchange resins. Part VIII: Arsenic(III)/OH-/Dowex 1x8
The removal of the toxic arsenic(III) from aqueous solutions is investigated using the ion exchange technology and the Dowex 1x8 resin. Different experimental variables which may influence the uptake equilib-rium are considered: Stirring speed of the system, temperature, NaOH concentration in the so...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2018 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/188621 |
| Acceso en línea: | http://hdl.handle.net/10261/188621 |
| Access Level: | acceso abierto |
| Palabra clave: | Dowex 1x8 Removal Multiwalled carbon nanotubes Liquid effluents Arsenic(III) |
| Sumario: | The removal of the toxic arsenic(III) from aqueous solutions is investigated using the ion exchange technology and the Dowex 1x8 resin. Different experimental variables which may influence the uptake equilib-rium are considered: Stirring speed of the system, temperature, NaOH concentration in the solution, and resin dosage. The anion exchange equilibrium is endothermic and non-spontaneous, in the 20 °C - 60 °C range of temperatures the metal uptake onto the resin responded to the pseudo-second order kinetic model, however, the loading mechanism is temperature dependent in the 20 °C - 40 °C range. The linear fit of the experimental data showed that the loading isotherm is best explained by the Freundlich model. The results of arsenic(III) uptake in the present system are compared against the metal uptake which one can obtain with other resins and multi-walled carbon nanotubes. Arsenic(III) loaded onto the resin is eluted by the use of 1M HCl solution. |
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