The removal of toxic metals from liquid effluents by ion exchange resins. Part XII: Mercury(II) /H+/Lewatit SP112
Mercury(II) was eliminated, from acidic aqueous solutions, by the cationic ion exchange resin Lewatit SP112. Various experimental conditions were tested in the investigation, such as, stirring speed (275-1000 min), temperature (20-60 °C), pH of the aqueous solution (0-4) and resin dosage (0.05-0.4 g...
| Autores: | , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/221185 |
| Acesso em linha: | http://hdl.handle.net/10261/221185 |
| Access Level: | acceso abierto |
| Palavra-chave: | Lewatit SP112 Liquid effluents Mercury(II) Multiwalled carbon nanotubes Removal |
| Resumo: | Mercury(II) was eliminated, from acidic aqueous solutions, by the cationic ion exchange resin Lewatit SP112. Various experimental conditions were tested in the investigation, such as, stirring speed (275-1000 min), temperature (20-60 °C), pH of the aqueous solution (0-4) and resin dosage (0.05-0.4 g·L). Mercury(II) uptake onto the resin decreased with the increase of the temperature (exothermic reaction) in a spontaneous process, whereas the moving boundary model represented the metal uptake in the 20-60 °C temperatures range. Moreover, the experimental data fitted to the second order kinetic model (275 min) or the pseudo-second order kinetic model (500-1000 min), though maximum metal uptake was not dependent on the stirring speed applied to the system. The experimental results responded well to the Langmuir type-2 isotherm. The Hg(II)-loading ability of Lewatit SP112 was compared against that of other resins and non-functionalized multiwalled carbon nanotubes. Mercury(II) loaded onto the resin can be eluted by means of various eluants, furher, zero valent mercury was yielded from the eluates. |
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