The removal of toxic metals from liquid effluents by ion exchange resins. Part XIII: Zinc(II)/H+/Lewatit OC-1026
Zinc(II) was removed, from aqueous solutions, by the ion exchange resin Lewatit OC-1026 (having di-2-ethylhexyl phosphoric acid as adsorbed functional group). Different experimental variables influencing metal uptake, such as, stirring speed (400–1200 min−1), temperature (20–60 °C), pH of the aqueou...
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/221340 |
| Acceso en línea: | http://hdl.handle.net/10261/221340 |
| Access Level: | acceso abierto |
| Palabra clave: | Lewatit OC-1026 Liquid effluents Multiwalled carbon nanotubes Removal Zinc(II) |
| Sumario: | Zinc(II) was removed, from aqueous solutions, by the ion exchange resin Lewatit OC-1026 (having di-2-ethylhexyl phosphoric acid as adsorbed functional group). Different experimental variables influencing metal uptake, such as, stirring speed (400–1200 min−1), temperature (20–60 °C), pH of the aqueous solution (1–4) and resin dosage (0.05–1 g·L−1) were investigated. The concentration of zinc(II) loaded onto the resin decreased with the increase of the temperature (exothermic reaction) in a spontaneous process, whereas equi-librium was achieved at shorter times as the temperature was increased. The experimental values fitted to the second order kinetic model (60 °C) or the pseudo-second order kinetic model (20 °C).The ion exchange process was pH-dependent, decreasing the percentage of zinc(II) loading onto the resin from pH 4 to pH 1. At pH 4, the rate law was best fitted to the particle diffusion model, and to the Langmuir type-2 isotherm. Zinc(II) removal from the aqueous solution using this resin is by far better than when oxidized or non-oxidized multiwalled carbon nanotubes were used as adsorbents for zinc(II). This element can be eluted from zinc-loaded resin using acidic solutions. |
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