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Información tecnológica

versión On-line ISSN 0718-0764

Resumen

VAZQUEZ, G.; GONZALEZ-ALVAREZ, J.; FREIRE, S.  y  ANTORRENA, G.. Development of an Adsorbent Based on Tannins from Pinus pinaster Bark. Inf. tecnol. [online]. 2005, vol.16, n.2, pp.47-51. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642005000200008.

Tannin-gel particles, based on tannins extracted from Pinus pinaster bark, have been prepared in a two-stage process. In the first stage (pre-crosslinking), tannins react with formaldehyde. In the second stage (granulation), the partially gelled tannin-formaldehyde solution is dispersed into a mixture of decalin and a non-ionic surfactant. The influence of operation conditions of both stages on the yield and characteristics of the particles has been analysed. The particles, slightly porous and nearly spherical, have been used to adsorb cadmium from aqueous solutions. X-ray energy dispersion spectra obtained after adsorption have confirmed the presence of cadmium on particle surface and, therefore, their capacity for metal cation adsorption.

Palabras clave : Pinus pinaster bark; tannins; gelation; adsorption; metal cations.

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