SciELO - Scientific Electronic Library Online

 
vol.15 issue4Crack propagation under constant amplitude loading based on an energetic parameters and fractographic analysisThe effect of hot multistage drawing on molecular structure and optical properties of polyethylene terephthalate fibers author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Materials Research

Print version ISSN 1516-1439

Abstract

MARTINEZ STAGNARO, Susana Yamila; VOLZONE, Cristina  and  RUEDA, Mónica Luciana. Influence of thermal treatment on bentonite used as adsorbent for Cd, Pb, Zn retention from mono-solute and poly-solute aqueous solutions. Mat. Res. [online]. 2012, vol.15, n.4, pp. 549-553.  Epub July 10, 2012. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392012005000074.

The retentions of Zn, Cd and Pb cations by one treated bentonite up to 750 °C were analyzed. The retentions were evaluated by using mono-and poly-solute aqueous solutions of such cations. The adsorptions were carried out in batch system at room temperature. The solid/liquid ratio was 2% wt.v-1. The solids were characterized by X-ray diffraction, thermal and chemical analyses. The Zn cation from mono- or polysolute-solutions was retained in higher amount than Cd and Pb cations in similar solution types by bentonite. The retentions were effective up to 450 °C calcined bentonite, after that, the retention capacity decreased in concordance with dehydroxylation of the structure of clay minerals.

Keywords : adsorption; thermal treatment; clay; heavy metals.

        · text in English     · pdf in English