Heavy metal sequestration properties of a new amine-type chelating adsorbent

Citation
Rr. Navarro et al., Heavy metal sequestration properties of a new amine-type chelating adsorbent, WATER SCI T, 38(4-5), 1998, pp. 195-201
Citations number
9
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
WATER SCIENCE AND TECHNOLOGY
ISSN journal
0273-1223 → ACNP
Volume
38
Issue
4-5
Year of publication
1998
Pages
195 - 201
Database
ISI
SICI code
0273-1223(1998)38:4-5<195:HMSPOA>2.0.ZU;2-5
Abstract
The performance of poly(CGMAPEI), an amine-type chelating adsorbent synthes ized by graft polymerization, was evaluated in a simulated waste stream con taining Cu2+ and Co2+ heavy metal ions and NaNO3 salt. Comparisons of metal adsorption curves of this adsorbent with a previously synthesized cellulos e-PEI and commercially available chitosan-polyamine and amberlite resins we re made. The poly(CGMAPEI) exhibited the highest capacity in the absence of NaNO3. At high concentrations of NaNO3, the affinities of all the amine-ty pe adsorbents were found to be enhanced quite tremendously. The chelating a dsorbent with the highest amine content (CS-03) showed the highest improvem ent in capacity. This phenomenon was not observed with the ion-exchanger (a mberlite IRC 50) studied. Sodium ions showed negligible affinity for poly(C GMAPEI). Competition between Na+ with Cu2+ for adsorption sites in the adso rbent was absent. Regeneration experiments revealed some reduction in Cu2affinity of poly(CGMAPEI) after acid treatment. Difficulty in stripping Co2 + from poly(CGMAPEI) even by strong acid was also observed. (C) 1998 Publis hed by Elsevier Science Ltd. All rights reserved.