Dynamic and static adsorption and desorption of Hg(II) ions on chitosan membranes and spheres

The adsorption and desorption of Hg(II) ions was studied using static and dynamic methods, employing membranes and spheres of chitosan as the adsorbent. The quantity of adsorption was influenced by chitosan crosslinking and by the adsorbent shape. The Langmuir model was applied to fit the experiment...

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Bibliographic Details
Published in:Water research (Oxford) 2006-05, Vol.40 (8), p.1726-1734
Main Authors: Vieira, Rodrigo S., Beppu, Marisa M.
Format: Article
Language:English
Subjects:
adsorbents
Adsorption
Applied sciences
artificial membranes
Chitosan
Chitosan - chemistry
crosslinking
desorption
Exact sciences and technology
glutaraldehyde
Heavy metal
heavy metals
ions
Membranes, Artificial
Mercury
Mercury - chemistry
Microscopy, Electron, Scanning
Other industrial wastes. Sewage sludge
Pollution
shape
Wastes
water pollution
water treatment
Water treatment and pollution
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Summary:The adsorption and desorption of Hg(II) ions was studied using static and dynamic methods, employing membranes and spheres of chitosan as the adsorbent. The quantity of adsorption was influenced by chitosan crosslinking and by the adsorbent shape. The Langmuir model was applied to fit the experimental equilibrium data. Glutaraldehyde-crosslinked membranes presented a lower desorption capacity, when compared to natural membranes, but could be regenerated for use in successive cycles. Dynamic adsorption experiments suggested that the adsorption capacity depended mainly on adsorbent geometry, due to differences between surface area to mass ratio and initial concentration of Hg(II) ions. The adsorption capacity determined by the dynamic method was 65% and 77% for membranes and spheres, respectively of the value obtained static method results. A process combining dynamic adsorption and static desorption can be used to concentrate the Hg(II) ions by a factor of nearly seven (7×), when compared to the initially treated volume.
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2006.02.027