A comparison of organic wastes as bioadsorbents of heavy metal cations in aqueous solution and their capacity for desorption and regeneration

Zhou, Ya-Feng and Haynes, Richard J. (2012) A comparison of organic wastes as bioadsorbents of heavy metal cations in aqueous solution and their capacity for desorption and regeneration. Environmental Earth Sciences, 66 4: 1137-1148.

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Author Zhou, Ya-Feng
Haynes, Richard J.
Title A comparison of organic wastes as bioadsorbents of heavy metal cations in aqueous solution and their capacity for desorption and regeneration
Journal name Environmental Earth Sciences   Check publisher's open access policy
Publication date 2012-06
Sub-type Article
Year available 2011
DOI 10.1007/s12665-011-1321-4
Volume number 66
Issue number 4
ISSN 1866-6280
1866-6299
Start page 1137
End page 1148
Total pages 12
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2013
Language eng
Formatted abstract The adsorption capacity of seven organic wastes/by-products (slash pine, red gum and western cypress bark, composted green waste, prawn exoskeletons, spent brewery yeast and mill mud from a sugar mill) for transition metals were determined at two metal concentrations (10 and 100 mg L -1) and three equilibrium pH values (4.0, 6.0 and 8.0) in batch adsorption experiments. All tested materials indicate a positive affinity to adsorb metal cations from aqueous solution and spent yeast was the least effective. Adsorption generally increased with increasing pH and the order of selectivity of metals was: Cr 3+ > Cu 2+ > Pb 2+ > Zn 2+ ≥ Cd 2+. For pine bark, compost, spent yeast and prawn shell, quantities of previously adsorbed Pb and Cd desorbed in 0.01 M NaNO 3 electrolyte were negligible. However, 0.01 M HNO 3, and more particularly 0.10 and 0.50 M HNO 3 were effective at removing both adsorbed Pb and Cd. Using 0.10 M HNO 3 as the regenerating agent, pine bark and compost maintained their Pb and Cd adsorption capacity over eight successive adsorption/regeneration cycles. For mill mud and prawn shell, there was a pronounced decrease in adsorption capacity after only one regeneration cycle. A subsidiary experiment confirmed that acid pre-treatment of the latter two materials appreciably reduced their Pb and Cd adsorption capacity. This was ascribed to the metal adsorption capacity of prawn shell and mill mud being partially attributable to their significant CaCO 3 content and acid treatment induces dissolution of the CaCO 3. It was shown that in relation to both adsorption capacity and desorption/regeneration capability, composted green waste showed the greatest potential.
Keyword Cadmium
Copper
Lead
Zinc
Chromium
Biosorbents
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 30 August 2011

Document type: Journal Article
Sub-type: Article
Collections: School of Agriculture and Food Sciences
Official 2013 Collection
 
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