Journal
ARABIAN JOURNAL OF CHEMISTRY
Volume 12, Issue 8, Pages 4142-4149Publisher
ELSEVIER
DOI: 10.1016/j.arabjc.2016.04.017
Keywords
Biological sludge; Ferric activation; Pyrolysis; Sludge-based adsorbent; Adsorption; Heavy metal
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Funding
- National High Technology Research and Development Program of China [2011AA060906, 2012AA063508]
- Key Program of the National Natural Science Foundation of China [51038003]
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Ferric activation was novelly used to prepare sludge-based adsorbent (SBA) through pyrolysis treatment of biological sludge, and the adsorbents were applied to adsorb Pb2+ ions from aqueous solution. The ferric-activated SBA showed a favorable porous structure development and enhanced Pb2+ ions removal, with the maximum sorption capacity of 42.96 mg/g. The optimum adsorption was observed in a wide pH range of 4-6. The adsorption data fitted the Freundlich model well, indicating heterogeneous lead coverage on the adsorbents. Pseudo-second order model validated the kinetic data, suggesting that the rate-limiting step of the adsorption process was chemical sorption. The mechanism of Pb2+ ions removal involved ion exchange, precipitation, and surface complexation. The higher adsorption of ferric-activated SBA was due to the enhancive surface area that provided a larger number of active sites for adsorbate, the precipitation, and the formation of the surface complex FeOPb2+. The results demonstrate that ferric-activated SBA can be used as an effective adsorbent for Pb2+ ions removal from aqueous solution, which will also provide an option for sludge valorization. (C) 2016 The Authors. Published by Elsevier B.V.
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