Geochemical and Spectroscopic Investigations of Cd and Pb Sorption Mechanisms on Contrasting Biochars: Engineering Implications

0432684 - ÚCHP 2015 RIV NL eng J - Journal Article
Trakal, L. - Bingöl, D. - Pohořelý, Michael - Hruška, M. - Komárek, M.
Geochemical and Spectroscopic Investigations of Cd and Pb Sorption Mechanisms on Contrasting Biochars: Engineering Implications.
Bioresource Technology. Roč. 171, NOV 2014 (2014), s. 442-451. ISSN 0960-8524. E-ISSN 1873-2976
R&D Projects: GA ČR(CZ) GA14-02219S
Grant - others:GA MŠMT(CZ) LD13068
Institutional support: RVO:67985858
Keywords : biochar * metals * sorption mechanisms
Subject RIV: DK - Soil Contamination ; De-contamination incl. Pesticides
Impact factor: 4.494, year: 2014

Biochars prepared from nut shells, plum stones, wheat straws, grape stalks and grape husks were tested as potential sorbents for Cd and Pb. Mechanisms responsible for metal retention were investigated and optimal sorption conditions were evaluated using the RSM approach. Results indicated that all tested biochars can effectively remove Cd and Pb from aqueous solution (efficiency varied between 43.8% and 100%). The removal rate of both metals is the least affected by the biochar morphology and specific surface but this removal efficiency is strongly pH-dependent. Results of variable metal removal combined with different optimized conditions explain the different metal sorption mechanisms, where the predominant mechanism is ion exchange. In addition, this mechanism showed very strong binding of sorbed metals as confirmed by the post-desorption of the fully metal-loaded biochars. Finally, these biochars could thus also be applicable for metal contaminated soils to reduce mobility and bioavailability of Cd and Pb.
Permanent Link: http://hdl.handle.net/11104/0239269