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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/21654

Title: Valorisation of heavy metals enriched tobacco biomass through slow pyrolysis and steam activation
Authors: Gonsalvesh-Musakova, Lenia
Yperman, Jan
Carleer, Robert
Mench, Michel
Herzig, Rolf
Vangronsveld, Jaco
Issue Date: 2016
Abstract: BACKGROUND: The disposal of metal-enriched plant biomass is an important and still unresolved issue associated with phytoextraction. Therefore, the aim of this study was to valorise these contaminated biomasses into valuable products, i.e. bio-chars and activated carbons (ACs), through slow pyrolysis followed by steam activation. The effects of pyrolysis/steam activation on metal availability in the chars/ACs were also evaluated. In addition, Cr(VI) adsorption by these ACs in aqueous solutions was studied. RESULTS: Relevant chars/ACs yields were obtained due to applied thermochemical treatments. Leachability of heavy metals from those products was limited indicating that they may be safely applied as adsorption media. Prepared ACs demonstrated good Cr(VI) adsorption capacities occurring through a 'coupled adsorption-reduction' mechanism. It was found that Cr(VI) removal strongly depended on pH of Cr(VI) solutions and was higher for ACs activated at 800 degrees C. Among applied isotherm adsorption models, i.e. Langmuir and Freundlich, a better fit was obtained with the Langmuir model corresponding to monolayer coverage sorption of Cr(VI) on ACs surface. CONCLUSIONS: Heavy metals enriched biomass can be successfully valorised through slow pyrolysis/steam activation into value added products, i.e. ACs that can be used as efficient and safe adsorbents for Cr(VI) removal. (C) 2016 Society of Chemical Industry.
Notes: [Gonsalvesh, Lenia] Assen Zlatarov Univ, Cent Sci Res Lab, Yakimov Str 1, Burgas, Bulgaria. [Gonsalvesh, Lenia] Bulgarian Acad Sci, Ctr Phytochem, Inst Organ Chem, BU-1113 Sofia, Bulgaria. [Yperman, Jan; Carleer, Robert; Vangronsveld, Jaco] Hasselt Univ, Ctr Environm Sci, Agoralaan Bldg D, B-3590 Diepenbeek, Belgium. [Mench, Michel] Univ Bordeaux, UMR BIOGECO INRA 1202, INRA, F-33405 Talence, France. [Herzig, Rolf] Phytotech Fdn Umweltbeobachtung & Oekolog Planung, Quartiergasse 12, CH-3013 Bern, Switzerland.
URI: http://hdl.handle.net/1942/21654
DOI: 10.1002/jctb.4889
ISI #: 000375768300003
ISSN: 0268-2575
Category: A1
Type: Journal Contribution
Validation: ecoom, 2017
Appears in Collections: Research publications

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