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Evaluation of torrefied poplar-biomass as a low-cost sorbent for lead and terbium removal from aqueous solutions and energy co-generation

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2019 Chem Eng J .pdf (1,745Mb)
 
10.1016/j.cej.2018.12.148
 
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hdl:2117/127877

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Demey Cedeño, Hary
Melkior, Thierry
Chatroux, A.
Attar, Keltoum
Sastre Requena, Ana MaríaMés informacióMés informacióMés informació
Document typeArticle
Defense date2019-04-01
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
This work is protected by the corresponding intellectual and industrial property rights. Except where otherwise noted, its contents are licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
Two low-cost renewable poplar-based materials were manufactured in this work for energy production and as sorbents for lead and terbium removal from aqueous effluents. Torrefaction was used as a pretreatment process for conditioning the raw biomass. Two different operating conditions were used in the multiple-hearth furnace of the torrefaction pilot-plant: i) 250¿°C; ii) 280¿°C, with residence times of 75¿min and 60¿min, respectively. The raw and torrefied biomasses have been characterized using SEM-EDX, FTIR, TGA, XRD and elemental analyses (C, H, N, S, O); an increase of the torrefaction severity, results in an increase of the carbon/oxygen ratio and in a greater mass loss (21% at 250¿°C, and 53% at 280¿°C). The torrefaction had a positive impact on the sorption of metals, it allowed the increase of lignin content of the manufactured materials, and it allowed the storage of the sorbents for longer time with reduced moisture content. The equilibrium studies were performed in batch system and the experimental data were described with the Sips equation. The maximum sorption capacity was found as 30¿mg¿g-1 for lead and 9.4¿mg¿g-1 for terbium (at pH 4). The kinetic profiles were fitted using the pseudo-second order rate equation. The regeneration of the sorbent was demonstrated by three sorption-desorption cycles using dilute HNO3 solution (0.1¿M) as eluent for metal recovery
CitationDemey, H. [et al.]. Evaluation of torrefied poplar-biomass as a low-cost sorbent for lead and terbium removal from aqueous solutions and energy co-generation. "Chemical engineering journal", 1 Abril 2019, vol. 361, p. 839-852. 
URIhttp://hdl.handle.net/2117/127877
DOI10.1016/j.cej.2018.12.148
ISSN1385-8947
Publisher versionhttps://www.sciencedirect.com/science/article/pii/S1385894718326342
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