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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 13, No. 1, 2016, pp. 327-338
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Bioline Code: st16031
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 13, No. 1, 2016, pp. 327-338
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Characterization and use of biosorbents prepared from forestry waste and their washed extracts to reduce/remove chromium
Santos, F.A.; Alban, L.; Frankenberg, C.L.C. & Pires, M.
Abstract
This study aimed to characterize forestry waste
of araucaria, eucalyptus and pine and their aqueous extracts
to evaluate their performance in the reduction/removal
biosorption of chromium. The biosorbents present a complex
and rich composition of both organic and inorganic
solubilizable compounds. These results confirmed the need
of biomass pretreatment for its adequate use as biosorbent.
The extracts obtained in the washing cycles at different
pHs presented high organic loads. The pine is distinguished
as the best biosorbent, and its performance is increased by
prior washing in natural medium. Eucalyptus extract produces
fastest Cr(VI) reduction due to the presence of high
concentration of dissolved organic matter. The washing
process of the biosorbents, besides improving the efficiency
of overall chromium biosorption, prevents mobilization
of the solubilizable compounds in the treated
effluent. The biosorbents tested have potential for application
in the treatment of wastewater containing chromium,
at least in similar levels to those studied.
Keywords
Forestry waste; Biosorption; Low-cost biosorbents; Chromium
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