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Bioresour Technol. 2013 Jul;140:406-13. doi: 10.1016/j.biortech.2013.04.116. Epub 2013 May 9.

Biochars prepared from anaerobic digestion residue, palm bark, and eucalyptus for adsorption of cationic methylene blue dye: characterization, equilibrium, and kinetic studies.

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1
Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China.

Abstract

Biochars prepared from anaerobic digestion residue (BC-R), palm bark (BC-PB) and eucalyptus (BC-E) were used as sorbents for removal of cationic methylene blue dye (MB). The FE-SEM images indicated that the biochars have a well-developed pore structure, and the Brunauer-Emmett-Teller surface areas of BC-R, BC-PB, and BC-E were 7.60, 2.46, and 10.35 m(2)g(-1), respectively. The efficiencies of MB removal in the samples with initial concentrations of 5 mg L(-1) at pH 7.0 and 40°C by BC-R, BC-PB, and BC-E after 2h were 99.5%, 99.3%, and 86.1%, respectively. Pseudo-second-order kinetics was the most suitable model for describing the adsorption of MB onto the biochars. The experimental data were best described by the Langmuir isotherm model, with a maximum monolayer adsorption capacity of 9.50 mg g(-1) at 40°C for BC-R. The biochars produced from the three types of solid waste showed considerable potential for adsorption.

PMID:
23714096
DOI:
10.1016/j.biortech.2013.04.116
[Indexed for MEDLINE]
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