Journal
ENVIRONMENTAL POLLUTION
Volume 159, Issue 2, Pages 550-556Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2010.10.010
Keywords
Organic contaminant; Soot; Adsorption; Absorption; Structural characteristics
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Funding
- Zhejiang Provincial Natural Science Foundation of China [R5100105]
- National Natural Science Foundation of China [41071210, 20737002]
- Foundation for the Author of National Excellent Doctoral Dissertation of China [200765]
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A biomass-generated soot was sequentially treated by HCl-HF solution, organic solvent, and oxidative acid to remove ash, extractable native organic matter (EOM), and amorphous carbon. The compositional heterogeneity and nano-structure of the untreated and treated soot samples were characterized by elemental analysis, thermal gravimetric analysis, BET-N-2 surface area, and electron microscopic analysis. Sorption properties of polar and nonpolar organic pollutants onto the soot samples were compared, and individual contributions of adsorption and absorption were quantified. The sorption isotherms for raw sample were practically linear, while were nonlinear for the pretreated-soot. The removal of EOM enhanced adsorption and reduced absorption, indicating that EOM served as a partitioning phase and simultaneously masked the adsorptive sites. By drastic-oxidation, the outer amorphous carbon and the inner disordered core of the soot particles were completely removed, and a fullerene-like nanoporous structure (aromatic shell) was created, which promoted additional pi-pi interaction between phenanthrene and the soot. (C) 2010 Elsevier Ltd. All rights reserved.
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