Journal
CHEMOSPHERE
Volume 90, Issue 2, Pages 782-788Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2012.09.075
Keywords
Antibiotics; Endocrine disruptors; Environmental risk; Mobility; Pharmaceuticals
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Funding
- National Scientific Foundation of China [41173124, 40973081, U1137603]
- National High Technology Research and Development Plan [2008AA062602]
- Program for New Century Excellent Talents in University
- Chinese Ministry of Education
- Research Fund for Senior Visiting Scholar at State Key Laboratory of Pollution Control and Resource Reuse [PCRRF11032]
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Biochars were produced using a Dianchi Lake sediment at different temperatures and their sorption characteristics with five organic contaminants (with solubilities varied three orders of magnitude) were compared. Freundlich model showed satisfying fitting results of the sorption isotherms. Distinct decrease of nonlinear factors was observed for all five contaminants with pyrolysis suggesting wider energy distribution of the sorption sites after pyrolysis. No clear trend was observed between K-d and the chemical properties of the five chemicals. Phenanthrene and sulfamethoxazole (SMX) showed increased sorption with increased pyrolysis temperature, while the sorption of bisphenol A (BPA), ofloxacin (OFL) and norfloxacin (NOR) in the original sediment was comparable to those in the thermally treated samples. Electrostatic repulsion played an important role in SMX sorption as suggested by its lowest hydrophobicity-normalized sorption coefficients among the five chemicals. Possible sorption mechanisms were discussed and the sorption of SMX and PHE on the produced biochars were compared with natural adsorbents (including soils, sediments, and inorganic mineral particles). (C) 2012 Elsevier Ltd. All rights reserved.
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