Journal
ENVIRONMENTAL POLLUTION
Volume 181, Issue -, Pages 60-67Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2013.05.056
Keywords
Biochar; Sulfamethoxazole; Antibiotics; Sorption; Inorganic fractions
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Funding
- Shandong Excellent Young Scientist Program [BS2010HZ023]
- Ocean Public Welfare Scientific Research Project [201305021]
- USDA Hatch Program [MAS 00982]
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Sorption of sulfonamides on biochars is poorly understood, thus sulfamethoxazole (SMX) sorption on biochars produced at 300-600 degrees C was determined as a function of pH and SMX concentration, as well as the inorganic fractions in the biochars. Neutral SMX molecules (SMX0) were dominant for sorption at pH 1.0-6.0. Above pH 7.0, although biochars surfaces were negatively-charged, anionic SMX species sorption increased with pH and is regulated via charge-assisted H-bonds. SMX0 sorption at pH 5.0 was nonlinear and adsorption-dominant for all the biochars via hydrophobic interaction, pi-pi electron donor-acceptor interaction and pore-filling. The removal of inorganic fraction reduced SMX sorption by low-temperature biochars (e.g., 300 degrees C), but enhanced the sorption by high-temperature biochars (e.g., 600 degrees C) due to the temperature-dependent inorganic fractions in the biochars. These observations are useful for producing designer biochars as engineered sorbents to reduce the bioavailability of antibiotics and/or predict the fate of sulfonamides in biochar-amended soils. (C) 2013 Elsevier Ltd. All rights reserved.
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