Journal
CHEMOSPHERE
Volume 144, Issue -, Pages 285-291Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2015.08.042
Keywords
Biochar; CO2-surface area; Surface polarity; Sorption; Minerals
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Funding
- Fund for Innovative Research Group of the National Natural Science Foundation of China [51421065]
- National Natural Science Foundation of China [41273106]
- USDA Hatch Program [MAS 00982]
- Beijing Higher Education Young Elite Teacher Project
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
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Sorption behavior of acetochlor (ACE), dibutyl phthalate (DBP), 17 alpha-Ethynyl estradiol (EE2) and phenanthrene (PHE) with biochars produced from three feedstocks (maize straw (MABs), pine wood dust (WDBs) and swine manure (SWBs)) at seven heat treatment temperatures (HTTs) was evaluated. The bulk polarity of these biochars declined with increasing HIT while the aromaticity and CO2-surface area (CO2-SA) rose. The surface OC contents of biochars were generally higher than bulk OC contents. The organic carbon (OC)-normalized CO2-SA (CO2-SA/OC) of biochars significantly correlated with the sorption coefficients (n and logK(oc)), suggesting that pore filling could dominate the sorption of tested sorbates. SWBs had higher logK(oc) values compared to MABs and WDBs, due to their higher ash contents. Additionally, the logK(oc) values for MABs was relatively greater than that for WDBs at low HTTs (<= 400 degrees C), probably resulting from the higher CO2-SA/OC, ash contents and aromaticity of MABs. Surface polarity and the aliphatic C may dominate the sorption of WDBs obtained at relatively low HTFs (<= 400 degrees C), while aromatic C affects the sorption of biochars at high HTFs. Results of this work aid to deepen our understanding of the sorption mechanisms, which is pivotal to wise utilization of biochars as sorbents for hazardous organic compounds. (C) 2015 Elsevier Ltd. All rights reserved.
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