期刊
ENVIRONMENTAL POLLUTION
卷 186, 期 -, 页码 187-194出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2013.11.022
关键词
Adsorption; Biochar; Sulfonamide; Thermochemical condition; Aqueous solution chemistry
资金
- National Science Foundation of China [21225729]
- National Key Basic Research Program of China [2014CB114403]
- Collaborative Innovation Center for Regional Environmental Quality
The main objective of this study was to understand the key factors and mechanisms controlling adsorption of sulfonamides to biochars. Batch adsorption experiments were performed for sulfamethoxazole and sulfapyridine to three pine-wood biochars prepared under different thermochemical conditions: pyrolysis at 400 degrees C (C400) and 500 degrees C (C500), and pyrolysis at 500 degrees C followed with hydrogenation (C500-H). For both sulfonamides, the adsorbent surface area-normalized adsorption was stronger to C500 than to C400. This is attributable to the enhanced pi-pi it electron-donor-acceptor interaction with the carbon surface of C500 due to the higher degree of graphitization. Despite the relatively large difference in surface O-functionality content between C500 (12.2%) and C500-H (6.6%), the two biochars exhibited nearly identical adsorbent surface area-normalized adsorption, indicating negligible role of surface O-functionalities in the adsorption to these adsorbents. Effects of solution chemistry conditions (pH, Cu2+, and dissolved soil humic acid) on adsorption were examined. (C) 2013 Elsevier Ltd. All rights reserved.
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