Journal
FRONTIERS IN CHEMISTRY
Volume 6, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2018.00080
Keywords
biochar; biomass; pyrolytic temperatures; antibiotics; adsorption; mechanisms
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Funding
- National Natural Science Foundation of China [51521006, 51609268]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2016B135]
- Key Project of Technological Innovation in the Field of Social Development of Hunan Province, China [2016SK2010, 2016SK2001]
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This paper comparatively investigated the removal efficiency and mechanisms of rice straw biochars prepared under three pyrolytic temperatures for two kinds of tetracycline and quinolone antibiotics (doxycycline and ciprofloxacin). The influencing factors of antibiotic adsorption (including biochar dosage, pH, background electrolytes, humic acid, initial antibiotics concentration, contact time, and temperature) were comprehensively studied. The results suggest that biochars produced at high-temperature [i.e., 700 degrees C (BC700)], have higher adsorption capacity for the two antibiotics than low-temperature (i.e., 300-500 degrees C) biochars (BC300 and BC500). Higher surface area gives rise to greater volume of micropores and mesopores, and higher graphitic surfaces of the BC700 contributed to its higher functionality. The maximum adsorption capacity was found to be in the following order: DOX > CIP. The pi-pi EDA interaction and hydrogen bonding might be the predominant adsorption mechanisms. Findings in this study highlight the important roles of high-temperature biochars in controlling the contamination of tetracycline and quinolone antibiotics in the environment.
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