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| Sorption of acetochlor by biochars derived from wood dust and swine manure at different pyrolytic temperatures |
| Received:July 24, 2015 |
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| KeyWord:biochar;acetochlor;adsorption;CO2-surface area;surface polarity;aromatic C |
| Author Name | Affiliation | E-mail | | WANG Zi-ying | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | QIU Meng-yi | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | YANG Yan | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | SUN Ke | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | sunke@bnu.edu.cn |
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| Abstract: |
| Raw material and pyrolytic temperature of biochar greatly influence its properties and thus pollutant adsorption. Fourteen biochars obtained from two raw material sources(wood dust and swine manure) at seven pyrolytic temperatures were used to investigate their adsorption of acetochlor. As pyrolytic temperature increased, the polarity of biochars decreased, while their aromaticity and CO2-surface area(CO2-SA) enhanced. The organic carbon(OC) concentrations on the biochar surface were generally higher than the corresponding bulk OC contents. Acetochlor had higher sorption capacity on swine manure biochars(SWBs) than on wood dust biochars(WDBs), mainly due to higher ash content of SWBs. At low pyrolytic temperatures(< 450 ℃), a positive correlation between biochar surface polarity[(O+N)/C] and the sorption affinity lgKoc indicated that the surface polarity might dominate the sorption of acetochlor by WDBs through H-bonding interaction. At high pyrolytic temperatures(≥ 450 ℃), however, a positive correlation between the biochar aromaticity and lgKoc suggested that aromatic C might control the sorption of acetochlor on biochars. Moreover, there were significant correlations between sorption coefficients(nonlinearity index n and lgKoc) and OC normalized CO2-SA(CO2-SA/OC) of biochars, indicating that pore filling could be a factor affecting acetochlor adsorption on biochars. |
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