Sorption of fluorinated herbicides to plant biomass-derived biochars as a function of molecular structure.
Sorption of fluorinated herbicides to plant biomass-derived biochars as a function of molecular structure.
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DOI：
10.1016/j.biortech.2011.08.036
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发表时间：
2011-11
影响因子：
11.4
通讯作者：
Ke Sun;M. Keiluweit;M. Kleber;Z. Pan;B. Xing
中科院分区：
文献类型：
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作者：
Ke Sun;M. Keiluweit;M. Kleber;Z. Pan;B. Xing
在不同热处理温度 (HTT) 下生产的生物炭在分子上是不同的，因此预计会表现出不同的吸附剂特性。我们研究了去氟草酮 (NORO) 和氟啶酮 (FLUN) 对不同 HTT 下生产的木材和草原料生物炭的吸附行为的差异。无定形生物炭（HTT=400°C）对两种除草剂表现出最高的吸附参数（KOC），强调了这些炭中芳香族部分无定形结构排列的重要性。生物炭芳香性和等温线非线性 (n) 之间的负相关表明 n 值主要与总芳香族 C 含量相关，而不是与各个相中的芳香族 C 含量相关。低温生物炭（HTT=400°C）对 FLUN 和 NORO 的吸附分别比沉积物样品高约 1100 倍和 6400 倍，证实将低温生物炭应用于耕地可以降低 FLUN 和 NORO 的移动性，从而防止不必要的除草剂浸出和随后对敏感水体的污染。
Biochars produced at different heat treatment temperatures (HTT) are molecularly distinct and thus expected to show variable sorbent characteristics. We investigated the difference in sorption behavior of norflurazon (NORO) and fluridone (FLUN) to biochars from wood and grass feedstocks produced at different HTT. Amorphous biochars (HTT=400°C) exhibited the highest sorption parameter (KOC) for the two herbicides, emphasizing the importance of amorphous structural arrangement of aromatic moieties in these chars. Negative correlation between biochar aromaticity and isotherm nonlinearity (n) suggests that the n values were related mainly to total aromatic C content, not to that in the individual phases. Sorption of FLUN and NORO to low-temperature biochars (HTT=400°C) was about 1100 times and 6400 times greater, respectively, than a sediment sample, confirming that applications of low-temperature biochars to arable soils may reduce the mobility of FLUN and NORO, thus preventing unwanted herbicide leaching and subsequent contamination of sensitive water bodies.