State Key Laboratory of Water Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
Bioresour Technol. 2011 Nov;102(21):9897-903. doi: 10.1016/j.biortech.2011.08.036. Epub 2011 Aug 11.
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 (K(OC)) 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.
在不同热解温度（HTT）下产生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特性。我们研究了来自木质和草本原料的生物炭对氟咯草酮（NORO）和氟酮唑（FLUN）的吸附行为差异，这些生物炭是在不同的 HTT 下产生的。无定形生物炭（HTT=400°C）对这两种除草剂表现出最高的吸附参数（K（OC）），这强调了这些炭中芳香部分无定形结构排列的重要性。生物炭芳香度与等温非线性（n）之间的负相关表明，n 值主要与总芳香 C 含量有关，而不是与各个相中的芳香 C 含量有关。FLUN 和 NORO 对低温生物炭（HTT=400°C）的吸附分别比沉积物样品高约 1100 倍和 6400 倍，这证实了将低温生物炭应用于耕地可能会降低 FLUN 和 NORO 的迁移性，从而防止不必要的除草剂淋溶和随后对敏感水体的污染。
