Sorption of simazine to corn straw biochars prepared at different pyrolytic temperatures
Sorption of simazine to corn straw biochars prepared at different pyrolytic temperatures
复制标题
不同热解温度制备的玉米秸秆生物炭对西玛津的吸附
DOI：
10.1016/j.envpol.2011.06.012
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发表时间：
2011-10-01
影响因子：
8.9
通讯作者：
Zhao, Ye
中科院分区：
文献类型：
--
作者：
Zhang, Guixiang;Zhang, Qing;Zhao, Ye
研究了西玛津对在不同温度（100-600℃）下制备的玉米秸秆生物炭的吸附，以了解其吸附行为受生物炭特性的影响。通过元素分析、BET-N-2 表面积 (SA)、MR 和 C-13 NMR 来表征生物炭。 Freundlich 模型和双模式模型很好地描述了吸附等温线。 log K-oc 值与芳香族 C 含量之间的正相关性以及 log K-oc 值与 (O + N)/C 比率之间的负相关性表明富含芳香族的生物炭与西玛嗪具有高结合亲和力（电荷转移 (pi-pi*) 相互作用），并且疏水性结合可能分别压倒 H-键合。双模式模型结果表明，吸附对总吸附的贡献随着碳化程度的增加而增加。吸附量 (Q(ad)) 和 SA 之间的正相关表明孔隙填充机制。我们的结果与其他吸附剂获得的结果的比较表明，在较高温度下生产的玉米秸秆生物炭可以有效地保留西玛津。这些观察结果将有助于设计生物炭作为工程吸附剂来去除三嗪除草剂。 (C) 2011 Elsevier Ltd. 保留所有权利。
Simazine sorption to corn straw biochars prepared at various temperatures (100-600 degrees C) was examined to understand its sorption behavior as influenced by characteristics of biochars. Biochars were characterized via elemental analysis, BET-N-2 surface area (SA), MR and C-13 NMR. Freundlich and dual-mode models described sorption isotherms well. Positive correlation between log K-oc values and aromatic C contents and negative correlation between log K-oc values and (O + N)/C ratios indicate aromatic-rich biochars have high binding affinity to simazine (charge transfer (pi-pi*) interactions) and hydrophobic binding may overwhelm H-bonding, respectively. Dual-mode model results suggest adsorption contribution to total sorption increases with carbonization degree. Positive correlation between amounts of adsorption (Q(ad)) and SA indicates pore-filling mechanism. Comparison between our results and those obtained with other sorbents indicates corn straw biochars produced at higher temperature can effectively retain simazine. These observations will be helpful for designing biochars as engineered sorbents to remove triazine herbicides. (C) 2011 Elsevier Ltd. All rights reserved.