Effects of monorhamnolipid and dirhamnolipid on sorption and desorption of triclosan in sediment-water system.
Effects of monorhamnolipid and dirhamnolipid on sorption and desorption of triclosan in sediment-water system.
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DOI：
10.1016/j.chemosphere.2012.08.036
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发表时间：
2013
期刊：
影响因子：
8.8
通讯作者：
Xiao-Yu Zhang;Qian Guo;Yongyou Hu;Hui Lin
中科院分区：
文献类型：
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作者：
Xiao-Yu Zhang;Qian Guo;Yongyou Hu;Hui Lin
研究了单鼠李糖脂（RL-F1）和双鼠李糖脂（RL-F2）在沉积物-水体系中对三氯生（TCS）吸附和解吸的影响。浴平衡实验结果表明，RL-F2对TCS的增溶作用明显强于RL-F1。沉积物对这两种鼠李糖脂的吸附与沉积物粘土含量高度相关。随着鼠李糖脂浓度的增加（0.05 ~ 7.5 mm）， TCS的表观分布系数Kd *减小，RL-F2在较高浓度（> ~ 2.5mM）时，TCS在水相中的分布能力更大。进一步的结果还表明，两种鼠李糖脂都可以促进沉积物中TCS的释放。RL-F2较RL-F1对低粘土含量沉积物中TCS的解吸效率更高。RL-F2 （5mM）的TCS解吸率Rd *是RL-F1的1.8 ~ 2.4倍。这些研究结果可为鼠李糖脂强化修复TCS污染沉积物技术的应用提供有益的指导。
The effects of monorhamnolipid (RL-F1) and dirhamnolipid (RL-F2) on the sorption and desorption of triclosan (TCS) in sediment–water system were investigated in this study. Results of the bath equilibrium experiments showed that RL-F2 provided much higher solubilization enhancement for TCS than RL-F1. Sorption of both rhamnolipids by the sediments was highly correlated with the sediment clay content. Moreover, the apparent distribution coefficients of TCS Kd∗decreased with the increase of rhamnolipid concentration (0.05–7.5mM), and RL-F2 presented a larger distribution capacity of TCS into the aqueous phase at relatively higher concentrations (>2.5mM). Further results also indicated that the release of TCS from sediment could be enhanced by both rhamnolipids. RL-F2 was more efficient than RL-F1 in desorbing TCS from the sediment with low clay content. The TCS desorption percentages Rd∗of RL-F2 (5mM) was 1.8–2.4 times that of RL-F1. These findings could provide useful guidelines for the application of rhamnolipid-enhanced remediation technologies for TCS contaminated sediment.