Enhanced Delivery of Nanoscale Zero-Valent Iron in Porous Media by Sodium Dodecyl Sulfate Solution and Foam
Enhanced Delivery of Nanoscale Zero-Valent Iron in Porous Media by Sodium Dodecyl Sulfate Solution and Foam
复制标题
十二烷基硫酸钠溶液和泡沫增强多孔介质中纳米级零价铁的输送
DOI：
10.1089/ees.2014.0529
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发表时间：
2015-08
影响因子：
1.8
通讯作者：
Chuan-Yu Qin
中科院分区：
文献类型：
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作者：
Yan Su;Lu-Lu Li;Yong-Sheng Zhao;Chuan-Yu Qin
摘要研究了十二烷基硫酸钠（SDS）泡沫和溶液在非饱和多孔介质中递送纳米级零价铁（nZVI）的可行性。研究发现了三个主要结果。首先，批量实验表明，随着搅拌器搅拌速度的增加，泡沫质量和携带nZVI的能力有所提高。然而，随着nZVI浓度的增加，泡沫中nZVI的分布逐渐变得不均匀。nZVI的存在并未降低泡沫的稳定性。其次，柱上实验发现，SDS-nZVI悬浮液和载nZVI泡沫的进样nZVI出柱率高于裸nZVI悬浮液。因此，SDS溶液和泡沫是nZVI输送的理想载体。最后，通过坦克试验研究了三种车辆携带的nZVI的迁移和分布特征。与裸nZVI悬浮液相比，SDS-nZVI悬浮液和载nZVI泡沫在多孔介质中对nZVI的影响范围更小。
Abstract The feasibility of using sodium dodecyl sulfate (SDS) foam and solution to deliver nanoscale zero-valent iron (nZVI) in unsaturated porous media was investigated. Three main results were found. First, batch experiments showed that the foam quality and capability to carry nZVI improved with increased agitator stirring speed. However, the distribution of nZVI in foams gradually became nonuniform with increased nZVI concentration. Presence of nZVI did not reduce foam stability. Second, column experiments revealed that fractions of injected nZVI exiting the column for SDS-nZVI suspension and nZVI-laden foams were higher than that for bare nZVI suspension. Thus, the SDS solution and foams were promising vehicles for nZVI delivery. Finally, tank experiments were conducted to study the migration and distribution characteristics of nZVI carried by the three vehicles. Compared with those of bare nZVI suspension, influence regions of nZVI in porous media for SDS-nZVI suspension and nZVI-laden foams were si...