Stable nano-scale iron suspension: preparation and transportat in porous media
Date Issued
2005
Date
2005
Author(s)
Wang, Yu-Hsiang
DOI
zh-TW
Abstract
Zero valent iron (ZVI) has been widely used for reducing the pollutants such as poly-chlorinated ethane and ethylene in contaminated groundwater aquifers. However, the cost for delivering and retaining ZVI at certain location in environmental matrixes may be high. It was my attempt to develop a technique that could stablize the nano-scale iron particles by adding different surfactants. So that, we may deploy nano-scale iron particles into groundwater aquifers by way of injection.
In this study, different surfactants were added to the suspension of nano iron particles that was prepared with a continuous manufacturing system. A commercialized, environmental-friendly dish-washing detergent was found to better keep nano-iron suspending than sodium dodecyl sulfate (SDS), which is a commonly used surfactant in literatures.
Stable suspension of nano-scale iron particles with diameter of 300nm to 1μm were made by mixing two solutions with concentrations of 0.009M FeSO4 and 0.053M NaBH4, respectively. Adding commercial detergent at a concentration of 6936 mg L-1 in the continuously manufacturing system produced stable iron particles in the suspension with size ranging from 40 to 150 nm observed by TEM.
Nano-scale iron suspension was passed through a 50-cm-long soil column to minic the transport in the field soil. About 50 % of nano-scale iron passed through the soil column.
Subjects
奈米鐵懸浮液
十二烷基硫酸鈉
市售清潔劑
土壤管柱
nano-scale iron suspension
sodium dodecyl sulfate
detergent
soil column
Type
thesis