期刊
ENVIRONMENTAL TECHNOLOGY
卷 37, 期 12, 页码 1530-1538出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2015.1120784
关键词
remediation; mobility; porous media; Nanoscale zero-valent iron; column experiments
资金
- Technology Agency of the Czech Republic [TA02020654]
Laboratory column experiments were conducted to evaluate the effect of previously described silica coating method on the transport of nanoscale zero-valent iron (nZVI) in porous media. The silica coating method showed the potential to prevent the agglomeration of nZVI. Transport experiments were conducted using laboratory-scale sand-packed columns at conditions that were very similar of natural groundwater. Transport properties of non-coated and silica-coated nZVI are investigated in columns of 40 cm length, which were filled with porous media. A suspension was injected in three different Fe particle concentrations (100, 500, and 1000 mg/L) at flow 5 mL/min. Experimental results were compared using nanoparticle attachment efficiency and travel distances which were calculated by classical particle filtration theory. It was found that non-coated particles were essentially immobile in porous media. In contrast, silica-coated particles showed significant transport distances at the tested conditions. Results of this study suggest that silica can increase nZVI mobility in the subsurface.
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