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Title: Transport characteristics of nanoscale functional zerovalent iron/silica composites for in situ remediation of trichloroethylene
Authors: Zhan, Jingjing 
Zheng, Tonghua 
Piringer, Gerhard 
Day, Christopher 
McPherson, Gary L. 
Lu, Yunfeng 
Papadopoulos, Kyriakos D. 
John, Vijay T. 
Issue Date: 2008
Publisher: American Chemical Society
Source: Environmental Science & Technology, 42(23), 8871–8876
Journal: Environmental Science & Technology 
Abstract: Effective in situ remediation of groundwater requires the successful delivery of reactive iron particles through soil. In this paper we report the transport characteristics of nanoscale zerovalent iron entrapped in porous silica particles and prepared through an aerosol-assisted process. The entrapment of iron nanoparticles into the silica matrix prevents their aggregation while maintaining the particlesʼ reactivity. Furthermore, the silica particles are functionalized with alkyl groups and are extremely efficient in adsorbing dissolved trichloroethylene (TCE). Because of synthesis through the aerosol route, the particles are of the optimal size range (0.1−1 μm) for mobility through sediments. Column and capillary transport experiments confirm that the particles move far more effectively through model soils than commercially available uncoated nanoscale reactive iron particles. Microcapillary experiments indicate that the particles partition to the interface of TCE droplets, further enhancing their potential for dense non-aqueous-phase liquid source-zone remediation.
ISSN: 0013-936X
DOI: 10.1021/es800387p
Appears in Collections:Energie-Umweltmanagement

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