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Title: Reactivity characteristics of nanoscale zerovalent iron-silica composites for trichloroethylene remediation
Authors: Zheng, Tonghua 
Zhan, Jingjing 
He, Jibao 
Day, Christopher 
Lu, Yunfeng 
McPherson, Gary L. 
Piringer, Gerhard 
John, Vijay T. 
Issue Date: 2008
Publisher: American Chemical Society
Source: Environmental Science & Technology, 42(12), 4494–4499
Journal: Environmental Science & Technology 
Abstract: Spherical silica particles containing nanoscale zerovalent iron were synthesized through an aerosol-assisted process. These particles are effective for groundwater remediation, with the environmentally benign silica particles serving as effective carriers for nanoiron transport. Incorporation of iron into porous sub-micrometer silica particles protects ferromagnetic iron nanoparticles from aggregation and may increase their subsurface mobility. Additionally, the presence of surface silanol groups on silica particles allows control of surface properties via silanol modification using organic functional groups. Aerosolized silica particles with functional alkyl moieties, such as ethyl groups on the surface, clearly adsorb solubilized trichloroethylene (TCE) in water. These materials may therefore act as adsorbents which have coupled reactivity characteristics. The nanoscale iron/silica composite particles with controlled surface properties have the potential to be efficiently applied for in situ source depletion and in the design of permeable reactive barriers.
ISSN: 0013-936X
DOI: 10.1021/es702214x
Rights: info:eu-repo/semantics/closedAccess
Appears in Collections:Energie-Umweltmanagement

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