Abstract
Remediation of contaminated groundwater by nanoscale zero-valent iron (nZVI) is widely becoming a leading environmentally friendly solution throughout the globe. Since a wide range of various nZVI-containing materials have been developed for effective remediation, it is necessary to determine an appropriate way to terminate the reactivity of any nZVI-containing material for a practical experimental procedure. In this study, bimetallic Ni/Fe-NPs were prepared to enhance overall reduction kinetics owing to the catalytic reactivity of nickel on the surface of nZVI. We have tested several chemical strategies in order to terminate nZVI reactivity without altering the concentration of volatile compounds in the solution. The strategies include surface passivation in alkaline conditions by addition of carbonate, and consumption of nZVI by a reaction competitor. Four halogenated chemicals, trichloroethylene, 1,1,1-trichloroethane, atrazine, and 4-chlorophenol, were selected and tested as model groundwater contaminants. Addition of carbonate to passivate the nZVI surface was not effective for trichloroethylene. Nitrate and then bromate were applied to competitively consume nZVI by their faster reduction kinetics. Bromate proved to be more effective than nitrate, subsequently terminating nZVI reactivity for all four of the tested halogenated compounds. Furthermore, the suggested termination method using bromate was successfully applied to obtain trichloroethylene reduction kinetics. Herein, we report the simple and effective method to terminate the reactivity of nZVI by addition of a reducing reactivity competitor.
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Acknowledgements
P.D.M. and H.R.A. acknowledge funding for this study from the Technical University of Denmark (DTU) through the KAIST-DTU Signature Project on Integrated Water Technology. Y.H. acknowledges fundings for this study though a DFF-Individual Postdoctoral Grant from the Danish Council for Independent Research—Technology and Production Science (4005-00393B) and “The GAIA Project” by the Korea Ministry of Environment (RE201402059). W.L. acknowledges funding supported by Korea Ministry of Environment (MOE) as “Geo-Advanced Innovative Action” Program (Project No. 2015000560002). We would also like to thank Wilhelmus Huyzer from the DTU Center for Electron Nanoscopy (DTU-CEN) for his assistance with the nanoparticle characterization.
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This study was funded by the Technical University of Denmark (DTU) through the KAIST-DTU Signature Project on Integrated Water Technology, a DFF-Individual Postdoctoral Grant from the Danish Council for Independent Research—Technology and Production Science (4005-00393B), and “The GAIA Project” by the Korea Ministry of Environment (RE201402059, 2015000560002).
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Mines, P.D., Kaarsholm, K.M.S., Droumpali, A. et al. Termination of nanoscale zero-valent iron reactivity by addition of bromate as a reducing reactivity competitor. J Nanopart Res 19, 301 (2017). https://doi.org/10.1007/s11051-017-4000-x
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DOI: https://doi.org/10.1007/s11051-017-4000-x