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DOI: https://doi.org/10.4491/eer.2019.016
Estimating trichloroethylene, 1,1,1-trichloroethane, and atrazine dehalogenation reactivity of bimetallic nickel/iron nanoparticles by simple colorimetric assay by way of 4-chlorophenol reduction
Paul D. Mines1,2, Kamilla M. S. Kaarsholm1, Ariadni Droumpali1, Henrik R. Andersen1, and Yuhoon Hwang3
1Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, B115, DK-2800 Kongens Lyngby, Denmark
2Department of Micro- and Nanotechnology, Technical University of Denmark, Ørsteds Plads, B345C, DK-2800 Kongens Lyngby, Denmark
3Department of Environmental Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
Corresponding Author: Yuhoon Hwang ,Tel: +82-2-970-6626, Fax: +82-2-971-5776, Email: yhhwang@seoultech.ac.kr
Received: January 11, 2019;  Accepted: March 7, 2019.
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ABSTRACT
A number of different nanoscale zero-valent iron (nZVI) materials have been prepared and compared depending on the desired properties for the particular application, but different physicochemical properties of this prepared nZVI make it difficult to universally compare and standardize them to the same scale. In this study, we aimed to demonstrate a simple microplate-based colorimetric assay using 4-chlorophenol as an indicator with respect to the remediation of real treatment targets, such as trichloroethylene (TCE), 1,1,1-trichloroethane (TCA), and atrazine. Effect of nickel contents on 4-chlorophenol reduction was successfully investigated by the miniaturized colorimetric assay. In the same manner, the effect of nickel contents on dehalogenation of TCE, TCA, and atrazine was investigated and the pseudo-first-order kinetic constants were compared with the results for 4-chlorophenol. The similar pattern could be observed between 4-chlorophenol reduction obtained by colorimetric assay and TCE, TCA, atrazine reduction obtained by a traditional chromatographic method. The reaction kinetics does not match perfectly, but the degree of reaction can be estimated. Therefore, the colorimetric assay can be a useful and simple screening tool to determine nZVI reactivity toward halogenated organics before it is applied to a particular remediation site.
Keywords: Colorimetric assay | Dehalogenation | Nanoscale zero-valent iron | Trichloroethylene | 4-chlorophenol
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