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Fate of nitrogen species in nitrate reduction by nanoscale zero valent iron and characterization of the reaction kinetics.
Water Sci Technol. 2010; 61(3):705-12.WS

Abstract

This study investigates the fate of nitrogen species during nitrate reduction by nanoscale zero valent iron (NZVI) as well as the related kinetics. The NZVI used for the experiments was prepared by chemical reduction without a stabilizing agent. The pseudo first order kinetic constant of nitrate reduction at 30 degrees C with an NZVI/nitrate ratio of 1.25:1, which were the reference conditions of this study, was 4.08 h(-1) (R(2)=0.955). A nitrogen mass balance was established by quantitative analysis of aqueous-phase and gas-phase nitrogen species. The results confirm that the nitrate was converted to ammonium ion, that ammonia stripping subsequently occurred under a strong alkaline condition, and that the total amount of aqueous nitrogen was consequently reduced. The nitrate reduction rate also increased with a lower pH and a higher temperature when microscale ZVI was used. However, in contrast to the reaction by microscale ZVI, the nitrate reduction rate by NZVI was higher for an unbuffered condition, possibly due to the abundance of surface atoms and the smaller size.

Authors+Show Affiliations

Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 305-701, South Korea. yoshi-indagts@kaist.ac.krNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

20150707

Citation

Hwang, Y H., et al. "Fate of Nitrogen Species in Nitrate Reduction By Nanoscale Zero Valent Iron and Characterization of the Reaction Kinetics." Water Science and Technology : a Journal of the International Association On Water Pollution Research, vol. 61, no. 3, 2010, pp. 705-12.
Hwang YH, Kim DG, Ahn YT, et al. Fate of nitrogen species in nitrate reduction by nanoscale zero valent iron and characterization of the reaction kinetics. Water Sci Technol. 2010;61(3):705-12.
Hwang, Y. H., Kim, D. G., Ahn, Y. T., Moon, C. M., & Shin, H. S. (2010). Fate of nitrogen species in nitrate reduction by nanoscale zero valent iron and characterization of the reaction kinetics. Water Science and Technology : a Journal of the International Association On Water Pollution Research, 61(3), 705-12. https://doi.org/10.2166/wst.2010.895
Hwang YH, et al. Fate of Nitrogen Species in Nitrate Reduction By Nanoscale Zero Valent Iron and Characterization of the Reaction Kinetics. Water Sci Technol. 2010;61(3):705-12. PubMed PMID: 20150707.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fate of nitrogen species in nitrate reduction by nanoscale zero valent iron and characterization of the reaction kinetics. AU - Hwang,Y H, AU - Kim,D G, AU - Ahn,Y T, AU - Moon,C M, AU - Shin,H S, PY - 2010/2/13/entrez PY - 2010/2/13/pubmed PY - 2010/4/30/medline SP - 705 EP - 12 JF - Water science and technology : a journal of the International Association on Water Pollution Research JO - Water Sci. Technol. VL - 61 IS - 3 N2 - This study investigates the fate of nitrogen species during nitrate reduction by nanoscale zero valent iron (NZVI) as well as the related kinetics. The NZVI used for the experiments was prepared by chemical reduction without a stabilizing agent. The pseudo first order kinetic constant of nitrate reduction at 30 degrees C with an NZVI/nitrate ratio of 1.25:1, which were the reference conditions of this study, was 4.08 h(-1) (R(2)=0.955). A nitrogen mass balance was established by quantitative analysis of aqueous-phase and gas-phase nitrogen species. The results confirm that the nitrate was converted to ammonium ion, that ammonia stripping subsequently occurred under a strong alkaline condition, and that the total amount of aqueous nitrogen was consequently reduced. The nitrate reduction rate also increased with a lower pH and a higher temperature when microscale ZVI was used. However, in contrast to the reaction by microscale ZVI, the nitrate reduction rate by NZVI was higher for an unbuffered condition, possibly due to the abundance of surface atoms and the smaller size. SN - 0273-1223 UR - https://www.unboundmedicine.com/medline/citation/20150707/Fate_of_nitrogen_species_in_nitrate_reduction_by_nanoscale_zero_valent_iron_and_characterization_of_the_reaction_kinetics_ L2 - https://iwaponline.com/wst/article-lookup/doi/10.2166/wst.2010.895 DB - PRIME DP - Unbound Medicine ER -