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Application of Nano-Zero Valent Iron for Treating Metolachlor in Aqueous Solution
Abstract:Water, soil and sediment contaminated with metolachlor poses a threat to the environment and human health. We determined the effectiveness of nano-zerovalent iron (NZVI) to dechlorinate metolachlor [2-chloro-n-(2-ethyl-6-methyl-phenyl)-n- (1-methoxypropan-2-yl)acetamide] in pH solution and the presence of aluminium salt. The optimum dosage of degradation of 100 mlL-1 metolachlor was 1% (w/v) NZVI. The degradation kinetic rate (kobs) was 0.218×10-3 min-1 and specific first-order rates (kSA) was 8.72×10-7 L m-2min-1. By treating aqueous solutions of metolachlor with NZVI, metolachlor destruction rate were increased as the pH decrease from 10 to 4. Lowering solution pH removes Fe (III) passivating layers from the NZVI and makes it free for reductive transformations. Destruction kinetic rates were 20.8×10-3 min-1 for pH4, 18.9×10-3 min-1 for pH7, 13.8×10-3 min-1 for pH10. In addition, destruction kinetic of metolachlor by NZVI was enhanced when aluminium sulfate was added. The destruction kinetic rate were 20.4×10-3 min-1 for 0.05% Al(SO4)3 and 60×10-3 min-1 for 0.1% Al(SO4)3.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1063284Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1103
 L.R. Holden, and J.A. Graham, "Results of the National Alachlor Well Water Survey," Journal of Environmental Science and Technology ,vol. 26, pp. 935-943, 1992.
 R. F. Spalding, M. E. Exner, D. D. Snow, D. A. Cassada, M. E. Burbach, and S. J. Monson, "Herbicides in Ground Water beneath Nebraska-s Management Systems Evaluation Area," Journal of Environmental Quality, vol. 32, pp. 92-99, Feb. 2002.
 K.B. Gregory, P. Larese-Casanova, G.F. Parkin, and M.M. Scherer, " Abiotic transformation of hexahydro-1,3,5-trinitro-1,3,5-triazine by Fe(ll) bound to magnetite," Journal of Environmental Science and Technology, vol. 38, pp. 1408-1414, Jan. 2004.
 Y-P Sun, X. Li, J. Cao, W. Zhang, and H. P. Wang, "Characterization of zero-valent iron nanoparticles," Journal of Advances in Colloid and Interface Science, vol. 120, pp. 47-56, May. 2006.
 X-Q Li, D. W. Elliott, and W-X Zhang, "Zero-Valent Iron Nanoparticles for Abatement of Environmental Pollutants: Materials and Engineering Aspects," Journal of Critical Reviews in Solid State and Materials Sciences, vol. 31, pp. 111-122, 2006.
 T. Johnson, M .M . Scherer, and P. Trantnyek, "Kinetics of halogenated Organic Compound Degradation by Iron Metal," Journal of Environmental Science and Technology, vol. 30, no. 8, pp. 2634-2640, Jul. 1996.
 C-B Wang, and W-X Zhang, "Synthesizing Nanoscale Iron Particles for Rapid and Complete Dechlorination of TCE and PCBs," Journal of Environmental Science and Technology, vol. 31, no. 7, Jun. 1997.
 T. Satapanajaru, S.D. Comfort, and P.J. Shea, "Enhancing Metolachlor Destruction Rates with Aluminum and Iron Salts during Zerovalent Iron Treatment," Journal of Environmental Quality, vol. 32, pp. 1726-1734, Sep. 2002.
 M.J. Alowitz and M.M. Scherer, "Kinetics of Nitrate, Nitrite, and Cr(VI) Reduction by Iron Metal," Journal of Environmental Science and Technology, vol. 36, no. 3, pp. 299-306, Jan. 2002.
 Y.H. Huang, T.C. Zhang, P.J. Shea, and S.D. Comfort, "Effects of Oxide Coating and Selected Cations on Nitrate Reduction by Iron Metal Journal of Environmental Quality, vol. 32, pp. 1306-1315, 2003.
 T . Satapanajaru, P.J. Shea, and S . Cmfort, "Green Rust and Iron Oxide Formation Influences Metolachlor Dechlorination during Zerovalent Iron Treatment," Journal of Environmetal Science and Technology, vol. 37, pp. 5219-5227 , Oct. 2003.
 T. Dombek, E. Dolan, J. Schultz, and D. Klarup, "Rapid reductive dechlorination of atrazine by zero-valent iron under acidic conditions," Journal of Environmental Pollution, vol. 111, pp. 21-27, Dec. 1999.
 J. Farrell, M. Kason, N. Melitas, and T. Li, "Investigation of the Long- Term Performance of Zero-Valent Iron for Reductive Dechlorination of Trichloroethylene," Journal of Environmetal Science and Technology, vol. 34, no. 3, pp. 514-521, Dec. 1999.
 U. Schwertman and R.M. Cornell, Iron oxides in the laboratory, New York: VCH Publication, 1991.
 E.J. Reardon, "Anaerobic Corrosion of Granular Iron: Measurement and Interpretation of Hydrogen Evolution Rates," Journal of Environmental Science and Technology, vol. 29, pp. 2936-2945, Oct. 1995.
 B. Gu , T.J. Phelps, L. Liang, M.J. Dickey, Y. Roh, B.L. Kinsall, A.V. Palumbo, and G.K . Jacobs, "Biogeochemical Dynamics in Zero-Valent Iron Columns:Implications for Permeable Reactive Barriers," Journal of Environmental Science and Technology, vol. 33, pp. 2170-2177, Nov. 1999.