A new method to produce nanoscale iron for nitrate removal
First Online: 12 March 2005 Received: 10 August 2004 Accepted: 23 November 2004 DOI:
Cite this article as: Chen, SS., Hsu, HD. & Li, CW. J Nanopart Res (2004) 6: 639. doi:10.1007/s11051-004-6672-2 Abstract
This article proposes a novel technology combining electrochemical and ultrasonic methods to produce nanoscale zero valent iron (NZVI). With platinum placed in the cathode and the presence of the dispersion agent, 0.2g/l cetylpyridinium chloride (CPC), a cation surfactant, in the solution, the nanoscale iron particle was successfully produced with diameter of 1–20 nm and specific surface area of 25.4m
2/g. The produced NZVI was tested in batch experiments for nitrate removal. The results showed that the nitrate reduction was affected by pH. Al low pH, nitrate was shown faster decline and more reduction in term of g NO –N/g NZVI. The reaction was first order and kinetic coefficients for the four pHs were directly related to pH with R 3 − 2 >0.95. Comparing with microscale zero-valent iron (45μm, 0.183m 2/g), microscale zero-valent iron converted nitrate to ammonia completely, but NZVI converted nitrate to ammonia partially from 36.2 to 45.3% dependent on pH. For mass balance of iron species, since the dissolved iron in the solution was very low (<1mg/l), Electron Spectroscopy for Chemical Analysis (ESCA) was used for identification of oxidation state of the surface species on the NZVI and Fe 2O 3 was recognized. Thus the reaction mechanisms can be determined.
Keywords zero-valent iron nanoscale nitrate stabilizer ESCA first-order reaction electroplating References Agrawal, A., Tratnyek, P.G. 1996 Reduction of nitro aromatic compounds by zero-valent iron metal Envir. Sci. Tech. 30 153 160 Google Scholar Cheng, I.F., Muftikian, R., Fernando, Q., Korte, N. 1997 Reduction of nitrate to ammonia by zero-valent iron Chemosphere 35 2689 2695 Google Scholar Chew, C.F., Zhang, T.C. 1998 In-situ remediation of nitrate-contaminated ground water by electrokinetics/iron wall processes Water Sci. Technol. 38 135 142 Google Scholar
Chew C.F., T.C. Zhang & J. Shan, 1998. Removal of nitrate/atrazine contamination with zero-valent iron-promoted processes. In: Proceedings of the 1998 Conference on Hazardous Waste Research. Utah.
Choe, S., Chang, Y.-Y., Hwang, K.-Y., Khim, J. 2000 Kinetics of reductive denitrification by nanoscale zero-valent iron Chemosphere 41 1307 1311 Google Scholar Huang, C.-P, Wang, H.-W, Chiu, P.-C 1998 Nitrate reduction by metallic iron Water Res. 32 2257 2264 Google Scholar Huang, Y.H., Zhang, T.C. 2002 Kinetics of nitrate reduction by iron at near neutral pH J. Environ. Eng. 128 604 611 Google Scholar Huang, Y.H., Zhang, T.C. 2004 Effects of low pH on nitrate reduction by iron powder Water Res. 38 2631 2642 Google Scholar Huang, Y.H., Zhang, T.C., Shea, P.J., Comfort, S.D. 2003 Effects of oxide coating and selected cations on nitrate reduction by iron metal J. Environ. Qual. 32 1306 1315 Google Scholar Lien, H.-L., Zhang, W.-X. 1999 Transformation of chlorinated methanes by nanoscale iron particles J. Environ. Engin. 125 1042 1047 Google Scholar Lien, H.-L., Zhang, W.-X. 2001 Nanoscale iron particles for complete reduction of chlorinated ethenes Colloids Surf. A: Physicochem. Eng. Aspects 191 97 105 Google Scholar Montgomery, J.M. 1985Water Treatment Principles and Design John Wiley and Sons New York Google Scholar
Moulder J.F., W.F. Stickle, P.E. Sobol & K.D. Bomben, 1995. Handbook of X-Ray Photoelectron Spectroscopy: A Reference Book of Standard Spectra for Identification and Interpretation of XPS Data. Physical Electronics. Chanhassen, Mn.
Ponder, S.M., Mallouk, T.E., Darab, J.G. 2000 Remediation of Cr(VI) and Pb(II) aqueous solutions using supported, nanoscale zero-valent iron 34 34 2564 2569 Google Scholar Sawyer, C.N., McCarty, P.L., Parkin, G.F. 203Chemistry for Environmental Engineering5 McGraw-Hill Inc. New York Google Scholar Siantar, D.P., Schreier, C.G., Reinhard, M. , Chou, C.-S. 1996 Treatment of 1,2-dibromo-3-chloropropane and nitrate-contaminated water with zero-valent iron or hydrogen/palladium catalysts Water Res. 30 2315 2322 Google Scholar Standard Methods for the Examination of Water and Wastewater 1998American Public Health Association, American Water Work Association and Water Environment Federation20 Washington DC Google Scholar Tekaia-Elhsissen, K., Bonet, F., Silvert, P.-Y., Herrera-Urbina, R. 1999 Finely divided platinum-gold alloy powders prepared in ethylene glycol J. Alloys Comp. 292 96 99 Google Scholar Wang, C.-B., Zhang, W.-X. 1997 Synthesizing nanoscale iron particles for rapid and complete dechlorination of TCE and PCBs Environ. Sci. Technol. 31 2154 2156 Google Scholar Westerhoff, P. 2003 Reduction of nitrate, bromate, and chlorate by zero valent iron (Fe0) J. Environ. Eng. 129 10 16 Google Scholar Wilcoxon, J.P., Provencio, P.P. 1999 Use of Surfactant Micelles to Control the Structural Phase of Nanosize Iron Clusters J. Phys. Chem. B 103 9809 9812 Google Scholar Zawaideh, L.L., Zhang, T.C. 1998 The effects of pH and addition of an organic buffer (HEPES) on nitrate transformation in Fe0-water systems Water Sci. Technol. 38 107 115 Google Scholar Zhang, W.X. 2003 Nanoscale iron particles for environmental remediation: An Overview J. Nanoparticle Res. 5 323 332 Google Scholar