Journal of Nanoparticle Research

, Volume 11, Issue 4, pp 807–819 | Cite as

Rapid and controlled transformation of nitrate in water and brine by stabilized iron nanoparticles

Research Paper

Abstract

Highly reactive zero-valent iron (ZVI) nanoparticles stabilized with carboxymethyl cellulose (CMC) were tested for reduction of nitrate in fresh water and brine. Batch kinetic tests showed that the pseudo first-order rate constant (kobs) with the stabilized nanoparticles was five times greater than that for non-stabilized counterparts. The stabilizer not only increased the specific surface area of the nanoparticles, but also increased the reactive particle surface. The allocation between the two reduction products, NH4+ and N2, can be manipulated by varying the ZVI-to-nitrate molar ratio and/or applying a Cu–Pd bimetallic catalyst. Greater CMC-to-ZVI ratios lead to faster nitrate reduction. Application of a 0.05 M HEPES buffer increased the kobs value by 15 times compared to that without pH control. Although the presence of 6% NaCl decreased kobs by 30%, 100% nitrate was transformed within 2 h in the saline water. The technology provides a powerful alternative for treating water with concentrated nitrate such as ion exchange brine.

Keywords

Denitrification Ion exchange brine Nanoparticles Nitrate Reduction Sodium carboxymethyl cellulose Zero-valent iron (ZVI) Water treatment 

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Environmental Engineering Program, Department of Civil Engineering, 238 Harbert Engineering CenterAuburn UniversityAuburnUSA
  2. 2.Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijingChina

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