Nano Archive

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

Xiong, Zhong and Zhao, Dongye and Pan, Gang (2009) Rapid and controlled transformation of nitrate in water and brine by stabilized iron nanoparticles. Journal of Nanoparticle Research, 11 (4). pp. 807-819.

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Official URL: http://www.springerlink.com/content/5r7rl622776235...

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 (k obs) 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 k obs value by 15 times compared to that without pH control. Although the presence of 6% NaCl decreased k obs 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.

Item Type:Article
ID Code:4536
Deposited By:Prof. Alexey Ivanov
Deposited On:08 May 2009 09:48
Last Modified:08 May 2009 09:53

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