Issue 1, 2019, Issue in Progress

The regeneration of Fe-EDTA denitration solutions by nanoscale zero-valent iron

Abstract

Fe(II) ethylenediaminetetraacetate (EDTA) chelate solution is generally considered to be an effective nitric oxide (NO) absorbent. However, since the ferrous active site is occupied by nitric oxide and the ferrous chelate is oxidized to ferric chelate by oxygen in air, its absorption capacity will gradually decrease with the NO absorption process. Here, we propose a method for regenerating the NO-attenuated Fe(II)EDTA solution by adding nanoscale zero-valent iron (NZVI) under three different pH conditions. Furthermore, compared with the commercially available iron powder, NZVI was also found to be effective not only for the regeneration of expired Fe-EDTA solution but also for the reduction of Fe(III) EDTA solution. According to the results obtained herein, different acidity levels of solution, from weakly acidic to near neutral, are all suitable for the regeneration–absorption process.

Graphical abstract: The regeneration of Fe-EDTA denitration solutions by nanoscale zero-valent iron

Article information

Article type
Paper
Submitted
30 Oct 2018
Accepted
09 Dec 2018
First published
21 Dec 2018
This article is Open Access
Creative Commons BY license

RSC Adv., 2019,9, 132-138

The regeneration of Fe-EDTA denitration solutions by nanoscale zero-valent iron

W. Jiang, X. Wang, Q. Xu, J. Xiao and X. Wei, RSC Adv., 2019, 9, 132 DOI: 10.1039/C8RA08992B

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements