NDLI: A facile method for determining the Fe(0) content and reactivity of zero valent iron

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A facile method for determining the Fe(0) content and reactivity of zero valent iron

Content Provider	Royal Society of Chemistry (RSC)
Author	Wang, Wei Lei, Hong Li, Shaolin Ding, Yangyang
Copyright Year	2016
Abstract	Zero valent iron (ZVI) is increasingly used in large quantities for water treatment. In large-scale application of ZVI, a common question that engineers encounter is ZVI selection or its quality assurance and quality control (QA/QC). A facile method for assessing ZVI quality is proposed and studied in this work. The method is based on the Fe(III)–Fe(0) reaction that has a fast reaction rate, a known and simple stoichiometry, and an easy-to-assay product. The method is conducted by mixing the sample (e.g., testing ZVI) with concentrated Fe(III) solution (up to 3.0 g L−1) for 3–4 hours. The metallic iron (Fe(0)) content of the sample is obtained by assaying the final increase of the total dissolved iron, and its reactivity is quantified using the observed dissolution rate constants. The method is experimentally validated using 23 iron-based materials. Studies with reference iron powder and iron oxide demonstrate that the Fe(III) solution has satisfactory specificity in selecting Fe(0). Replicate experiments and t-test evaluation show the complete dissolution of the Fe(0) content in micron-scale ZVI and the high reproducibility of the method for measuring Fe(0). The accuracy and reliability of the method are studied using 15 commercial ZVIs of known Fe(0) purity, in a series of experiments using Fe(III), Cu(II) or trichloroethylene. The experiments show that the results from the proposed method are accurate and reliable, and that the method is a strong tool more effective than conventional techniques such as X-ray diffraction and BET-N2 adsorption. This work provides an easy and facile way for the quantitative assessment of the quality of metallic iron used for environmental clean-up, especially for the quick survey of a large number of iron samples on site. The method may also serve as a QA/QC procedure for ZVI in industrial-scale production.
Starting Page	1239
Ending Page	1248
Page Count	10
File Format	HTM / HTML PDF
ISSN	17599660
Volume Number	8
Issue Number	6
Journal	Analytical Methods
DOI	10.1039/c5ay02182k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography Queen's Counsel Stoichiometry Iron oxide Adsorption Trichloroethylene Reaction rate
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry Engineering Chemical Engineering

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A facile method for determining the Fe(0) content and reactivity of zero valent iron

Influence of mixed-surfactant on reductive dechlorination of trichloroethylene by zero-valent iron

Trichloroethylene dechlorination by copper-contained zero-valent iron slurry

Effect of reduction temperature on the preparation of zero-valent iron aerogels for trichloroethylene dechlorination

Removal of Trichloroethylene from Water by Bimetallic Ni/Fe Nanoparticles

Effect of the structural change of an iron–iron oxide mixture on the decomposition of trichloroethylene

DEGRADATION OF DDT , ENDRIN , AND ENDOSULFAN IN POLLUTED-SOILS BY ZERO-VALENT IRON ( Fe 0 ) AND ZERO-VALENT IRON-COPPER ( Fe 0-Cu 0 )

Dechlorination of trichloroethylene in solution over supported nano zero valent Fe and Cu/Fe bimetal on exfoliated graphite

Effect of Surfactants on Zero-Valent Iron Nanoparticles (NZVI) Reactivity

A facile method for determining the Fe(0) content and reactivity of zero valent iron

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