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Title: Zero Valent Iron: Impact of Anions Present during Synthesis on Subsequent Nanoparticle Reactivity

Abstract

Zero-valent iron particles are an effective remediation technology for groundwater contaminated with halogenated organic compounds. In particular, nano-scale zero-valent iron is a promising material for remediation due to its high specific surface area, which results in faster rate constants and more effective use of the iron. An aspect of iron nanoparticle reactivity that has not been explored is the impact of anions present during iron metal nanoparticle synthesis. Solutions containing chloride, phosphate, sulfate, and nitrate anions and ferric ions were used to generate iron oxide nanoparticles. The resulting materials were dialyzed to remove dissolved byproducts and then dried and reduced by hydrogen gas at high temperature. The reactivity of the resulting zero valent iron nanoparticles was quantified by monitoring the kinetics as well as products of carbon tetrachloride reduction, and significant differences in reactivity and chloroform yield were observed. The reactivity of nanoparticles prepared in the presence of sulfate and phosphate demonstrated the highest reactivity and chloroform yield. Furthermore, substantial variations in the solid-state products of oxidation (magnetite, iron sulfide, and goethite, among others) were also observed.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1030465
Report Number(s):
PNNL-SA-75864
2573; 2573a; 2573b; KP1704020; TRN: US201124%%226
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Environmental Engineering (ASCE), 137(10):889-896
Additional Journal Information:
Journal Volume: 137; Journal Issue: 10
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; ANIONS; CARBON TETRACHLORIDE; CHLOROFORM; GOETHITE; HYDROGEN; IRON; IRON OXIDES; IRON SULFIDES; KINETICS; MAGNETITE; MONITORING; NITRATES; ORGANIC COMPOUNDS; OXIDATION; PHOSPHATES; SPECIFIC SURFACE AREA; SULFATES; SYNTHESIS; Environmental Molecular Sciences Laboratory

Citation Formats

Moore, Kirsten, Forsberg, Brady, Baer, Donald R., Arnold, William A., and Penn, R. Lee. Zero Valent Iron: Impact of Anions Present during Synthesis on Subsequent Nanoparticle Reactivity. United States: N. p., 2011. Web. doi:10.1061/(ASCE)EE.1943-7870.0000407.
Moore, Kirsten, Forsberg, Brady, Baer, Donald R., Arnold, William A., & Penn, R. Lee. Zero Valent Iron: Impact of Anions Present during Synthesis on Subsequent Nanoparticle Reactivity. United States. doi:10.1061/(ASCE)EE.1943-7870.0000407.
Moore, Kirsten, Forsberg, Brady, Baer, Donald R., Arnold, William A., and Penn, R. Lee. Sat . "Zero Valent Iron: Impact of Anions Present during Synthesis on Subsequent Nanoparticle Reactivity". United States. doi:10.1061/(ASCE)EE.1943-7870.0000407.
@article{osti_1030465,
title = {Zero Valent Iron: Impact of Anions Present during Synthesis on Subsequent Nanoparticle Reactivity},
author = {Moore, Kirsten and Forsberg, Brady and Baer, Donald R. and Arnold, William A. and Penn, R. Lee},
abstractNote = {Zero-valent iron particles are an effective remediation technology for groundwater contaminated with halogenated organic compounds. In particular, nano-scale zero-valent iron is a promising material for remediation due to its high specific surface area, which results in faster rate constants and more effective use of the iron. An aspect of iron nanoparticle reactivity that has not been explored is the impact of anions present during iron metal nanoparticle synthesis. Solutions containing chloride, phosphate, sulfate, and nitrate anions and ferric ions were used to generate iron oxide nanoparticles. The resulting materials were dialyzed to remove dissolved byproducts and then dried and reduced by hydrogen gas at high temperature. The reactivity of the resulting zero valent iron nanoparticles was quantified by monitoring the kinetics as well as products of carbon tetrachloride reduction, and significant differences in reactivity and chloroform yield were observed. The reactivity of nanoparticles prepared in the presence of sulfate and phosphate demonstrated the highest reactivity and chloroform yield. Furthermore, substantial variations in the solid-state products of oxidation (magnetite, iron sulfide, and goethite, among others) were also observed.},
doi = {10.1061/(ASCE)EE.1943-7870.0000407},
journal = {Journal of Environmental Engineering (ASCE), 137(10):889-896},
number = 10,
volume = 137,
place = {United States},
year = {2011},
month = {10}
}