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Title: Mössbauer study of metallic iron and iron oxide nanoparticles having environmental purifying ability

Abstract

A relationship between local structure and methylene blue (MB) decomposing ability of nanoparticles (NPs) of metallic iron (Fe{sup 0}) and maghemite (γ‐Fe{sub 2}O{sub 3}) was investigated by {sup 57}Fe Mössbauer spectroscopy, X-ray diffractometry and UV-visible light absorption spectroscopy. γ‐Fe{sub 2}O{sub 3} NPs were successfully prepared by mixing (NH{sub 4}){sub 2}Fe(SO{sub 4}){sub 2}⋅6H{sub 2}O (Mohr's salt) and (NH{sub 4}){sub 3}Fe(C{sub 2}O{sub 4}){sub 3}⋅3H{sub 2}O aqueous solution at 30 °C for 1 h, while those of Fe{sup 0} were obtained by the reduction of Mohr's salt with NaBH{sub 4}. From the Scherrer's equation, the smallest crystallite sizes of γ‐Fe{sub 2}O{sub 3} NPs and Fe{sup 0} NPs were determined to be 9.7 and 1.5 nm, respectively. {sup 57}Fe Mössbauer spectrum of γ‐Fe{sub 2}O{sub 3} NPs consists of a relaxed sextet with isomer shift (δ) of 0.33{sub ±0.01} mm s{sup −1}, internal magnetic field (H{sub int}) of 25.8{sub ±0.5} T, and linewidth (Γ) of 0.62{sub ±0.04} mm s{sup −1}. {sup 57}Fe Mössbauer spectrum of Fe{sup 0} NP is mainly composed of a sextet having δ, Δ, and H{sub int} of 0.00{sub ±0.01} mm s{sup −1} 0.45{sub ±0.01} mm s{sup −1}, and 22.8{sub ±0.1} T, respectively. A bleaching test of the mixture of Fe{sup 0}more » and γ‐Fe{sub 2}O{sub 3} NPs (3:7 ratio, 100 mg) in MB aqueous solution (20 mL) for 6 h showed a remarkable decrease of MB concentration with the first-order rate constant (k{sub MB}) of 6.7 × 10{sup −1} h{sup −1}. This value is larger than that obtained for the bleaching test using bulk Fe{sup 0}+γ‐Fe{sub 2}O{sub 3} (3:7) mixture (k{sub MB} = 6.5×10{sup −3}h{sup −1}). These results prove that MB decomposing ability is enhanced by the NPs mixture of Fe{sub 0} and γ‐Fe{sub 2}O{sub 3}.« less

Authors:
; ;  [1]; ;  [2]; ;  [3];  [4]
  1. Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachi-Oji, Tokyo 192-0397 (Japan)
  2. Division of Materials Chemistry, Ruđer Bošković Institute, P. O. Box 180, Zagreb 10002 (Croatia)
  3. Institute of Chemistry, Eötvös Loránd University, P.O. Box 32, 1512 Budapest (Hungary)
  4. Department of Biological and Environmental Chemistry, Faculty of Humanity-Oriented Science and Engineering, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555 (Japan)
Publication Date:
OSTI Identifier:
22308096
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1622; Journal Issue: 1; Conference: Conference on Moessbauer spectroscopy in materials science 2014, Hlohovec u Breclavi (Czech Republic), 26-30 May 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; AQUEOUS SOLUTIONS; CONCENTRATION RATIO; FERRITES; IRON 57; IRON OXIDES; ISOMER SHIFT; MAGNETIC FIELDS; METHYLENE BLUE; NANOPARTICLES; REDUCTION; SULFATES; ULTRAVIOLET RADIATION; VISIBLE RADIATION; X-RAY DIFFRACTION

Citation Formats

Kubuki, Shiro, Watanabe, Yuka, Akiyama, Kazuhiko, Ristić, Mira, Krehula, Stjepko, Homonnay, Zoltán, Kuzmann, Ernő, and Nishida, Tetsuaki. Mössbauer study of metallic iron and iron oxide nanoparticles having environmental purifying ability. United States: N. p., 2014. Web. doi:10.1063/1.4898622.
Kubuki, Shiro, Watanabe, Yuka, Akiyama, Kazuhiko, Ristić, Mira, Krehula, Stjepko, Homonnay, Zoltán, Kuzmann, Ernő, & Nishida, Tetsuaki. Mössbauer study of metallic iron and iron oxide nanoparticles having environmental purifying ability. United States. https://doi.org/10.1063/1.4898622
Kubuki, Shiro, Watanabe, Yuka, Akiyama, Kazuhiko, Ristić, Mira, Krehula, Stjepko, Homonnay, Zoltán, Kuzmann, Ernő, and Nishida, Tetsuaki. 2014. "Mössbauer study of metallic iron and iron oxide nanoparticles having environmental purifying ability". United States. https://doi.org/10.1063/1.4898622.
@article{osti_22308096,
title = {Mössbauer study of metallic iron and iron oxide nanoparticles having environmental purifying ability},
author = {Kubuki, Shiro and Watanabe, Yuka and Akiyama, Kazuhiko and Ristić, Mira and Krehula, Stjepko and Homonnay, Zoltán and Kuzmann, Ernő and Nishida, Tetsuaki},
abstractNote = {A relationship between local structure and methylene blue (MB) decomposing ability of nanoparticles (NPs) of metallic iron (Fe{sup 0}) and maghemite (γ‐Fe{sub 2}O{sub 3}) was investigated by {sup 57}Fe Mössbauer spectroscopy, X-ray diffractometry and UV-visible light absorption spectroscopy. γ‐Fe{sub 2}O{sub 3} NPs were successfully prepared by mixing (NH{sub 4}){sub 2}Fe(SO{sub 4}){sub 2}⋅6H{sub 2}O (Mohr's salt) and (NH{sub 4}){sub 3}Fe(C{sub 2}O{sub 4}){sub 3}⋅3H{sub 2}O aqueous solution at 30 °C for 1 h, while those of Fe{sup 0} were obtained by the reduction of Mohr's salt with NaBH{sub 4}. From the Scherrer's equation, the smallest crystallite sizes of γ‐Fe{sub 2}O{sub 3} NPs and Fe{sup 0} NPs were determined to be 9.7 and 1.5 nm, respectively. {sup 57}Fe Mössbauer spectrum of γ‐Fe{sub 2}O{sub 3} NPs consists of a relaxed sextet with isomer shift (δ) of 0.33{sub ±0.01} mm s{sup −1}, internal magnetic field (H{sub int}) of 25.8{sub ±0.5} T, and linewidth (Γ) of 0.62{sub ±0.04} mm s{sup −1}. {sup 57}Fe Mössbauer spectrum of Fe{sup 0} NP is mainly composed of a sextet having δ, Δ, and H{sub int} of 0.00{sub ±0.01} mm s{sup −1} 0.45{sub ±0.01} mm s{sup −1}, and 22.8{sub ±0.1} T, respectively. A bleaching test of the mixture of Fe{sup 0} and γ‐Fe{sub 2}O{sub 3} NPs (3:7 ratio, 100 mg) in MB aqueous solution (20 mL) for 6 h showed a remarkable decrease of MB concentration with the first-order rate constant (k{sub MB}) of 6.7 × 10{sup −1} h{sup −1}. This value is larger than that obtained for the bleaching test using bulk Fe{sup 0}+γ‐Fe{sub 2}O{sub 3} (3:7) mixture (k{sub MB} = 6.5×10{sup −3}h{sup −1}). These results prove that MB decomposing ability is enhanced by the NPs mixture of Fe{sub 0} and γ‐Fe{sub 2}O{sub 3}.},
doi = {10.1063/1.4898622},
url = {https://www.osti.gov/biblio/22308096}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1622,
place = {United States},
year = {Mon Oct 27 00:00:00 EDT 2014},
month = {Mon Oct 27 00:00:00 EDT 2014}
}