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Photoreduction of iron oxyhydroxides in the presence of important atmospheric organic compounds

Pehkonen, Simo O. and Siefert, Ron and Erel, Yigal and Webb, Sam and Hoffmann, Michael R. (1993) Photoreduction of iron oxyhydroxides in the presence of important atmospheric organic compounds. Environmental Science and Technology, 27 (10). pp. 2056-2062. ISSN 0013-936X.

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The photolytic reduction of amorphous iron hydroxide [am-Fe(OH)_3], lepidocrocite (γ-FeOOH), goethite (α-FeOOH), hematite (α-Fe_2O_3), and natural iron-containing aerosol particles in the presence of formaldehyde, formate, acetate, oxalate, and butyrate has been investigated. Important parameters in the photoreduction experiments are the pH, wavelength of the irradiating light, nature of the electron donor, characteristics of the iron phase. The present results show that the fastest rates of photoreduction of Fe(III) to Fe(II) are achieved with am-Fe(OH)_3 as the electron acceptor and formate as the electron donor. Maximum rates of photoreduction were observed at 330 nm with a continuous decrease to 405 nm. Natural iron-containing aerosol particles show photochemical behavior similar to am-Fe(OH)_3 and γ-FeOOH. These results suggest that a significant fraction of the reactive atmospheric iron in urban aerosol could be present as am-Fe- (OH)_3 and γ-FeOOH. Ambient iron-containing aerosol particles with oxalate as the electron donor resulted in a significant photochemical production of H_2O_2.

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Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 1993 American Chemical Society. Received for review November 5, 1992. Revised manuscript received May 25,1993. Accepted June 15, 1993. Publication Date: September 1993. The authors thank Mr. Michael Wong for his help in the photoreduction experiments and Prof. J. Morgan for helpful discussions. Support for this research has been provided by a grant from the National Science Foundation, Division of Atmospheric Sciences, Atmospheric Chemistry Section (ATM 9015775).
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NSFATM 9015775
Issue or Number:10
Record Number:CaltechAUTHORS:20150811-111819970
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Official Citation:Photoreduction of iron oxyhydroxides in the presence of important atmospheric organic compounds Simo O. Pehkonen, Ron Siefert, Yigal Erel, Sam Webb, and Michael R. Hoffmann Environmental Science & Technology 1993 27 (10), 2056-2062 DOI: 10.1021/es00047a010
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59402
Deposited By: Ruth Sustaita
Deposited On:12 Aug 2015 18:32
Last Modified:03 Mar 2020 13:01

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