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Study on radiation-induced oxide-reduction of actinoid ions in acid solution

Abstract

Many studies have been made on the application of actinoid ion, especially UO{sub 2}{sup 2+} to change atomic valance but the mechanism of photoreduction has not yet been solved. In this study, the mechanism of photoreduction of UO{sub 2}{sup 2+} in acid solution was investigated. As functions of alcohol and acid concentrations, {phi}(U{sup IV}) was determined and photoreduction of UO{sub 2}{sup 2+} was investigated as well as NpO{sub 2}{sup 2+}. As an increase of alcohol content (EtOH, MtOH, iso-PrOH), {phi}(U{sup IV}) increased to reach a plateau ({approx}0.6). In addition, {phi}(U{sup IV}) increased linearly with an increase of acid content and the value became smaller in the order, H{sub 3}PO{sub 4}, H{sub 2}SO{sub 4}, HClO{sub 4} solution. Comparing with these results of UO{sub 2}{sup 2+}, photoreduction of NpO{sub 2}{sup 2+} was investigated. Only NpO{sub 2}{sup +} was produced as the final products, but not Np{sup IV} and NP{sup III}. Alcohol dependency of NpO{sub 2}{sup 2+} photoreduction was similar to that of UO{sub 2}{sup 2+} system but the plateau level of {phi} (NpO{sub 2}{sup 2+}) was lower ({approx}0.15) than the latter. (M.N.)
Authors:
Ishigure, Kenkichi; Katsumura, Yosuke; Hiroishi, Daisuke [1] 
  1. Tokyo Univ. (Japan). Faculty of Engineering; and others
Publication Date:
Jan 01, 1996
Product Type:
Technical Report
Report Number:
UTRCN-G-24
Reference Number:
SCA: 050800; 400201; 400500; PA: JPN-97:006287; EDB-97:115543; SN: 97001823178
Resource Relation:
Other Information: PBD: Jan 1996; Related Information: Is Part Of Report on progress of researches by common utilization of JAERI nuclear facilities, for fiscal 1994; PB: 373 p.
Subject:
05 NUCLEAR FUELS; 40 CHEMISTRY; ACTINIDES; CHEMICAL RADIATION EFFECTS; REDOX REACTIONS; WATER CHEMISTRY; REPROCESSING; URANIUM DIOXIDE; REACTION KINETICS; NEPTUNIUM; ALCOHOLS; ADDITIVES; SOLVENTS
OSTI ID:
520789
Research Organizations:
Tokyo Univ. (Japan). Research Center for Nuclear Science and Technology
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE97736276; TRN: JP9706287
Availability:
INIS; OSTI as DE97736276
Submitting Site:
JPN
Size:
pp. 292-294
Announcement Date:
Sep 23, 1997

Citation Formats

Ishigure, Kenkichi, Katsumura, Yosuke, and Hiroishi, Daisuke. Study on radiation-induced oxide-reduction of actinoid ions in acid solution. Japan: N. p., 1996. Web.
Ishigure, Kenkichi, Katsumura, Yosuke, & Hiroishi, Daisuke. Study on radiation-induced oxide-reduction of actinoid ions in acid solution. Japan.
Ishigure, Kenkichi, Katsumura, Yosuke, and Hiroishi, Daisuke. 1996. "Study on radiation-induced oxide-reduction of actinoid ions in acid solution." Japan.
@misc{etde_520789,
title = {Study on radiation-induced oxide-reduction of actinoid ions in acid solution}
author = {Ishigure, Kenkichi, Katsumura, Yosuke, and Hiroishi, Daisuke}
abstractNote = {Many studies have been made on the application of actinoid ion, especially UO{sub 2}{sup 2+} to change atomic valance but the mechanism of photoreduction has not yet been solved. In this study, the mechanism of photoreduction of UO{sub 2}{sup 2+} in acid solution was investigated. As functions of alcohol and acid concentrations, {phi}(U{sup IV}) was determined and photoreduction of UO{sub 2}{sup 2+} was investigated as well as NpO{sub 2}{sup 2+}. As an increase of alcohol content (EtOH, MtOH, iso-PrOH), {phi}(U{sup IV}) increased to reach a plateau ({approx}0.6). In addition, {phi}(U{sup IV}) increased linearly with an increase of acid content and the value became smaller in the order, H{sub 3}PO{sub 4}, H{sub 2}SO{sub 4}, HClO{sub 4} solution. Comparing with these results of UO{sub 2}{sup 2+}, photoreduction of NpO{sub 2}{sup 2+} was investigated. Only NpO{sub 2}{sup +} was produced as the final products, but not Np{sup IV} and NP{sup III}. Alcohol dependency of NpO{sub 2}{sup 2+} photoreduction was similar to that of UO{sub 2}{sup 2+} system but the plateau level of {phi} (NpO{sub 2}{sup 2+}) was lower ({approx}0.15) than the latter. (M.N.)}
place = {Japan}
year = {1996}
month = {Jan}
}