fulltext.study @t Gmail

Photochemical reduction of U(VI) in aqueous solution in the presence of 2-propanol

Paper ID Volume ID Publish Year Pages File Format Full-Text
26756 43975 2014 8 PDF Available
Title
Photochemical reduction of U(VI) in aqueous solution in the presence of 2-propanol
Abstract

•UV–vis photochemical reduction of uranyl is revisited.•Mechanism depends on the presence of anions and irradiation conditions.•Role of nitrate as an intermediate in uranium reduction not previously reported.•Nitrate/short UV–vis light is the best system for U(VI) removal.

The efficiency of the photochemical reduction of uranyl (UO22+) (0.25 mM, pH 3) was analyzed in the absence and in the presence of 2-propanol (2-PrOH), evaluating the effect of anions (nitrate, acetate and perchlorate) and the use of quartz and glass photoreactors. A higher removal was observed under all conditions with the quartz photoreactor; the best system was that starting from uranyl nitrate, where a 90% UO22+ removal was attained after 15 min irradiation. In the absence of 2-PrOH, the acetate system was the only one where some U(VI) removal was observed (15% after 15 min in the quartz photoreactor) but, in the presence of the alcohol, the acetate system was the least reactive. Under irradiation, nitrate and acetate were consumed during the reaction, causing important effects on the uranyl conversion, while perchlorate was inactive. Uranium was removed from the system as a solid residue in the case of nitrate- (as U(IV)) and perchlorate-containing systems (as U(VI)), while it remained in solution in the case of the acetate systems. Mechanisms are proposed for the different conditions. The importance of nitrate as a reducing agent of uranium species has not been previously reported. The use of uranyl nitrate and short-near UV–vis light seems to be the most advisable way of removing uranyl from solutions, in the form of a stable precipitate.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Photochemical reduction; U(VI); U(IV); 2-Propanol
First Page Preview
Photochemical reduction of U(VI) in aqueous solution in the presence of 2-propanol
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 277, 1 March 2014, Pages 19–26
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us