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Surface decontamination by photocatalysis

Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSNConference contribution/Paperpeer-review

Published
Publication date15/10/2009
Host publicationASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM 2009
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages185-193
Number of pages9
Volume2
ISBN (print)9780791844083
<mark>Original language</mark>English
EventASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM 2009 - Liverpool, United Kingdom
Duration: 11/10/200915/10/2009

Conference

ConferenceASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM 2009
Country/TerritoryUnited Kingdom
CityLiverpool
Period11/10/0915/10/09

Publication series

NameProceedings of the International Conference on Radioactive Waste Management and Environmental Remediation, ICEM
Volume2

Conference

ConferenceASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM 2009
Country/TerritoryUnited Kingdom
CityLiverpool
Period11/10/0915/10/09

Abstract

Currently in the nuclear industry, surface contamination in the form of radioactive metal or metal oxide deposits is most commonly removed by chemical decontamination, electrochemical decontamination or physical attrition. Physical attrition techniques are generally used on structural materials (concrete, plaster), with (electro)chemical methods being used to decontaminate metallic or painted surfaces. The most common types of (electro)chemical decontamination are the use of simple mineral acids such as nitric acid or cerium (IV) oxidation (MEDOC). Use of both of these reagents frequently results in the dissolution of a layer of the substrate surface increasing the percentage of secondary waste which leads to burdens on downstream effluent treatment and waste management plants. In this context, both mineral acids and MEDOC can be indiscriminate in the surfaces attacked during deployment, e.g. attacking in transit through a pipe system to the site of contamination resulting in both diminished effect of the decontaminating reagent upon arrival at its target site and an increased secondary waste management requirement. This provides two main requirements for a more ideal decontamination reagent: Improved area specificity and a dissolution power equal to or greater than the previously mentioned current decontaminants. Photochemically promoted processes may provide such a decontamination technique. Photochemical reduction of metal ion valence states to aid in heavy metal deposition has already been extensively studied [1], with reductive manipulation also being achieved with uranium and plutonium simulants (Ce) [2]. Importantly photooxidation of a variety of metals, including neptunium [3], has also been achieved. Here we report on the potential application of this technology to metal dissolution.