Investigations into Plasma-Mediated Decomposition of Organoiodide Species as a Pretreatment for Mitigation of Radioiodine Emissions

Balumuru, Chaithanya; Stanford, John; Raja, Krishnan; Sabharwall, Piyush; Utgikar, Vivek

doi:10.1021/acs.iecr.1c04049

Title: Investigations into Plasma-Mediated Decomposition of Organoiodide Species as a Pretreatment for Mitigation of Radioiodine Emissions

Journal Article · 02 January 2022 · Industrial and Engineering Chemistry Research

DOI: https://doi.org/10.1021/acs.iecr.1c04049 · OSTI ID:1923544

Balumuru, Chaithanya ^[1]; Stanford, John ^[1]; Raja, Krishnan ^[1];

^[2];

^[1]

Univ. of Idaho, Moscow, ID (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States)

A plasma-mediated pretreatment step is proposed to decompose methyl iodide (CH₃I) for facilitating the capture of the iodine radioisotopes present in off-gas streams from used nuclear fuel reprocessing operations. Simulated CH₃I gas streams were exposed to dielectric barrier discharge (DBD) plasma in a quartz glass continuous-flow reactor using copper electrodes. The kinetics of decomposition of CH₃I in nitrogen was investigated by varying the applied voltage, inlet concentration, and residence time. The rate of decomposition was proportional to CH₃I concentration and increased as the applied potential was increased. This effect was incorporated in the kinetics through the dependence of the rate constant on the applied electric field. Decomposition of CH₃I was not affected by moisture, and the DBD pretreatment is likely to be similarly effective in an air environment as well; however, the results were confounded by a plasma-mediated reaction between nitrogen and oxygen.

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Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC07-05ID14517; NE0008778

OSTI ID:: 1923544

Report Number(s):: INL/JOU-23-70741-Rev000

Journal Information:: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 1 Vol. 61; ISSN 0888-5885

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
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Title: Investigations into Plasma-Mediated Decomposition of Organoiodide Species as a Pretreatment for Mitigation of Radioiodine Emissions

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