Tritium separation from parts-per-trillion-level water by a membrane with protonated manganese dioxide
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This study shows a membrane containing a protonated manganese dioxide powder that is able to continually extract tritium from light water at room temperature. The method of using membrane-supplied protons through a proton conductive polymer film from acidic aqueous solution was remarkably effective at maintaining a continual extraction of tritium from light water, compared to the use of the protonated manganese dioxide powder alone. The extraction mechanism of tritium might be based on the prior oxidation of OT− at the interface of protonated manganese dioxide and water via neutralization between H+/T+ and OH−/OT−.
KeywordsTritium Separation Extraction Protonated manganese dioxide Membrane
The authors thank Y. Koyanaka for advices on LiMn2O4 preparation, A. I. Kolesnikov for discussions about INS data, H. Miyatake for advices on LSC measurements, M. Tsujimoto for performing XANES measurements, and Oita Industrial Research Institute for assistance to take digital microscopic images. Y. Isozumi and M. Tosaki for acceptances of executing the experiments at Kyoto University. This work was financially supported by FORWARD SCIENCE LABORATORY LTD., partly supported by the Radioisotope Research Center of Kyoto University, the KAKENHI (Grant No. 21560800), and the WPI program operated by the Ministry of Education, Culture, Sports, Science and Technology of Japan.
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