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Materials 2018, 11(8), 1347; https://doi.org/10.3390/ma11081347

Compact Storage of Radioactive Cesium in Compressed Pellets of Zeolite Polymer Composite Fibers

1
Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
2
Kasai Co., Ltd., 578-3 Kawaguchi Akiha-ku, Niigata 956-0015, Japan
3
Department of Chemistry and Biochemistry, National Institute of Technology, Fukushima College, Taira-kamiarakawa Nagao 30, Iwaki 970-8034, Japan
*
Author to whom correspondence should be addressed.
Received: 30 May 2018 / Revised: 27 July 2018 / Accepted: 30 July 2018 / Published: 3 August 2018
(This article belongs to the Special Issue Materials for Nuclear Waste Immobilization)
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Abstract

To facilitate the safe storage of radioactive Cs, a zeolite–poly(ethersulfone) composite fiber was fabricated to be a compact storage form of radioactive Cs, and an immobilization was investigated with respect to the effects of volume reduction and stability of the fiber’s adsorbent matrix. Using compressed heat treatment at 100–800 °C for a zeolite polymer composite fiber (ZPCF) containing Cs, the fabrication changed its form from a fiber into a pellet, which decreased the matrix volume to be about one-sixth of its original volume. The Cs leakage behavior of the ZPCF matrix was examined in its compact pellet form for non-radioactive Cs and radioactive Cs when different fabrication conditions were carried out in the immobilization. The elution ratio of non-radioactive Cs from the matrix was minimal, at 0.05%, when the ZPCF was compressed with heat treatment at 300 °C. When using radioactive Cs for the compression at below 300 °C, the pellet form also had no elution of the pollutants from the matrix. When the compressed treatment was at 500 °C, the matrix exhibited elution of radioactive Cs to the outside, meaning that the plastic component was burning and decomposed in the pellet. A comparison of ZPCF and natural zeolite indicated that the compressed heating process for ZPCF was useful in a less-volume-immobilized form of the compact adsorbent for radioactive Cs storage. View Full-Text
Keywords: cesium adsorbed; radioactive cesium; safe storage; zeolite polymer composite fiber cesium adsorbed; radioactive cesium; safe storage; zeolite polymer composite fiber
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Ooshiro, M.; Kobayashi, T.; Uchida, S. Compact Storage of Radioactive Cesium in Compressed Pellets of Zeolite Polymer Composite Fibers. Materials 2018, 11, 1347.

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