Bi2O3 doped B2O3-ZnO glass powder for immobilization of radioactive iodine waste at low temperature. (October 2021)

• Record Type: Journal Article
• Authors: Yan, Meng; Wu, Biao; Luo, Fen; Shu, Xiaoyan; Liu, Yi; Wei, Guilin; Zhang, Zhentao; Xie, Yi; Wang, Lan; Lu, Xirui
• Is Part Of: Annals of nuclear energy. Volume 161(2021)
• Publication Date: 2021-10
• Subjects: Pure glass-powder -- Iodine waste -- Low-temperature -- Stability -- Physical property; Nuclear energy -- Periodicals; Nuclear engineering -- Periodicals; 621.4805
• DOI: 10.1016/j.anucene.2021.108480
• Languages: English
• ISSNs: 0306-4549

Abstract

Graphical abstract: Highlights: Bi2 O3 with 0.10 mol % contents doped into B2 O3 -ZnO (99:1) to manufacture the glass powder at 550 °C. TGA illustrates that the AgI is well retained in the samples at 450 °C. The whole immobilized route is simple by glass-powder without considering the complex phase changing. The leaking rate of iodine is 1.89–3.40 × 10 −5 g∙m −2 ∙d −1 for 7 days, which shows considerable chemical durability. Abstract: In order to research the effect of Bi2 O3 doped B2 O3 -ZnO matrix in immobilizing iodine waste, different Bi2 O3 contents were doped into B2 O3 -ZnO glass to immobilize iodine loaded silver-coated silica-gel (AgIs). Bi2 O3 content doped B2 O3 -ZnO (99:1) as raw materials held the good physical and chemical property (Vickers hardness 3.07 GPa), so, the pure glass matrix was manufactured at 550 °C. SEM-EDS results gave that element I distributed homogeneously in the samples with 5 wt% AgIs at 450 °C. Meanwhile, the glass powder immobilized AgIs samples gave the glass–ceramic phases according to the XRD results, and the hightest density and Vickers hardness were 1.78 g/cm 3 and 0.30 GPa, respectively. The leaking rate of iodine was 1.89–3.40 × 10 −5 g∙m −2 ∙d −1 for 7 days, which was low and supports the stability of the immobilized AgIs with glass materials. This work highlights the well immobilized effect of Bi2 O3 doped B2 O3 -ZnO glass as raw material to immobilize iodine waste at low temperature.