High Retention Immobilization of Iodine in B–Bi–Zn Oxide Glass Using Bi₂O₃ as a Stabilizer under a N₂ Atmosphere

Abstract

The immobilization of iodine waste suffers from serious iodine loss during heat treatment. Herein, we reported on the high iodine retention immobilization of simulated radioiodinecontaminated Bi 0 −SiO 2 sorbent in B−Bi−Zn oxide glass using Bi 2 O 3 as a stabilizer under a N 2 atmosphere. The effects of the Bi 2 O 3 content and sintering atmosphere on the iodine immobilization behaviors (iodine retention ratio, phase composition, microstructure, and chemical stability) were investigated. It was found that the decomposition of BiI 3 was prevented by adding Bi 2 O 3 and sintering in a N 2 atmosphere. The iodine retention ratio in the obtained glass waste form was significantly enhanced with increasing Bi 2 O 3 content and sintering in the N 2 atmosphere due to the synergistic effect. The achieved record-high iodine retention (92.22 ± 2.6%) was much higher than that of conventional heat treatment route (18.01 ± 3.5%). The results demonstrated that iodine was effectively immobilized through the formation of stable Bi x O y I (Bi 5 O 7 I and BiOI). Furthermore, the obtained iodine waste form exhibited excellent compactness and chemical stability. Owing to its high iodine retention ratio, this route can be employed to effectively immobilize radioactive iodine.

Bi0–Reduced Graphene Oxide Composites for the Enhanced Capture and Cold Immobilization of Off-Gas Radioactive Iodine

“…Taylor and Lopata studied the hydrolytic stability of bismuth iodine compounds under various conditions and concluded that bismuth oxyiodides, such as Bi 5 O 7 I and BiOI, were excellent candidate waste forms for 129 I immobilization owing to their high chemical stability and low solubility in aqueous media. However, BiI 3 is not a suitable waste form for long-term storage and disposal because of its high susceptibility to hydrolysis and low thermal resistance. – …”

Hollow Core–Shell Bismuth Based Al‐Doped Silica Materials for Powerful Co‐Sequestration of Radioactive I2 and CH3I

“…Recent focus has converged on bismuth-based functional materials (BBMs) due to their significant advantages such as relatively high I 2 sorption capacity and low production costs. [26][27][28][29][30][31][32][33][34] Since Yang and coworkers reported the first BBM for efficient capture of radioactive iodine in 2015, [58,59] researchers have conducted a large amount of work in this field. However, there are still several issues regarding such materials that need to be addressed.…”