Efficient capture and stable storage of radioactive iodine by bismuth-based ZIF-8 derived carbon materials as adsorbents

• Published in: Separation and purification technology 2022-12, Vol.302, p.122151, Article 122151
• Main Authors: Liu, Sheng, Zeng, Yiyang, Liu, Jun, Li, Jiamao, Peng, Hao, Xie, Hui, Zou, Hao, Xiao, Chengjian, Hua, Xiaohui, Bao, Jingliang, Xian, Liang, Li, Yuanli, Chi, Fangting
• Format: Article
• Language: English
• Subjects: Adsorption; Immobilization; Iodine-129; Radioactive waste
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2022.122151

[Display omitted] •Bi@MVF prepared by impregnation reduction method on porous carbon substrate has abundant active sites.•Bi@MVF allows efficient iodine adsorption capacity, which is better than most benchmark iodine adsorbents.•The adsorption mechanism of iodine is mainly between the abundant Bi active sites in Bi@MVF and the chemical reaction of iodine to form a stable phase BiI3.•By using a simple post-treatment process for I-Bi@MVF, a more corrosion-resistant iodine binding phase Bi5O7I was obtained. The capturing and storage of iodine from nuclear waste through secure and advantageous techniques are significant. In this work, a novel bismuth-based porous carbon material referred to as Bi@MVF is elaborately synthesized employing a dipping-reduction technique to seize iodine-129 (129I), in which bismuth particles are uniformly embedded and allotted on the porous carbon network as multiple active sites. Accordingly, Bi@MVF lets in a highly-efficient iodine absorption potential of up to 1560 mg/g after publicity to iodine at 120 ℃ for 4 h, superior to most standard iodine adsorbents. The excessive adsorption kinetics of these Bi@MVF adsorbents is typically attributed to the specific porous carbon substrates' full-size particular surface area and the adsorbent’s synergistic effect. An in-depth perception of the iodine adsorption mechanism exhibits that the chemical adsorption turns into a powerful mechanism via the reaction between bismuth and iodine to structure a steady section BiI3. Moreover, an easy post-treatment system for these Bi@MVF adsorbents is adopted to gain the greater corrosion-resistant iodine-binding segment Bi5O7I, attaining a nominal iodine leaching rate. Therefore, the designed Bi@MVF will be a tremendous 129I stabilizer, and we will contribute a new approach for customizing new iodine adsorbents with excessive adsorption doses.