Sulfur vacancy-rich bismuth sulfide nanowire derived from CAU-17 for radioactive iodine capture in complex environments: Performance and intrinsic mechanisms

作者：Kai-Wei Chen, Xinyu Zhou, Xiaojun Dai, Yi‐Ting Chen, Shuxuan Li, Chunhui Gong, Peng Wang, Ping Mao, Yan Jiao, Kai Chen, Yi Yang · 发表于：Journal of Hazardous Materials · 年份：2024 · DOI：10.1016/j.jhazmat.2024.134584 · 被引用次数：33 · 研究领域：Covalent Organic Framework Applications、Gas Sensing Nanomaterials and Sensors、Metal-Organic Frameworks: Synthesis and Applications

Effective capture and immobilization of volatile radioiodine from the off-gas of post-treatment plants is crucial for nuclear safety and public health, considering its long half-life, high toxicity, and environmental mobility. Herein, sulfur vacancy-rich Vs-Bi 2 S 3 @C nanocomposites were systematically synthesized via a one-step solvothermal vulcanization of CAU-17 precursor. Batch adsorption experiments demonstrated that the as-synthesized materials exhibited superior iodine adsorption capacity (1505.8 mg g −1 at 200 °C), fast equilibrium time (60 min), and high chemisorption ratio (91.7%), which might benefit from the nanowire structure and abundant sulfur vacancies of Bi 2 S 3 . Furthermore, Vs-Bi 2 S 3 @C composites exhibited excellent iodine capture performance in complex environments (high temperatures, high humidity and radiation exposure). Mechanistic investigations revealed that the I 2 capture by fabricated materials primarily involved the chemical adsorption between Bi 2 S 3 and I 2 to form BiI 3 , and the interaction of I 2 with electrons provided by sulfur vacancies to form polyiodide anions (I 3 - ). The post-adsorbed iodine samples were successfully immobilized into commercial glass fractions in a stable form (Bi x O y I), exhibiting a normalized iodine leaching rate of 3.81 × 10 −5 g m −2 d −1 . Overall, our work offers a novel strategy for the design of adsorbent materials tailed for efficient capture and immobilization of volatile radioiodine.