Radioactive iodine isotopes that are discharged into environment have been of significant concern due to its long-term impact on public health. In this work, a new bismuth-based composite named Bi@ESCNF (bismuth-decorated electrospinning carbon nanofibers) was prepared and investigated for capturing iodine-129 (¹²⁹I). This material used an electrospinning carbon nanofiber membrane as the substrate and metallic Bi nanoparticles were uniformly inlaid on the fibers, providing a rich active site to capture iodine gas. Due to the strong affinity of bismuth and iodine, Bi@ESCNF exhibited a very high iodine uptake capacity up to 559 mg/g after exposure to iodine for 4 h at 200 °C which could reach approximately two-fold higher than that of the commercial silver exchanged zeolite and even larger than other reported bismuth-based adsorbents. The uptake mechanism was also unraveled by the combined BET, PXRD, SEM, TEM, XPS, and Raman spectra characterizations. It is found that such excellent iodine capture property by this material was attributed to the chemical reaction between bismuth and iodine, which will generate a stable phase of BiI₃, and possess a huge specific surface area of 537 m²/g. Thus, our results showed that the new and highly efficient Bi@ESCNF would be a promising adsorbent for radioactive iodine removal.

由于其对公共卫生的长期影响，排入环境的放射性碘同位素已引起人们的极大关注。在这项工作中，制备了一种名为Bi @ ESCNF（铋修饰的电纺碳纳米纤维）的新型铋基复合材料，并对其进行了捕获碘129的研究（¹²⁹一世）。该材料使用静电纺丝碳纳米纤维膜作为基材，金属Bi纳米颗粒均匀地镶嵌在纤维上，提供了一个丰富的活性位点来捕获碘气。由于铋和碘具有很强的亲和力，Bi @ ESCNF在200°C的碘中暴露4 h后显示出非常高的碘吸收能力，高达559 mg / g，这可能是市售碘的两倍。银交换了沸石，甚至比其他报道的铋基吸附剂还大。BET，PXRD，SEM，TEM，XPS和拉曼光谱表征的组合也阐明了吸收机理。发现该材料的这种极好的碘捕获性能归因于铋和碘之间的化学反应，它将产生稳定的BiI ₃相。，并具有5​​37 m ² / g的巨大比表面积。因此，我们的结果表明，新型高效的Bi @ ESCNF将是一种有望去除放射性碘的吸附剂。