Electrochemically triggered iodide-vacancy BiOI film for selective extraction of iodide ion from aqueous solutions
Electrochemically triggered iodide-vacancy BiOI film for selective extraction of iodide ion from aqueous solutions
复制标题
电化学触发碘空位 BiOI 膜用于从水溶液中选择性萃取碘离子
DOI：
10.1016/j.seppur.2020.118120
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发表时间：
2021
影响因子：
8.6
通讯作者：
Li Jun
中科院分区：
文献类型：
--
作者：
Luo Jinhua;Du Xiao;Gao Fengfeng;Ma Pengfei;Hao Xiaogang;Guan Guoqing;Scialdone Onofrio;Li Jun
放射性碘的有效提取和再生仍然是安全利用核能的一个紧迫问题。为此，我们研制了一种新型的电化学触发碘-空位BiOI膜，该膜表现出良好的I-−离子萃取能力，达到328.3 mg·g−-1。特别是由于离子空位陷阱效应，在存在大量竞争阴离子的情况下，该膜对I-−离子表现出高的选择性。此外，该膜的电化学开关离子萃取(ESIE)过程具有较快的萃取动力学和较高的稳定性。更重要的是，在电分离过程中，被捕获的I-−离子可以很容易地从薄膜中解吸出来，而不会产生二次污染，同时，碘-空位BiOI薄膜能够完全再生。这种含碘空位的膜有望成为从放射性水中选择性提取I-−离子的一种有前途的工艺。
The effective extraction and regeneration of radioactive iodide remains an urgent concern for safe nuclear energy utilization. Herein, we developed a novel electrochemically triggered iodide-vacancy BiOI film, which exhibited excellent I−ion extraction capacity of 328.3 mg·g−1. Especially, due to the ion vacancy trap effect, the film showed high selectivity towards I−ions in the existence of a large number of competitive anions. Additionally, the electrochemically switched ion extraction (ESIE) process with this iodide-vacancy BiOI film possessed fast extraction kinetics and high stability. More importantly, the trapped I−ions were easily desorbed from the film without the secondary pollution during the ESIE process and meanwhile, the iodide-vacancy BiOI film was able to be completely regenerated. It is expected that such an iodide-vacancy BiOI film with ESIE could become a promising process for the selective extraction of I−ions from the radioactive water.