期刊
APPLIED SURFACE SCIENCE
卷 646, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2023.158917
关键词
Pyrazole functionalization; Collagen fiber; Iodine vapor; Specific capture; Gaseous effluents
This study successfully prepared a pyrazole-directed functionalized leather waste collagen fiber composite and investigated its capture effect and mechanism on iodine vapor. The results showed that the composite had a high iodine capture capacity, which was primarily attributed to the existence of active functional groups and charge transfer between the pyrazole moieties and iodine.
The highly specific capture of radioactive iodine vapor generated during spent fuel reprocessing exerts a pivotal influence on ensuring the sustainable development of nuclear energy. In this study, we successfully prepared pyrazole-directed functionalized leather waste collagen fiber composite (Pyrazole@ACF) by immobilizing pyrazole ring through Schiff base reaction on the alkaline-activated collagen fiber (ACF) interface. The peak capacity for capturing iodine vapor by Pyrazole@ACF is shown to be 3.494 g/g, which is markedly higher compared to that of ACF (0.928 g/g). Pyrazole@ACF was characterized using FE-SEM, FT-IR, and XPS, revealing the release of numerous active functional groups from ACF that facilitated iodine-induced capture and pyrazole ring immobilization. Furthermore, the interaction mechanism between functional groups and iodine was further elucidated through Density Functional Theory (DFT) calculations. The iodine capture effect of Pyrazole@ACF is primarily ascribed to the existence of active functional groups (C = O, -OH, and -NH2) on ACF, as well as the charge transfer occurring between the grafted pyrazole moieties and iodine, ultimately leading to the generation of I-3(-) polyiodide complexes and subsequent iodine capture. Consequently, Pyrazole@ACF exhibits a strong specific capture capability for iodine vapor, along with excellent thermal stability and iodine immobilization properties, meeting the application requirements under practical conditions.
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