Abstract
Effective extraction and regeneration of radioactive iodide is one of urgent concerns for the safe utilization of nuclear energy. As a novel environmentally benign ion separation technique, electrochemically switched ion extraction (ESIE) process can be applied for effective capture and recovery of iodide ions (I − ). Herein, a novel kelp seaweed-like core/shell I − imprinted polypyrrole@bismuth oxyiodide (PPy/I − @BiOI) composite film is successfully prepared for the selective I − capture in the ESIE system. It is found that the I − can be easily trapped in the PPy/I − @BiOI film after I − is in situ desorbed from the film by an electrochemical reduction process since it offers particular electroactive binding sites for I − extraction. The I − imprinted PPy/I − @BiOI film displays an extraction capacity as high as 325.2 mg·g −1 for I − with favorable stability. In particular, the extraction and desorption of I − is achieved by adjusting the redox potential and the pristine PPy/I − @BiOI film can be regenerated and reused for multiple times without decrease in extraction capacity. It is expected that such a PPy/I − @BiOI film would be useful as an electrochemically switched renewable extractor that could capture and regenerate I − from radioactive water.
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