The recovery of iodide ion (I^–) from aqueous solutions is of great significance to economic development. Photoassisted electrochemically switched ion exchange (P-ESIX) takes advantage of the photo/electron bioactivity of EIXMs, which has been used for the recovery of bromide ion (Br^–) to increase the adsorption capacity of Br^–. To further expand the application of P-ESIX, we used iodide-vacancy bismuth oxyiodide (I^–-vacancy BiOI) as the photoelectroactive ion exchange material (P-EIXM) for the recovery of I^–. The results showed that an I^–-vacancy BiOI film can effectively recover I^– and improve the adsorption capacity because of its excellent selectivity and visible light adsorption ability. Compared with ESIX, the I^– adsorption capacity increases by 1.38 times with a growth rate of 37.4% at 0.6 V (vs SCE). Also, the film electrode still retains 84.0% of the initial adsorption capacity after 10 cycles of use. The mechanism of P-ESIX system was further analyzed on the basis of the energy band structure theory. It is not only innovative and efficient technology for the recovery of I^– but also shows that P-ESIX has potential as a new technology for a wide range of applications in the selective recovery of target ions.

中文翻译：

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具有固有光/电双活性恢复的 BiOI – 采用新型光辅助电化学开关离子交换技术

从水溶液中回收碘离子（I- ^{）对经济发展具有重要意义。}光辅助电化学切换离子交换 (P-ESIX) 利用 EIXM 的光/电子生物活性，已用于回收溴离子 (Br ^– ) 以增加 Br – 的吸附^容量。为了进一步扩大 P-ESIX 的应用，我们使用碘化物-空位碘化铋 (I ^- -vacancy BiOI) 作为光电活性离子交换材料 (P-EIXM) 用于回收 I ^-。结果表明，I-^空位BiOI薄膜可以有效恢复I-并因其优异的选择性和可见光吸附能力而提高吸附能力。与 ESIX 相比，在 0.6 V（vs SCE）下，I-^吸附容量增加了 1.38 倍，增长率为 37.4%。此外，薄膜电极在使用 10 次循环后仍保留 84.0% 的初始吸附容量。在能带结构理论的基础上，进一步分析了P-ESIX体系的机理。它不仅是 I 回收的创新和高效技术，^而且表明 P-ESIX 作为一种新技术在目标离子选择性回收方面具有广泛应用的潜力。