Effective capture of radioactive iodine vapor is a crucial part of the spent fuel reprocessing process. In this study, humic acid (HA), which has excellent recognition capture of iodine vapor, is introduced as the active site construction center, functionalizing and modifying alkali-activated collagen fiber (ACF), to prepare the biomass composite functional materials (HA@ACF). The results demonstrate that HA@ACF exhibits exceptional recognition ability and a strong affinity for iodine vapor, with an adsorption capacity of 2811.8 mg/g (ACF is only 1068.6 mg/g). Simultaneously, under relative humidity of 27 % and strong acid conditions, the iodine vapor capture capacity of HA@ACF only decreased by 17.2 %, indicating that the material exhibits excellent iodine capture performance under complex conditions. The excellent adsorption performance is attributed to the synergistic effect of abundant −NHR, C = O, and phenolic hydroxyl active sites in HA@ACF, which recognize and induce iodine vapor, resulting in the capture of iodine molecules as I. Meanwhile, DFT calculations reveal the excellent adsorption energy (−0.51 eV) of iodine vapor on the phenolic hydroxyl groups on HA. Therefore, the HA@ACF biomass composite functional material can be an ideal candidate adsorbent for the efficient recognition capture of radioactive iodine vapor in airborne effluent.

中文翻译：

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腐植酸基多酚功能化胶原纤维可有效识别捕获碘蒸气


有效捕获放射性碘蒸气是乏燃料后处理过程的关键部分。本研究引入对碘蒸气具有优异识别捕获能力的腐殖酸（HA）作为活性位点构建中心，对碱活化胶原纤维（ACF）进行功能化和改性，制备生物质复合功能材料（HA@活性碳纤维）。结果表明，HA@ACF 对碘蒸气表现出优异的识别能力和很强的亲和力，吸附容量为 2811.8 mg/g（ACF 仅为 1068.6 mg/g）。同时，在相对湿度27%和强酸条件下，HA@ACF的碘蒸气捕获能力仅下降17.2%，表明该材料在复杂条件下表现出优异的碘捕获性能。优异的吸附性能归因于HA@ACF中丰富的−NHR、C = O和酚羟基活性位点的协同作用，这些活性位点识别并诱导碘蒸气，从而将碘分子捕获为I。同时，DFT计算揭示了碘蒸气对 HA 上酚羟基的优异吸附能 (-0.51 eV)。因此，HA@ACF生物质复合功能材料可以成为有效识别捕获空气中放射性碘蒸气的理想候选吸附剂。