The past several decades have witnessed great achievements in the development of advanced materials for disposing of iodine that poses a risk to public health. However, little attention has been paid to the reutilization of the captured iodine. Herein, we report on the modification of sesbania gum (SG) with polyvinylpyrrolidone (PVP) via a radical polymerization strategy, and we investigate the modified SG (mSG) as an adsorbent for iodine capture, as well as the use of the captured iodine for antibacterial purposes. The PVP loading and hydrophilic−hydrophobic balance of mSG were controlled facilely by tuning the feed ratio of SG to N-vinyl-2-pyrrolidone. The as-obtained mSG served as an efficient adsorbent for iodine capture from solution, by undergoing a complexation reaction of pyrrolidone groups with I₂ and polyiodide (i.e., I₃^–). More significantly, after a series of in vitro antibacterial tests against Escherichia coli (10⁸ CFU∙mL⁻¹) and column filtration assays, the as-captured iodine on mSG could be reutilized as an antibacterial agent to combat pathogens. We believe that this proposed strategy based on the synergism of iodine adsorption and reuse should have great potential for environmental remediation and public healthcare.

在过去的几十年里，在开发用于处理对公共健康构成威胁的碘的先进材料方面取得了巨大成就。然而，很少有人关注捕获的碘的再利用。在此，我们报告了通过自由基聚合策略用聚乙烯吡咯烷酮 (PVP) 改性田菁胶 (SG)，并研究了改性 SG (mSG) 作为碘捕获的吸附剂，以及捕获的碘用于抗菌目的。通过调整 SG 与 N-乙烯基-2-吡咯烷酮的进料比，可以轻松控制 mSG 的 PVP 负载量和亲水-疏水平衡。通过进行吡咯烷酮基团与 I ₂和多碘化物（即，I ₃ ^–）。更重要的是，经过一系列针对大肠杆菌(10 ⁸  CFU∙mL ^-1 ) 的体外抗菌试验和柱过滤试验，在 mSG 上捕获的碘可以重新用作抗菌剂来对抗病原体。我们认为，这种基于碘吸附和再利用协同作用的拟议策略在环境修复和公共医疗方面具有巨大潜力。