During the reprocessing of irradiated nuclear fuel, radioactive iodine vapor—a hazardous substance threatening environmental safety and human health—is released in substantial quantities, creating an urgent need for adsorbents with high-efficiency iodine trapping capabilities. This study synthesizes BiOBr aggregates via hydrothermal method and loads them onto a three-dimensional (3D) porous aerogel, which is composed of crosslinked polyvinylpyrrolidone (PVP) and polyvinyl alcohol (PVA) (denoted as Bi@PVP/PVA). Compared with Bi@PVP and Bi@PVA, Bi@PVP/PVA shows significantly enhanced iodine adsorption performance: Bi@PVP/PVA-3, featuring a well-developed 3D porous network with optimized pore structure, achieves an exceptional iodine trapping capacity of 2482.2 mg/g at 85 °C, outperforming the single-polymer-supported counterparts. Characterizations confirm that crosslinking between PVP and PVA constructs a macroporous framework, which not only provides abundant sites for uniform loading of BiOBr aggregates but also facilitates iodine diffusion. Kinetic model analysis reveals the dual adsorption mechanism: the PVP/PVA porous network enables rapid trapping of iodine vapor, while chemical reactions between BiOBr and iodine ensure its firm immobilization. This synergistic effect of the carrier’s porous structure and the loaded BiOBr endows Bi@PVP/PVA aerogels with superior iodine treatment efficiency, highlighting their practical value in iodine capture during nuclear fuel reprocessing.
In response to the adverse events caused by the detachment of coatings during coronary guidewire interventions, this research investigates and optimizes the preparation process of a polyvinyl alcohol (PVA)/polyvinylpyrrolidone (PVP) coating with high adhesion and hydrophilicity. Using thermoplastic polyurethane (TPU) as the substrate, the coating was prepared via polydopamine (PDA) deposition and UV curing technology. The amounts of PVA, PVP, and polyethylene glycol diacrylate (PEGDA), as well as the proportion of the photoinitiator, were optimized through orthogonal experiments, significantly enhancing the hydrophilicity and adhesion of the coating. The optimized hydrophilic coating achieves a minimum water contact angle of 7.4°. The coating with the optimized formulation has a water contact angle of 12.2°, reaches grade 0 adhesion in the cross-cut test, and maintains a stable friction coefficient of 0.16. After water exposure, the water contact angle was 22.6°, and the friction coefficient remained below 0.2. Cytotoxicity tests showed cell viability between 90 % and 110 %, and the hemolysis rate was less than 5 %. These results indicate that the coating exhibits excellent hydrophilicity, adhesion, water resistance, and stability, offering significant potential to improve the safety and operability of coronary interventional guidewires, reduce coating-related adverse events, and enhance surgical quality and safety.
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