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Endeavoring a High Amidoxime Utilization Ratio and Adsorption Capacity for Uranium Extraction From Seawater: A Hydrogen Bonding Reconstruction Strategy
Author(s) -
Yang Guohui,
Zhang YangYang,
Zhu QiuHong,
Xia Xue,
Pan Ning,
Ma Chunyan,
Liu Jiale,
Liu Yang,
Qin Yilin,
Zhang Qingdong,
Dong Faqin,
Li Jun,
Nie Xiaoqin
Publication year - 2025
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202425281
Subject(s) - seawater , uranium , adsorption , materials science , extraction (chemistry) , hydrogen bond , chemical engineering , chromatography , molecule , metallurgy , chemistry , organic chemistry , oceanography , engineering , geology
Abstract Functionalized amidoxime [AO, R−C(NH 2 )═N(OH)] is widely used for uranium extraction from seawater, but increasing the effective functional sites for high AO utilization in adsorbents remains challenging. This study introduces a hydrogen bond reconstruction strategy to enhance uranium extraction efficiency of AO‐modified polyacrylonitrile (PAN) fibers by blending with polyvinyl alcohol (PVA). The PAN/PVA fibers are synthesized via electrospinning, followed by amidoximation on PAN to prepare PAN‐AO/PVA adsorbents. These materials can extract uranyl ions from the uranyl‐carbonate complex in seawater, achieving an adsorption capacity of 21.0 mg g⁻¹ under simulated seawater conditions with 330 ppb uranium concentration over 24 h. PVA blending increases AO utilization efficiency by 4 times (from 1/291 to 1/69), exceeding most reported values. The adsorbent also shows excellent reusability, retaining over 95% capacity after seven adsorption–desorption cycles. Quantum‐chemical studies based on density functional theory reveal that PVA modulates the hydrogen bonding network by shifting intramolecular bonds in PAN‐AO to intermolecular ones with PVA, increasing permeability and exposing more active N and O sites. Additionally, PVA's hydroxyl groups coordinate with UO₂ 2 ⁺, enhancing uranyl adsorption through an enthalpy‐entropy synergy relationship. This strategy offers a practical approach to improving uranium extraction from seawater.

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