In this study, hierarchical porous polyacrylonitrile nanofibers were fabricated via electrospinning zeolitic imidazolate framework-8 (ZIF-8) and polyacrylonitrile (PAN), followed by tannic acid (TA) etching and amidoximation (denoted as p-PAN-AO). The as-prepared p-PAN-AO was utilized to remove radioactive U(VI) from sewage water and simulated seawater. The influence of uranium adsorption on p-PAN-AO was investigated as a function of uranium concentration, pH, and time. Adsorption kinetic experiments indicated that the pseudo-second-order kinetic model was fitted better than the pseudo-first-order model. Benefiting from amidoximation and hierarchical porous structure, the nanoadsorbent exhibited a high U(VI) adsorption capacity of 412.28 mg/g at 298 K. The thermodynamic analysis manifested a spontaneous and endothermic nature of U(VI) adsorption. The results demonstrated a potential application of the reported materials in nuclear wastewater and environmental cleanup.

中文翻译：

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通过具有分级多孔结构的酰胺肟化聚丙烯腈纳米纤维增强 U(VI) 吸附去除

在这项研究中，通过静电纺丝沸石咪唑酯骨架-8（ZIF-8）和聚丙烯腈（PAN），然后进行单宁酸（TA）蚀刻和酰胺肟化（表示为p-PAN-AO）制备了分级多孔聚丙烯腈纳米纤维。所制备的 p-PAN-AO 用于从污水和模拟海水中去除放射性 U(VI)。作为铀浓度、pH 值和时间的函数，研究了铀吸附对 p-PAN-AO 的影响。吸附动力学实验表明拟二级动力学模型比拟一级动力学模型拟合得更好。得益于酰胺肟化和分级多孔结构，纳米吸附剂在 298 K 下表现出 412.28 mg/g 的高 U(VI) 吸附容量。热力学分析表明 U(VI) 吸附具有自发和吸热性质。