Abstract Magnetoresponsive, methacrylate-based 3D polymer networks containing hydrophilic/thermoresponsive, hydrophilic/pH-responsive and hydrophobic/metal chelating functionalities and oleic acid-coated magnetite nanoparticles, have been synthesized by conventional crosslinking radical polymerization and further evaluated as adsorbents for the removal of U(VI) ions from aqueous media. The adsorption properties of the networks prior and after magnetization regarding U(VI) ion removal from aqueous solutions of varying acidity and initial U(VI) concentration have been investigated. The effect of pH on the interaction of the adsorbents with U(VI) ions was shown to differ dramatically depending on solid phase composition, due to the fact that in the magnetite-loaded network, the Fe 3 O 4 nanoparticles act as buffers by binding solution protons. Nevertheless, U(VI) adsorption on both types of adsorbents follows the Langmuir adsorption isotherm and the value of their maximum adsorption capacity is q max = ∼0.02 mol kg −1 showing no statistically significant differences. The magnetic properties of these materials make their removal and adsorbed uranium separation from the aqueous phase quite simple by using an external magnetic field.

中文翻译：

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磁响应聚合物网络作为吸附剂从水介质中去除 U(VI) 离子

摘要 磁响应、基于甲基丙烯酸酯的 3D 聚合物网络包含亲水/热响应、亲水/pH 响应和疏水/金属螯合官能团和油酸包覆的磁铁矿纳米粒子，已通过常规交联自由基聚合合成，并进一步评估作为吸附剂去除来自水介质的 U(VI) 离子。已经研究了关于从不同酸度和初始 U(VI) 浓度的水溶液中去除 U(VI) 离子的磁化前后网络的吸附特性。pH 值对吸附剂与 U(VI) 离子相互作用的影响显示出因固相组成而显着不同，因为在载有磁铁矿的网络中，Fe 3 O 4 纳米颗粒通过结合作为缓冲剂溶液质子。尽管如此，U(VI) 在两种类型的吸附剂上的吸附都遵循朗缪尔吸附等温线，它们的最大吸附容量值为 q max = ∼0.02 mol kg -1 ，没有统计学上的显着差异。这些材料的磁性使得通过使用外部磁场将它们从水相中去除和吸附的铀分离变得非常简单。