Uranium could be released into the aquatic ecological environment through various sorts of nuclear-related procedures, which has high toxicity and carcinogenicity even with a trace amount. A novel phosphonic acid functionalized cellulose adsorbent (PVKAP) with a simple synthesis strategy is developed based on pumpkin vine cellulose (PVK) as the substrate material for efficient and selective capturing U(VI). Because of the strong coordination between phosphonic acid groups and U(VI), the adsorption efficiency and adsorption selectivity of modified cellulose to U(VI) are greatly improved. The adsorption behavior follows the Langmuir adsorption model and pseudo-second-order kinetics model. The maximum adsorption capacities (pH = 5, T = 293 K) of PVK and PVKAP obtained from Langmuir isotherm are 57.2 and 714.3 mg∙g⁻¹, and the adsorption equilibrium are reached in 240 and 35 min, respectively. Additionally, PVKAP has a high adsorption selectivity which reached 70.36% for U(VI) in multi-ion condition, and recycling studies have shown that PVKAP has good recyclability. Furthermore, batch adsorption experiments and spectral analysis reveal that the efficient enrichment of U(VI) on PVKAP could mainly attribute to the inner layer complexation. Therefore, this environmentally friendly and simple route prepared PVKAP has good a potential application value for U(VI) enrichment in aqueous media related to nuclear waste.

中文翻译：

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磷酸功能化的具有生物选择性的纤维素，具有很高的选择性和捕获水溶液中U（VI）的能力

铀可以通过各种与核有关的程序释放到水生生态环境中，即使微量也具有高毒性和致癌性。以南瓜葡萄纤维素（PVK）为底物，开发了一种具有简单合成策略的新型膦酸官能化纤维素吸附剂（PVKAP），以高效选择性地捕获U（VI）。由于膦酸基团与U（VI）之间的强配位，大大提高了改性纤维素对U（VI）的吸附效率和吸附选择性。吸附行为遵循Langmuir吸附模型和伪二级动力学模型。最大吸附容量（pH = 5，T由Langmuir等温线获得的PVK和PVKAP的＝ 293K）分别为57.2和714.3mg∙g ^-1，分别在240和35min内达到吸附平衡。此外，PVKAP具有很高的吸附选择性，在多离子条件下对U（VI）的吸附选择性达到70.36％，循环利用研究表明PVKAP具有良好的循环利用性。此外，批吸附实验和光谱分析表明，PVKAP上U（VI）的有效富集主要归因于内层的络合。因此，这种环保且简单的路线制备的PVKAP具有丰富的U（VI）富集与核废料有关的水性介质的潜在应用价值。