Yang Fang, Zhong Xingyu, Lu Lihong, Shi Hongfa, Liu Xin, Zhang Wenqing, Zhang Lingfan
School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China.
School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China; Research Center of Analysis and Test, East China University of Science and Technology, Shanghai 200237, PR China.
Int J Biol Macromol. 2025 Jul;318(Pt 3):145207. doi: 10.1016/j.ijbiomac.2025.145207. Epub 2025 Jun 11.
The fabrication of composite materials that exhibit facile separability while retaining exceptional adsorption capacity for uranium adsorption remains a challenge. In this study, phytic acid-modified chitosan/sodium alginate@melamine sponge composite (PCSS@MS) was successfully fabricated via a cross-linking approach. The obtained PCSS@MS was applied to evaluate the adsorption properties for uranium from solutions. SEM and XRD characterization confirmed the material's stable three-dimensional porous architecture. The adsorption experiments revealed that PCSS@MS demonstrates highly uranium adsorption capability across a broad pH range, achieving a maximum adsorption capacity of 297.86 mg g at 318 K. PCSS@MS exhibited >95 % U(VI) removal efficiency at 200 mg/L under optimal conditions (pH = 5, 298.15 K, 80 mg). Furthermore, the adsorbent retained a remarkable 70.8 % uranium removal rate after four consecutive adsorption-desorption cycles. The adsorption behavior was consistent with the pseudo-second-order model and Temkin isotherm model, indicating the existence of multiple adsorption sites on the surface and the chemisorption process. FTIR and XPS analyses revealed that phosphate groups played a dominant role in U(VI) binding, with auxiliary contributions from amino, carboxyl, and hydroxyl groups. The synergistic coordination among these functional groups enhanced uranium adsorption abilities. These findings highlight PCSS@MS as a promising adsorbent for efficient uranium extraction from aqueous solutions.
制备出在保持对铀的优异吸附能力的同时还具有易于分离特性的复合材料仍然是一项挑战。在本研究中，通过交联法成功制备了植酸改性壳聚糖/海藻酸钠@三聚氰胺海绵复合材料（PCSS@MS）。将所得的PCSS@MS用于评估从溶液中吸附铀的性能。扫描电子显微镜（SEM）和X射线衍射（XRD）表征证实了该材料稳定的三维多孔结构。吸附实验表明，PCSS@MS在较宽的pH范围内都表现出很高的铀吸附能力，在318K时达到最大吸附容量297.86mg/g。在最佳条件（pH = 5，298.15K，80mg）下，PCSS@MS对200mg/L的U(VI)去除效率>95%。此外，经过四个连续的吸附-解吸循环后，吸附剂仍保持着70.8%的显著铀去除率。吸附行为符合准二级模型和Temkin等温线模型，表明表面存在多个吸附位点且发生了化学吸附过程。傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）分析表明，磷酸基团在U(VI)结合中起主导作用，氨基、羧基和羟基也有辅助作用。这些官能团之间的协同配位增强了铀的吸附能力。这些发现突出了PCSS@MS作为从水溶液中高效提取铀的有前景的吸附剂的地位。
