Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, PR China.
Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, PR China.
Int J Biol Macromol. 2024 May;266(Pt 2):131112. doi: 10.1016/j.ijbiomac.2024.131112. Epub 2024 Mar 26.
In this work, the modified‑sodium alginate gel beads were prepared by sol-gel method. Due to the presence of water channels in the sodium alginate gel bead, amidoxime groups and PO were exposed to the surface of the adsorbent to the maximum extent, resulting in the excellent adsorption capacity of modified‑sodium alginate gel beads. The introduction of amidoxime-modified hydroxyapatite significantly improved the adsorption capacity and the adsorption rate of the gel beads. The adsorption capacity increased from 308.7 to 466.0 mg/g and the adsorption equilibrium time was shortened from 300 min to 120 min. The modified‑sodium alginate gel bead possessed the advantages of short adsorption time, high adsorption efficiency and large adsorption capacity, which could be regarded as a potential adsorbent for uranium. Moreover, the uranium removal ability on the modified gel beads was mainly attributed to the Coulomb force between PO and uranium and the complexation between uranium and amidoxime groups. In summary, this work would provide a new idea for the modification and application of sodium alginate-based materials.
在这项工作中，通过溶胶-凝胶法制备了改性海藻酸钠凝胶珠。由于海藻酸钠凝胶珠中存在水通道，因此最大程度地暴露了 amidoxime 基团和 PO 基团，从而使改性海藻酸钠凝胶珠具有优异的吸附能力。引入 amidoxime 改性羟基磷灰石显著提高了凝胶珠的吸附容量和吸附速率。吸附容量从 308.7mg/g 增加到 466.0mg/g，吸附平衡时间从 300min 缩短到 120min。改性海藻酸钠凝胶珠具有吸附时间短、吸附效率高、吸附容量大的优点，可作为铀的潜在吸附剂。此外，改性凝胶珠的铀去除能力主要归因于 PO 与铀之间的库仑力以及铀与 amidoxime 基团之间的络合作用。总之，这项工作为基于海藻酸钠的材料的改性和应用提供了新的思路。
