School of Mathematics and Physics, Mianyang Teachers' College, Mianyang 621000, PR China.
State Key Laboratory of Environment-friendly Energy Materials, Sichuan Co-Innovation Center for New Energetic Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Nuclear Waste and Environmental Safety Key Laboratory of Defense, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang 621010, China.
Int J Biol Macromol. 2023 Jul 1;242(Pt 3):124998. doi: 10.1016/j.ijbiomac.2023.124998. Epub 2023 May 24.
In this work, a novel g-CN filled, phosphoric-crosslinked chitosan gel bead (P-CS@CN) was successfully prepared to adsorb U(VI) from water. The separation performance of chitosan was improved by introducing more functional groups. At pH 5 and 298 K, the adsorption efficiency and adsorption capacity could reach 98.0 % and 416.7 mg g, respectively. After adsorption, the morphological structure of P-CS@CN did not change and adsorption efficiency remained above 90 % after 5 cycles. P-CS@CN exhibited an excellent applicability in water environment based on dynamic adsorption experiments. Thermodynamic analyses demonstrated the value of ΔG, manifesting the spontaneity of U(VI) adsorption process on P-CS@CN. The positive values of ΔH and ΔS showed that the U(VI) removal behavior of P-CS@CN was an endothermic reaction, indicating that the increase of temperature was great benefit to the removal. The adsorption mechanism of P-CS@CN gel bead could be summarized as the complexation reaction with the surface functional groups. This study not only developed an efficient adsorbent for the treatment of radioactive pollutants, but also provided a simple and feasible strategy for the modification of chitosan-based adsorption materials.
在这项工作中，成功制备了一种新型的 g-CN 填充的磷酸交联壳聚糖凝胶珠（P-CS@CN），用于从水中吸附 U(VI)。通过引入更多的官能团来提高壳聚糖的分离性能。在 pH 5 和 298 K 下，吸附效率和吸附容量分别可达 98.0%和 416.7 mg g-1。吸附后，P-CS@CN 的形态结构没有变化，经过 5 次循环后，吸附效率仍保持在 90%以上。基于动态吸附实验，P-CS@CN 在水环境中表现出优异的适用性。热力学分析表明了 ΔG 的价值，表明 U(VI)在 P-CS@CN 上吸附过程的自发性。ΔH 和 ΔS 的正值表明 P-CS@CN 的 U(VI)去除行为是一个吸热反应，表明升高温度有利于去除。P-CS@CN 凝胶珠的吸附机制可以概括为与表面官能团的络合反应。本研究不仅开发了一种用于处理放射性污染物的高效吸附剂，而且为壳聚糖基吸附材料的改性提供了一种简单可行的策略。
