School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China.
School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China.
J Colloid Interface Sci. 2019 May 15;544:14-24. doi: 10.1016/j.jcis.2019.02.079. Epub 2019 Feb 23.
In this study, we prepared a hydrothermal carbon-based supramolecular organic framework (HTC-MA-TMA) by grafting melamine and trimesic acid on hydrothermal carbon (HTC) for efficient removal of U (VI) from aqueous solutions. The nano-sized supramolecular organic framework (SOF) particles consisted of N-donor-containing melamine and O-donor-containing trimesic acid self-assembled through hydrogen bonds. Their large number of specific active sites acted as the immobilization center for capturing U (VI). Chemical modification facilitated the dispersion of the SOF particles on HTC, which was synthesized using a novel covalent/non-covalent bond strategy. The HTC-MA-TMA adsorbent exhibited exceptional U (VI) adsorption capacity (271.83 mg/g) because of the coordination interaction between UO and its ligands (amino, carboxyl and amide groups). The adsorption equilibrium was achieved within 30 min and followed a pseudo-second-order equation, suggesting the occurrence of a chemical adsorption process. Furthermore, the U (VI) ions adsorbed onto the HTC-MA-TMA adsorbent could be easily desorbed using 0.1 M HNO solution. This regeneration caused no significant decrease in the sorption capacity of the adsorbent. These results suggest that advanced HTC-MA-TMA adsorbent can be applied in the nuclear-fuel industry for extracting U (VI) from radioactive wastewater.
在这项研究中，我们通过在水热碳（HTC）上接枝三聚氰胺和均苯三甲酸，制备了一种水热碳基超分子有机骨架（HTC-MA-TMA），用于从水溶液中高效去除 U（VI）。纳米级超分子有机骨架（SOF）颗粒由含 N 供体的三聚氰胺和含 O 供体的均苯三甲酸通过氢键自组装而成。它们大量的特定活性位点充当了捕获 U（VI）的固定化中心。化学修饰促进了 SOF 颗粒在 HTC 上的分散，HTC 是使用新型共价/非共价键策略合成的。由于 UO 与配体（氨基、羧基和酰胺基团）之间的配位相互作用，HTC-MA-TMA 吸附剂表现出优异的 U（VI）吸附能力（271.83 mg/g）。吸附平衡在 30 分钟内达到，并遵循准二级方程，表明发生了化学吸附过程。此外，吸附在 HTC-MA-TMA 吸附剂上的 U（VI）离子可以很容易地用 0.1 M HNO3 溶液解吸。这种再生过程不会导致吸附剂的吸附容量显著下降。这些结果表明，先进的 HTC-MA-TMA 吸附剂可应用于核燃料工业，从放射性废水中提取 U（VI）。
