Tokar Eduard, Maslov Konstantin, Tananaev Ivan, Egorin Andrei
Institute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, 690022 Vladivostok, Russia.
School of Life Sciences, Far Eastern Federal University, 690090 Vladivostok, Russia.
Materials (Basel). 2021 Sep 23;14(19):5511. doi: 10.3390/ma14195511.
An Se-derivative of amidoxime was synthesized for the first time as a result of the reaction of oxidative polycondensation of N'-hydroxy-1,2,5-oxadiazole-3-carboximidamide with SeO: its elementary units are linked to each other due to the formation of strong diselenide bridges. The element composition of the material was established, and the structure of the elementary unit was suggested. The sorption-selective properties were evaluated, and it was found that the adsorbent can be used for the selective recovery of U (VI) from liquid media with a pH of 6-9. The effect of some anions and cations on the efficiency of recovery of U (VI) was estimated. Composite materials were fabricated, in which silica gel with a content of 35, 50, and 65 wt.% was used as a matrix to be applied in sorption columns. The maximum values of adsorption of U (VI) calculated using the Langmuir equation were 620-760 mg g and 370 mg g for the composite and non-composite adsorbents, respectively. The increase in the kinetic parameters of adsorption in comparison with those of the non-porous material was revealed, along with the increase in the specific surface area of the composite adsorbents. In particular, the maximum sorption capacity and the rate of absorption of uranium from the solution increased two-fold.
通过N'-羟基-1,2,5-恶二唑-3-甲脒与二氧化硒的氧化缩聚反应首次合成了一种偕胺肟的硒衍生物：其基本单元由于形成强二硒键而相互连接。确定了该材料的元素组成，并推测了基本单元的结构。评估了其吸附选择性性能，发现该吸附剂可用于从pH值为6 - 9的液体介质中选择性回收U(VI)。估计了一些阴离子和阳离子对U(VI)回收效率的影响。制备了复合材料，其中使用含量为35%、50%和65%重量比的硅胶作为基质应用于吸附柱。使用朗缪尔方程计算的复合材料和非复合材料吸附剂对U(VI)的最大吸附值分别为620 - 760 mg/g和370 mg/g。与无孔材料相比，揭示了复合材料吸附剂吸附动力学参数的增加以及比表面积的增加。特别是，最大吸附容量和从溶液中吸收铀的速率增加了两倍。
