Efficient adsorbents for radioactive gas treatment in nuclear energy cycle is crucial for eliminating negative environmental impacts caused by wide nuclear applications. A Ni-based MOF material called JUC-86(Ni) which is based on 1-H-benzimidazole-5-carboxylic acid (HBIC) linker was synthesized for adsorbing the ⁸⁵Kr, ¹⁴CH₄ from off-gas stream. It was disclosed that there is a suitable pore environment for ⁸⁵Kr and ¹⁴CH₄ preferred adsorption in JUC-86 and the adsorption capacity could even reach 2.79 mmol/g (⁸⁵Kr) and 2.54 mmol/g (¹⁴CH₄) which are almost higher than all the adsorbents. The ⁸⁵Kr/N₂ and ¹⁴CH₄/N₂ IAST selectivities of the resulting sample are satisfactory (11.63 and 9.43) and well matched with the breakthrough experiments where the breakthrough times of ⁸⁵Kr and ¹⁴CH₄ are much longer than N₂. What’s more, the adsorption heats of ⁸⁵Kr and ¹⁴CH₄ are less than 30 kJ/mol which indicated a stronger affinity than N₂ and a low-energy regeneration. As simulation results showed that the adsorption distribution follows a-spiral-pattern which could be attributed to the N atom in the C=N, this is also the dominant factor of the ⁸⁵Kr and ¹⁴CH₄ preferable adsorption.

中文翻译：

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一种高效的镍基吸附剂，用于选择性去除核工艺废气流中放射性污染物中的 85Kr 和 14CH4


用于核能循环中放射性气体处理的高效吸附剂对于消除广泛核应用造成的负面环境影响至关重要。合成了一种名为 JUC-86（Ni） 的镍基 MOF 材料，该材料基于 1-H-苯并咪唑-5-羧酸 （HBIC） 接头，用于吸附废气流中的 ⁸⁵Kr、¹⁴CH₄。结果表明，JUC-86 中存在适合 ⁸⁵Kr 和 ¹⁴CH₄ 优先吸附的孔环境，吸附容量甚至可以达到 2.79mmol/g （⁸⁵Kr） 和 2.54mmol/g （¹⁴CH₄），几乎高于所有吸附剂。所得样品的 ⁸⁵Kr/N₂ 和 ¹⁴CH₄/N₂ IAST 选择性令人满意（11.63 和 9.43），并且与 ⁸⁵Kr 和 ¹⁴CH₄ 的突破时间比 N₂ 长得多的突破实验非常匹配。此外，⁸⁵Kr 和 ¹⁴CH₄ 的吸附热小于 30kJ/mol，表明比 N₂ 具有更强的亲和力和低能量再生。由于模拟结果表明，吸附分布呈螺旋状，可归因于 C=N 中的 N 原子，这也是 ⁸⁵Kr 和 ¹⁴CH₄ 吸附的主导因素。