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Synthesis of N-containing porous aromatic frameworks via Scholl reaction for reversible iodine capture
Microporous and Mesoporous Materials ( IF 4.8 ) Pub Date : 2020-09-09 , DOI: 10.1016/j.micromeso.2020.110596
Jian Wang , Congcong Wang , Hongchao Wang , Bo Jin , Peiping Zhang , Lina Li , Shiding Miao

The effective capture of radioactive volatile iodine (131I and 129I) from nuclear waste stream is of vital significance. In this work three kinds of porous organic frameworks (POFs) knitting with N-containing building units were constructed via cost-effective and maneuverable Scholl reaction. The obtained PAFs exhibited moderate porosity and satisfying thermal stability. With coexistence of open porous structure, the electron-rich amino group featured with π-π interactions was found to improve the affinity to iodine, and the iodine uptake capacities were 408 wt%, 335 wt% and 268 wt% when the prepared POFs of P-DPDA, P-TPB and P-PC were employed for the adsorption experiments. The results were superior to most of the porous adsorbents including zeolite, metal-organic frameworks (MOFs) and porous organic polymers (POPs). Iodine adsorption capacities of 289.50 mg g−1 (for P-DPDA), 194.63 mg g−1 (for P-TPB) and 259.69 mg g−1 (for P-PC) in organic solution were achieved, and the adsorbed iodine molecules could be released to ethanol. Such promising and cost-effective materials can be envisaged for application in the field of nuclear waste management.



中文翻译:

通过Scholl反应合成可逆碘捕获的含氮多孔芳族骨架

从核废料流中有效捕获放射性挥发性碘(131 I和129 I)具有至关重要的意义。在这项工作中,三种用N编织的多孔有机骨架(POF)通过经济高效且可操纵的Scholl反应来构建包含建筑物的单元。所获得的PAF显示出适度的孔隙率并满足热稳定性。在存在开放的多孔结构的情况下,发现具有π-π相互作用特征的富电子氨基提高了对碘的亲和力,当制备POF时,碘的吸收能力为408 wt%,335 wt%和268 wt%。 P-DPDA,P-TPB和P-PC用于吸附实验。结果优于大多数多孔吸附剂,包括沸石,金属有机骨架(MOF)和多孔有机聚合物(POP)。碘的吸附量为289.50 mg g -1(对于P-DPDA),194.63 mg g -1(对于P-TPB)和259.69 mg g -1(对于P-PC)在有机溶液中达到了目标,吸附的碘分子可以释放到乙醇中。可以设想将这种有前途且具有成本效益的材料应用于核废料管理领域。

更新日期:2020-09-12
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