三嗪基有机多孔材料的制备及碘吸附性能研究

Preparation of triazine-based organic porous materials and iodine adsorption properties

核工业废料中放射性碘(^(131)I)威胁着人类的身体健康和环境。近年来,开发高效捕获碘的材料备受科研人员的关注。文中通过“一锅法”无催化剂的亲核取代反应,将廉价易得的三聚氰氯和哌嗪(手性哌嗪)单体聚合成一种二维富氮共价有机聚合物(COPs)。在其层状骨架中,单体间强的C—N键聚合使之具有优异的热稳定性和耐化学腐蚀性。基于此,文中的2种COPs材料在气相和水相中表现出较好的碘吸附能力。研究结果表明:在水溶液中COP-1、COP-2对碘的吸附量分别高达1.76 g/g与2.02 g/g;在碘蒸气中(85℃)COP-1、COP-2对碘吸附量分别高达1.6 g/g与2.13 g/g。相比之下,COP-2表现出更好的碘吸附能力。这类富氮有机聚合物多孔材料在多相碘吸附和富集方面表现出潜在的应用价值。

Radioactive iodine(^(131)I) in nuclear industrial waste seriously threatens human health and the environment.In recent years,the development of materials for efficient capture iodine has attracted more and more attentions.Covalent organic polymers(COPs)were prepared by a "one-pot" synthesis method and catalyst-free nucleophilic substitution reaction using cheap and easily available cyanuric chloride and piperazine linkers including achiral and chiral piperazine monomers.This layer-like structure endows COPs with excellent thermal stability and chemical corrosion resistance.COPs exhibit good iodine adsorption capacity in both gas and aqueous solutions.These results show that the iodine adsorption capacity of COP-1 and COP-2 is 1.76 g/g and 2.02 g/g in aqueous solution,respectively.Furthermore,the iodine adsorption capacity of COP-1 and COP-2 reach to 1.6 g/g and 2.13 g/g in vapour phase(85 ℃),respectively.In contrast,COP-2 exhibited better iodine adsorption capacity.Such nitrogen-rich porous organic polymer materials show potential applications in iodine adsorption and enrichment under multiphase conditions.