Abstract:

A series of MOF-808-AA catalysts grafted with different amino acids were prepared by post-synthesis modification method. The effects of pore structure and pore microenvironment on the catalytic performance of nerve agent simulant were studied, and the mimic enzyme properties of MOF-808 and MOF-808-AA were further explored. The results showed that amino acid modification caused changes in the pore structure and pore microenvironment of MOF-808, thereby affecting the catalytic performance of the catalyst against the mimic agent. Among them, the hydrogen bond and hydrophobic interaction provided by the amino acid side chain improve the affinity of MOF-808-AA to the simulant. After amino acid grafting, the number of active metal sites in the original structure of MOF-808 decreased, resulting in the decrease in the degradation rate. The acidity and alkalinity of the amino acid side chain groups could lead to differences of the pore microenvironment. When the side chain is a basic group such as amino, the catalytic efficiency of the simulant decontamination is significantly improved. However, when the side chain is a carboxyl group, the catalytic efficiency is significantly reduced.

Key words: MOF-808, amino acids, post-synthesis modification, nerve agent simulant

摘要：

通过后合成修饰方法制备了一系列不同氨基酸（amino acid，AA）接枝的MOF-808-AA催化剂，研究了孔结构和孔道微环境对神经毒剂模拟剂催化性能的影响，探索了MOF-808和MOF-808-AA的模拟酶性质。结果表明：氨基酸修饰造成MOF-808的孔结构和孔道微环境发生变化，从而影响催化剂对模拟剂的催化性能。其中，氨基酸侧链提供的氢键以及疏水作用使得MOF-808-AA对模拟剂的亲和力有所提升；氨基酸接枝后，MOF-808原始结构中的活性金属位点数量减少造成了降解速率的降低；氨基酸侧链官能团的酸碱性会导致孔道微环境差异，当侧链为氨基等碱性官能团时，催化效率明显提高，而当侧链为羧基时，催化效率则明显降低。

关键词: MOF-808, 氨基酸, 后合成修饰, 神经毒剂模拟剂