CL-20分子印迹聚合物的构建及吸附特性分析

Construction and Adsorption Characterization of CL-20 Molecularly Imprinted Polymer

为快速筛选并确定合适的分子印迹预聚合体系,高效制备对土壤、地下水等生态环境中残留的CL-20具有特异性吸附能力的分子印迹聚合物(MIPs),以单质炸药CL-20为模板分子,利用Gaussian 16软件和紫外光谱分析对预聚合体系中的功能单体进行筛选和配比确定,用来协助CL-20分子印迹聚合物(CL-20-MIPs)的设计,并基于优化结果,采用乳液聚合法制备了CL-20-MIPs,对其微观结构和吸附能力进行研究。结果表明:CL-20与丙烯酰胺(AM)之间的相互作用最强,并且当化学配位比为4时,形成的预聚合体系更稳定;红外光谱试验显示共聚反应成功引发,说明乳液聚合法可用于CL-20-MIPs的制备;热重、电镜试验显示CL-20-MIPs在200℃以下具有良好的稳定性,其粒径的大小约为200 nm;吸附试验显示CL-20-MIPs对CL-20的吸附过程存在两种作用位点,符合Freundlich吸附模型和伪二级反应动力学方程,为多分子层特异性化学吸附。该研究结果可为分子印迹技术应用于高能量密度爆炸物CL-20的快速、痕量检测提供依据。

To quickly screen and identify suitable Molecular imprinted pre-polymerization systems for the efficient preparation of molecularly imprinted polymers with specific adsorption capacity for CL-20 residues in soil,groundwater and other ecological environments,this study uses monomeric explosive CL-20 as a template to assist in the design of CL-20 molecularly imprinted polymers by screening and ratio determination of functional monomers in the pre-polymerization system using Gaussian16 software and UV-vis.The experimental results show that the strongest interaction between CL-20 and AM,and the formed prepolymer system is more stable when the chemical coordination ratio is 4.According to the optimization results,the study prepared CL-20-MIPs using emulsion polymerization nand investigated their microstructure and adsorption capacity.IRspectroscopy indicates successful initiation of copolymerization reaction,and emulsion polymerization method is suitable for the preparation of CL-20-MIPs.TG and SEM experiments show that CL-20-MIPs have good stability below 200℃,and their particle size is about 200 nm.Adsorption experiments show that there are two sites of action in the adsorption process of CL-20-MIPs on CL-20,and the adsorption process is in accordance with the Freundlich adsorption model and the pseudo-secondary kinetic equation,which is multi-molecular layer-specific chemisorption.The results of the study can provide a basis for the application of molecular blotting technology to the rapid trace detection of high energy density explosives CL-20.