温敏型分子印迹水凝胶的制备及对有机磷阻燃剂的吸附性

  目的  制备一种兼温度响应与高选择识别性能于一体的分子印迹水凝胶(T-MIHs)。  方法  以磷酸三(2-氯丙基)酯Tris (2-chloropropyl) phosphate, TCPP]为模板分子，丙烯酸为功能单体，N-异丙基丙烯酰胺为温敏单体，N,N′-亚甲基双丙烯酰胺为交联剂，过硫酸铵为引发剂，采用自由基聚合法制备了温度敏感的T-MIHs。利用红外光谱、核磁共振波谱、扫描电镜、差示扫描量热表征原料的结构，考察水凝胶对模板分子的特异识别性能。  结果  成功制备T-MIHs，其最低临界溶解温度为39 ℃；等温吸附符合Langmuir吸附理论模型，吸附动力学符合准一级吸附动力学模型。该分子印迹水凝胶对TCPP显示了良好的选择识别性，对模板分子的吸附容量为119.32 mg·g?1，印迹因子α=3.75，选择因子β=2.75，对TCPP的识别具有温度响应性。  结论  T-MIHs对水溶液中TCPP具有优异的吸附效果，同时对构筑有机磷阻燃剂高选择识别性的温敏印迹水凝胶具有重要参考。图9表4参30

Preparation of thermo-sensitive molecularly imprinted hydrogels and their adsorption properties for organophosphorus flame retardants

  Objective  The objective is to prepare thermo-sensitive molecularly imprinted hydrogels (T-MIHs).   Method  Tris (2-chloropropyl) phosphate (TCPP) was used as template molecule, acrylic acid as functional monomer, N-isopropylacrylamide as thermo-sensitive monomer, N,N′-methylene-bis-acrylamide as crosslinking agent and ammonium persulfate as initiator. The thermo-sensitive T-MIHs was prepared by free radical polymerization. The structure of the raw materials was characterized by infrared spectroscopy, nuclear magnetic resonance spectroscopy, scanning electron microscopy, and differential scanning calorimeter. The specific recognition performance of the hydrogel on template molecules was also investigated.   Result  T-MIHs was successfully prepared and its lowest critical dissolution temperature was 39 ℃. The adsorption isotherm conformed to the Langmuir adsorption theoretical model, and the adsorption kinetics conformed to the pseudo-first-order kinetic model. The molecularly imprinted hydrogel showed a good selective recognition for TCPP, and its adsorption capacity for the template molecule was 119.32 mg·g?1, the imprinting factor α=3.75, the selection factor β=2.75, and the identification of TCPP was temperature responsive.   Conclusion  T-MIHs has excellent adsorption effect on TCPP in aqueous solution, which is of great significance for building thermo-sensitive imprinted hydrogels with high selectivity for organophosphorus flame retardants. Ch, 9 fig. 4 tab. 30 ref.]