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用紫外分光光度法对功能单体和模板分子间的结合作用进行了研究,选择结合作用最强的甲基丙烯酸作为功能单体。用γ-甲基丙烯酰氧丙烯基三甲氧基硅烷对硅胶表面进行修饰,以邻苯二甲酸二甲酯作为模板分子,在硅胶表面聚合制备了邻苯二甲酸酯表面分子印迹聚合物微球(MIPMs)。用傅里叶红外和扫描电镜对产物进行了表征,吸附等温曲线实验选择了效果最好的正己烷作为溶剂,实验表明:MIPMs-模板分子在4h左右达到吸附平衡。Scatchard法分析了MIPMs-模板分子的吸附平衡常数(K)和吸附容量(Q),结果显示高吸附容量曲线Kd1=36.36mmol·L-1,Qmax1=33.58μmol·g-1;低吸附容量曲线Kd2=0.8850mmo·L-1,Qmax2=8.504μmol·g-1。选择性吸附实验结果表明MIPMs具有很好的选择性吸附能力。
The binding between functional monomer and template molecule was studied by UV spectrophotometry. As the functional monomer, methacrylic acid with the strongest binding effect was chosen. The surface of the silica gel was modified with γ-methacryloxypropyltrimethoxysilane, and the surface of the silica gel was polymerized with dimethyl phthalate Balls (MIPMs). The products were characterized by Fourier transform infrared (FTIR) and scanning electron microscopy (SEM). The best isopropanol was selected as the solvent by isothermal curve experiment. The results showed that the adsorption equilibrium of MIPMs-template molecule reached to about 4h. Scatchard analysis of MIPMs-template molecules adsorption equilibrium constant (K) and adsorption capacity (Q), the results showed that the high adsorption capacity curve Kd1 = 36.36mmol·L-1, Qmax1 = 33.58μmol · g-1; low adsorption capacity curve Kd2 = 0.8850 mmo · L-1, Qmax2 = 8.504 μmol · g-1. Selective adsorption experiments show that MIPMs have good selective adsorption capacity.