邻苯二甲酸二丁酯印迹吸附材料的合成及性能评价

Synthesis and evaluation of adsorption properties of dibutyl phthalate molecular imprinted material

摘要:

在硅胶表面通过乙烯基三甲氧基硅烷接枝，以邻苯二甲酸二丁酯（DBP）为模板分子，丙烯酸为功能单体制备了DBP印迹聚合物。采用紫外光谱法(UV)研究单体与模板间的相互作用，扫描电子显微镜表征印迹聚合物的表面形貌，红外光谱分析聚合物的结构特征。用平衡吸附实验方法研究聚合物对 DBP的结合性能，用Scatchard法分析了MIP-DBP的吸附解离常数(Kd)和吸附容量(Q)。结果表明，高亲和位点的解离常数Kd1=0.0284 mmol L-1，最大表观结合量Qmax1=4.035 祄ol g-1。低亲和位点的解离常数Kd2=0.675 mmol L-1，最大表观结合量Qmax2=30.507 祄ol g-1。制备的印迹聚合物对DBP的结构类似物邻苯二甲酸二甲酯(DMP)和邻苯二甲酸二甲氧乙酯(DMOP)的分离因子(α)分别为2.04和1.57，表现出较好的选择性识别能力。

Abstract:

molecularly imprinted polymers(MIP) for Dibutyl phthalate(DBP) was synthesized on the surface of silica gel with DBP as template molecule, acrylic acid as functional monomer and vinyltrimethoxysilane as grafting agent. The intermolecular interaction between acrylic acid and DBP was confirmed by ultraviolet spectroscopy(UV) , the surface morphology of the MIP was characterized by scanning electron microscope (SEM) and the structure of polymers was analyzed by fourier transform infrared spectroscopy (FTIR). The binding properties of the MIP were evaluated by equilibrium adsorption experiment method. The scatchard plot suggested that the template-polymer system had two site of adsorption behavior with the dissociation constant(Kd) of 0.0284 mmol L-1, 0.675 mmol L-1 and the max adsorption capacity(Qmax) of 4.035 祄ol g-1, 30.507 祄ol g-1 for the higher affinity site and lower affinity site, respectively. In addition, the selectivity factor of DBP towards dimethyl phthalate(DMP) and bis(methoxyethyl) phthalate (DMOP) was 2.04 and 1.57, respectively. Indicating good recogntion characteristic to DBP.