邻苯二甲酸二甲酯分子印迹聚合物修饰TiO_2纳米线的制备及环境监测应用

Synthesis of molecularly imprinted polymer( MIP) on surface of TiO_2 nanowire and assessement of its application in environment monitoring

本文以γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)修饰的TiO_2纳米线为载体,邻苯二甲酸二甲酯(DMP)为模板分子,甲基丙烯酸(MAA)为功能单体,三羟甲基丙烷三甲基丙烯酸酯(TRIM)为交联剂,偶氮二异丁腈(AIBN)为引发剂,乙腈-甲苯(3∶1,V/V)为溶剂,采用沉淀聚合的方式制备DMP表面分子印迹材料.紫外光谱法、核磁共振和分子模拟表明MAA与DMP通过氢键以2∶1结合.采用红外光谱仪、透射电子显微镜、热重分析仪、粒度分析仪表征了材料的特性,采用聚合物吸附热力学、吸附动力学和吸附特异性表征了材料的吸附性能.该材料制备成固相萃取柱后能应用于环境土壤中DMP的测定.

In this paper, a novel surface molecularly imprinted polymer（MIP） was prepared using γ-methacryloyloxypropyltrimethoxysilane （KH570） modified TiO2 nanowire as supporter, dimethyl phthalate （DMP） as template, methacrylic acid （MAA） as functional monomer, trimethylolpropane trimethacrylate （ TRIM ） as crosslinker, azodiisobutyronitrile （ AIBN ） as initiator, and acetonitrile- toluene （ 3：1, V/V） as porogen. Ultraviolet spectrometry （UV） , nuclear magnetic resonance （NMR） and molecular simulation revealed that MAA binds to DMP through hydrogen bonds with a ratio of 2 ： 1. The properties of MIP were characterized by infrared spectrometry （ IR）, microscope（ TEM ）, particle size analyzer and thermogravimetric analyzer （ transmission electron TG）. The MIP was packed into SPE cartridge and applied in the determination of DMP residues in soil.