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首先以间苯二胺为模板分子,通过与3-异氰酸丙基三乙氧基硅烷反应合成含模板分子的功能性单体,其化学结构经红外光谱、质谱和核磁共振谱等表征手段证实。进一步加入交联剂四乙氧基硅烷(TEOS)合成分子印迹杂化物(MIH),并对该杂化物的形成机理进行探索。另外,通过测定杂化物对模板分子等温吸附容量和竞争性吸附容量,研究杂化物的吸附性能和选择性识别能力。MIH对间苯二胺分子的最大吸附容量为7.42 mg/g,而非分子印迹杂化物(NIH)的最大吸附容量为3.20 mg/g。MIH对间苯二胺的结构类似物苯胺和2,4,6-三溴苯胺的非特异性吸附容量很小,仅分别为1.99和0.98 mg/g,且NIH的这些值与MIH的相接近。上述结果表明间苯二胺的MIH对间苯二胺具有良好的吸附能力和吸附选择性。
First of all, phenylenediamine is used as a template molecule to synthesize a functional monomer containing a template molecule by reaction with 3-isocyanatopropyltriethoxysilane. The chemical structure of the functional monomer is characterized by infrared spectroscopy, mass spectrometry and nuclear magnetic resonance spectroscopy Confirmed. The molecularly imprinted hybrid (MIH) was further synthesized by the addition of tetraethoxysilane (TEOS), and the formation mechanism of the hybrid was explored. In addition, the adsorption capacity and selective recognition ability of hybrids were studied by measuring the isothermal adsorption capacity and competitive adsorption capacity of hybrids to template molecules. The maximum adsorption capacity of MIH to m-phenylenediamine was 7.42 mg / g, while the maximum adsorption capacity of non-molecularly imprinted hybrid (NIH) was 3.20 mg / g. The nonspecific adsorption capacity of MIH for the structural analogs of m-phenylenediamine aniline and 2,4,6-tribromoaniline was only 1.99 and 0.98 mg / g, respectively, and the values of NIH were close to that of MIH. The above results show that m-phenylenediamine has good adsorption capacity and adsorption selectivity to m-phenylenediamine.