新型硅质吸附剂的合成及对黄酮的选择分离

Synthesis of Silica Adsorbent and Its Selective Separation for Flavone

利用分子印迹技术,以水溶性黄酮芦丁为模板剂与具有专一识别官能团的氯丙基三乙氧基硅烷反应制备出前驱物,然后将前驱物与正硅酸乙酯进行协同水解、凝胶老化和模板剂的洗脱,从而制备出对芦丁具有高效选择性的内置型硅质吸附剂.实验结果表明:该吸附剂具有较高的吸附容量,即使在有与芦丁结构相似的黄酮存在下,对芦丁依然有较高的选择性吸附能力;TEM照片表明该吸附剂具有与印迹分子相匹配的纳米孔洞,而对FTIR光谱分析表明该吸附剂在印迹识别过程有新的化学键生成.

One kind of built-in silica adsorbent, which has high adsorption selectivity to rutin, was synthesized using molecular imprinted technology by the following steps： synthesis of precursor from the reaction between water soluble rutin （as template molecule） and the functional monomer chloropropyhriethoxysilane, co-hydrolysis of the precursor and tetraethoxysilane （TEOS） , sol-gel aging process, and removal of template molecules. The results of adsorption experiment show that this adsorbent has a high adsorption capacity to rutin, and good adsorption selectivity to rutin even under the interference of flavone with similar structure. TEM photos suggest that nanocaves corresponding to rutin were formed inside the adsorbent, while FTIR detects that new bond was generated during the recognition process.