甲基橙分子印迹聚合物的制备及性能研究

发布时间：2018-07-26 17:53

【摘要】：以甲基橙(MO)为模板分子、丙烯酰胺(AM)为功能单体、乙二醇二甲基丙烯酸酯(EDMA)为交联剂、偶氮二异丁腈(AIBN)为引发剂、邻苯二甲酸二丁酯(DBP)为溶胀剂、聚苯乙烯微球为种球,通过种子溶胀法,探讨了不同溶剂制备的甲基橙分子印迹聚合物(MO-MIPs)的红外谱图及其对模板分子的吸附能力;使用最佳溶剂进行溶剂用量探讨。当溶剂用量为10 m L时,所制备的M O-M IPs对M O吸附效果最好;选取最优条件下制备的M O-M IPs,进行了最佳p H确定、斯卡查德曲线分析、热力学模型曲线拟合以及循环使用次数测试,结果最佳吸附p H为6;吸附过程中存在两类结合位点,其中高亲和力位点平衡解离常数为3.59 mg/L,最大吸附量为1.87 mg/g;低亲和力位点平衡解离常数为33.43 mg/L,最大吸附量为5.47 mg/g;热力学模型更符合弗伦德里希模型;经过8次循环利用,吸附量并没有明显的下降趋势。
[Abstract]:Methyl orange (MO) was used as template molecule, acrylamide (AM) as functional monomer, ethylene glycol dimethacrylate (EDMA) as crosslinking agent, azodiisobutyronitrile (AIBN) as initiator, dibutyl phthalate (DBP) as swelling agent and polystyrene microsphere as seed ball. The infrared spectra of methyl orange molecularly imprinted polymer (MO-MIPs) prepared in different solvents and its adsorption ability to template molecules were studied by means of seed swelling method. When the amount of solvent was 10 mL, the best adsorption effect of MO-M IPs was obtained, and the optimum pH was determined and the Szczard curve was analyzed. The best adsorption pH was 6, and there were two kinds of binding sites in the adsorption process. The equilibrium dissociation constant of high affinity sites is 3.59 mg / L, the maximum adsorption capacity is 1.87 mg / g, the equilibrium dissociation constant of low affinity sites is 33.43 mg / L, and the maximum adsorption capacity is 5.47 mg / g. There is no obvious downward trend of adsorption capacity.
【作者单位】：四川理工学院化学工程学院;四川理工学院化学与环境工程学院;四川理工学院分析测试中心;
【基金】：绿色催化四川省高校重点实验室开放基金项目(LYJ1405) 四川理工学院研究生创新基金项目(Y2015008)资助
【分类号】：O631.3

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