多孔温敏四环素分子印迹吸附剂的制备及性能

Preparation and properties of temperature sensitive porous tetracycline molecularly imprinting adsorbent

结合高内相Pickering乳液聚合法和分子印迹技术,运用壳聚糖(CTs)纳米粒子稳定乳液制备了多孔温敏四环素(TC)分子印迹吸附剂(TPMIPs).理化表征显示TPMIPs材料具有多孔结构,孔径约为5μm.pH值为6.0时TPMIPs对TC的最大吸附量达到38.30μmol·g^(-1),TPMIPs的临界温度(LCST)约为34℃.TPMIPs吸附TC的过程中,Freundlich、Langmuir模型对本次吸附实验数据的拟合相关系数R^2均大于0.97,两种模型均可对等温吸附实验过程进行描述.一阶、二阶动力学模型拟合结果表明,该吸附过程兼具物理吸附和化学键作用.TPMIPs经5次吸附脱附实验后吸附量损失约为12.38%,说明材料吸附再生性良好.

Combined with high-internal-phase Pickering emulsion polymerization and molecularlyimprinting technique, porous temperature-sensitive tetracycline-imprinted adsorbents（ TPMIPs）were synthesized using chitosan nanoparticles（ CTs） as emulsion stabilizer. Physicochemical characterization results indicated that TPMIPs possessed porous structure with an average pore size of about 5 μm. TC adsorption by TPMIPs reached a maximum value of 38.30 μmol·g^（-1） at pH 6.0. The lower critical solution temperature（ LCST） of TPMIPs was about 34 ℃. The isotherm data were well fitted by both Freundlich and Langmuir models with R^2 greater than 0.97,indicating that isothermal adsorption process could be described by the two models. The results of pseudo-first-order and pseudo-second-order kinetic models indicated that the adsorption process possessed both physical adsorption and chemical bond effect. After five adsorption-desorption cycles,the adsorption quantity of TPMIPs decreased by about 12. 38%,demonstrationly TPMIPs possessed a good regenerative performance.