PVDF/ZrO_2杂化膜的制备及吸附牛血红蛋白的性能

Synthesis of PVDF/ZrO_2 Hybrid Membranes and Its Adsorption Property Toward Bovine Hemoglobin

将3-氨丙基三乙氧基硅烷(APTES)表面修饰的ZrO2纳米颗粒添加到聚偏氟乙烯(PVDF)铸膜液中制备了PVDF/ZrO2杂化膜,应用SEM,TG-DTA和XRD对其结构进行了表征.结果表明,ZrO2纳米颗粒沉积在PVDF膜孔内和膜表面;ZrO2的掺杂改变了PVDF膜孔径的大小,杂化膜的孔径随着ZrO2粒子负载量的增加而增大.对牛血红蛋白(BHb)的吸附实验结果表明,PVDF/ZrO2杂化膜对BHb的吸附量显著高于PVDF原膜,当BHb初始浓度为150μg/mL,pH=7,吸附时间为45 min时,PVDF/ZrO2杂化膜的平衡吸附量为0.181 mg/cm2.其吸附动力学符合一级动力学模型;吸附等温线符合Langmuir等温方程式.

PVDF/ZrO2 hybrid membranes was synthesized by blending the PVDF casting solution and ZrO2 nanoparticles whose surface was modified by 3-aminopropyltriethoxysilane. Scanning electron microscopy （SEM）, X-ray diffraction（XRD） and thermal analysis were used to character the membranes. The results showed that the functionalized ZrO2 nanoparticles were deposited on the surface and entrapped into the inner pores of PVDF. The pore size of PVDF was affected by ZrO2 additions, which were enlarged as the ZrO2 loading amounts increased. The adsorption experiments of BHb showed that an enhanced adsorption capacity was observed for PVDF/ZrO2 hybrid membranes. When the initial concentration of BHb was 150 μg/mL, the pH value was 7 and the contact time was 45 min, the maximum capacity of hybrid membrane was 0.181 mg/cm2 . Its adsorption kinetics was in accordance with the first order kinetics model, and the adsorption iso-thermal was fitted to the Langmuir equation.