掺杂无机纳米粒子的阿魏酸分子印迹复合膜的制备

分子印迹膜是一种兼具分子印迹技术与膜分离技术双重优点的新兴技术,但由于有机膜的力学强度较小,在分离过程中容易使印迹孔穴的空间变形和互补官能团位置的失稳,使得其分离效率大大降低。文中使用紫外光引发原位聚合的方法,以聚偏氟乙烯(PVDF)作为支撑膜,将无机纳米材料和铸膜液共混制备了含有无机纳米材料的阿魏酸分子印迹复合膜。利用红外光谱和扫描电镜测试了膜的结构和表面形貌,发现纳米粒子是以纯物理方式共混的,且都分散在孔的周围,有利于维持膜的孔穴结构。通过平板超滤装置对改性膜的分离性能、水通量和承压能力进行了研究,结果表明,添加质量分数0.5%18 nm TiO_2的改性膜性能最好,承压能力在0.4 MPa以上,分离因子在3.4左右,水通量为6696 L/(m~2·h)。

Modification of Ferulic Acid Composite Molecularly Imprinted Membrane with Blending Nanoparticles

Molecularly imprinted membranes which can operate in a continuous way exhibit advantages of the membrane separation technology and molecule imprinting technique.However,during synthesis of molecularly imprinted membranes,the presence of cross linker would make the membranes have poor flexibility and low mechanical strength,the easily deformed shape complementary to the template and the instability of functional groups in the separation process of molecularly imprinted membranes would reduce the separation efficiency.Consequently,it is difficult to apply under the pressure of traditional ultrafiltration membrane separation.Ferulic acid composite molecularly imprinted membranes with nanoparticles were developed by UV-situ polymerization on the surface of polyvinilidene fluoride (PVDF) membranes.The structure and morphology of membranes were characterized through Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM).Results show that nanoparticles are pure physical blending,and they are all scattered around holes to help maintaining pore structure.The separation performance and water flux of prepared membranes were evaluated by the cross flow membrane filtration equipment.As a result,the modified membranes blending with 0.5 ％ 18nm TiO2 have the best properties,with the mechanical capacity more than 0.4 MPa,the separation factor about 3.4,the water flux of 6696 L/(m2·h).