聚砜中空纤维膜的亲水性改性研究

Hydrophilic Surface Modification of Polysulfone Hollow Fiber Membrane

主要利用物理吸附的方法在聚砜(PSF)中空纤维膜表面引入聚乙二醇(PEG-400)亲水性基团,采用衰减全反射红外光谱(FTIR-ATR)、扫描电镜(SEM)对改性前后聚砜中空纤维膜进行表征,并考察不同浓度的改性剂对接触角(CA)和纯水通量性能的影响.结果表明,该聚砜中空纤维膜中PEG-400含量随着PEG-400浓度的增加而提高;SEM观察表明,改性剂吸附在膜表面,膜基体无明显变化,但观察发现,改性后部分膜孔被覆盖,膜孔径变小;CA研究表明,随着PEG-400浓度的增加,接触角减小;当浓度为8wt%时,接触角最小可以到达30°.膜的纯水通量随着PEG-400浓度的增加先增大后降低,因此,PEG-400浓度为1.5wt%时高达2 038L/(m2.h).

Hydrophilic PEG-400 was introduced into PSF hollow fiber membrane by physical adsorption. The modified membrane was characterized by attenuated total reflectance Fourier transform infrared spectroscopy（FTIR-ATR） and scanning electronic microscope （SEM）. And the effect of the concentration of modifier on the membrane contract angle（CA） and pure water flux performances were studied. ATR spectra showed that the PEC-400 content introduced into the membrane was increased with the increasing concentration of PEG-400 solution. It can be seen from SEM images that the modifier was only adsorbed on the surface of the membrane,and there was no significant changes in the cross-section of the membrane. After modified with PEG-400,the size of the pores on the surface decreased due to its partially covered by PEG-400. The CA decreased with the increasing concentration of PEG-400 solution, and it reached 30° when the concentration increased to 8wt %. The pure water flux of the modified membrane first increased then decreased with the increasing concentration of PEG-400 solution, and achieved to the maximum 2038 L/（m^2 · h） when the concentration of PEG-400 was 1.5wt %.