聚砜中空纤维膜由于其独特的性质成为广泛使用的基膜之一, 微生物污染是其使用过程中常见的一个严峻问题, 量子点具有粒径小, 生物毒性强等特点, 在抑制微生物的生长方面有重要作用.本文主要研究量子点修饰的聚砜中空纤维膜表面的抗菌性能, 通过在水相中合成了稳定的具有窄而对称荧光发射带的量子点CdTe, 以巯基丙酸作为表面修饰剂, 对其进行了荧光光谱、透射电镜表征, 得到了粒径约为3 nm的CdTe半导体纳米粒子；以二苯甲酮为光敏剂, 通过连续化紫外辐照的方法将亲水性单体甲基丙烯酸β羟乙酯接枝到中空纤维膜的表面, 利用羟基和羧基的反应成功地在其表面组装上量子点, 通过红外光谱进行表征；从野外环境中分离培养了棒状细菌B1, 其形态通过偏光显微镜和扫描电镜表征, 利用紫外分光光度计测量光学密度, 分析中空纤维膜上量子点的抗菌性能.结果表明, 经过改性, 细菌的光学密度由原膜的0.88降低到量子点改性膜的0.27.表明中空纤维膜的抗菌性有了较显著的改善.进而表明, 连续化紫外辐照改性的方法切实可行, 并展现了在工业应用领域的潜力.

The polysulfone hollow fiber membranes is one of the most widely used membranes in many fields due to its unique property, microbial fouling of membrane is one of the most severe challenges duing the application of the hollow fiber membrane. Quantum dots have been widely applied to inhibit the growth of microorganisms due to its small particle size, toxicity and other characteristics. This paper studies the antibacterical properties of CdTe quantum dots modified polysulfone hollow fiber membranes. The qualified CdTe quantum dots showing narrow and symmetric emission spectrum were successfully prepared in aqueous phase, Fluorescence Spectrum (FS) and TEM measurements were employed to characterized the CdTe, and its average size was calculated to b e 3nm. Benzophennone was used as photosensitizer, the polysulfone hollow fiber membrane was prepared by continuous ultraviolet photografting polymerization of β-Hydroxyethyl methacrylate onto membrane surface. Quantum dots were successfully assembled to the surface of the membranes due to the reaction between the hydroxyl group and carboxyl group, infrared spectroscope was employed to confirmed the modified membranes.Wild stranin B1 with average size of about 10μm was isolated the and cultivated, the morphology of wild strain B1 was characterized by scanning electron microscope and polarizingmicroscope. The antimicrobial capability of Quantum dots modified polysulfone hollow fiber membrane was estimated by optical density via ultraviolet spectrophotometer. The data showed that the optical density of the aqueous bacteria was decreased from 0.88 to 0.27 after quantum dots modified memebrane was applied, and consequently, the antibacterial performance of the modified membranes was improved evidently. Results indicated that the technique of continuous ultraviolet photografting polymerization shows a promising potential for modification of hollow fiber membranes in industrial scale.