ABSTRACT

The concentration distribution of electrons and free radicals in remote argon plasma were studied by using a langmuir probe and electron spin resonance. The polyvinylidene fluoride (PVDF) membranes were modified by remote argon plasma, analyzing the hydrophilic properties and antifouling of modified membranes surface. Furthermore, the membranes were characterized for their morphologies and chemical compositions by using scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS), respectively. The experimental results showed that the optimal region was 40 cm away from the discharge center. In the optimal condition of modification (RF power of 90 W, treatment time of 90 s and pressure of 20 Pa), the water contact angle of the PVDF membrane was reduced from 95.63 ° to 62.19 °. Simultaneously, the membrane has good water flux at about 151.98 L·(m2·h)-1, the maximum rejection rate and the minimum fouling rate were 90.0% and 34.70%, respectively.

摘要

利用朗缪尔探针和电子自旋共振研究了远程氩等离子体中电子和自由基的浓度分布。通过远程氩等离子体对聚偏二氟乙烯（PVDF）膜进行改性，分析改性膜表面的亲水性和防污性。此外，分别使用扫描电子显微镜 (SEM) 和 X 射线光电子能谱 (XPS) 对膜的形态和化学成分进行了表征。实验结果表明，最佳区域为距放电中心40 cm。在最佳改性条件下（RF功率90 W，处理时间90 s，压力20 Pa），PVDF膜的水接触角从95.63°降低到62.19°。同时，