Abstract
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.
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