NH_3等离子体特性及表面改性PAN超滤膜

NH_3 plasma properties and surface modification PAN ultrafiltration membrane

针对超滤膜表面易受蛋白质污染的问题,采用低温氨等离子体改性聚丙烯腈(PAN)超滤膜,对放电过程中NH_3等离子体进行光谱诊断.通过测定改性前后膜接触角、纯水通量和BSA通量等指标,分析等离子体改性后超滤膜亲水性和抗污染性能的变化.结果表明,功率120 W,处理时间120s,接触角由原膜的57°降至20°,纯水通量、BSA通量和截留率均明显增大,等离子体改性能够有效提高超滤膜的亲水性和抗污染能力.通过双谱线法计算得出,等离子体放电过程中,电子温度随功率的增大而减小;随着压强的增大,电子温度逐渐升高.

As ultrafiltration membrane surface is susceptible to protein fouling,Polyacrylonitrile(PAN)ultrafiltration membrane was modified by low temperature NH3 plasma,and the NH3 plasma was diagnosed during the discharge process.The hydrophilicity and anti-fouling ability of the plasma modified ultrafiltration membrane were analyzed by using the contact angle of the membrane,pure water flux and BSA flux and other indicators before and after modification.The results show that the contact angle is reduced from 57°to 20°,and that pure water flux,BSA flux and interception rate significantly increase,when the power is 120W and the treatment time is 120s.The hydrophilicity and anti-pollution ability are effectively improved by plasma modified.During the plasma discharge process,calculated by the bispectrum method,the electron temperature declines with the increase of the power,but grows with the increase of pressure.