PSS-PDADMAC改性PES微滤膜及膜抗污染性能研究
作者:申利国,陆晓峰,潘玲,陈利芳,秦强
单位: 中国科学院上海应用物理研究所,上海 201800
关键词: 层层自组装;聚电解质;负电性;膜抗污染性
分类号: TQ028.8
出版年,卷(期):页码: 2014,34(6):96-99

摘要:
通过层层(LBL)自组装技术对聚醚砜(PES)微滤膜进行改性。以29.2g/L NaCl做为支撑电解质,在膜表面修饰一层聚二烯丙基二甲基氯化铵(PDADMAC)/聚苯乙烯磺酸钠(PSS)聚电解质膜。通过电位仪、水接触角分析仪、SEM、AFM、过滤评价装置等方法对膜进行测定分析。改性后膜的最外层为PSS,膜表面负电性增加,为-35.02mV,水接触角值降低,由未改性膜的59.86°降低到37.99°;膜的表面形貌表征显示,改性后的微滤膜,表面更加平整,孔径尺寸分布更加均一;在过滤0.02g/L腐殖酸时,试验120min后,未改性膜的通量下降为39.4%,而改性后的膜通量下降为15.5%,膜的抗污染性提高。
Polyether sulfone (PES) microfiltration membranes were modified by Layer-by-layer self-assembly technology. 29.2g/L NaCl was used as the supporting electrolyte. A polyelectrolyte layer of Poly dimethyl diallyl ammonium chloride(PDADMAC)/Poly(sodium-p-styrenesulfonate)(PSS) was coated on the surface of PES membranes. Zeta potential analysis, water contact angle analysis, SEM, AFM and the Ultrafiltration Cup system were used to evaluate the membranes. There are a lot of –SO3- in the molecules of PSS, which are modified at the outside surface of PES membrane. The modified membranes are more negatively charged, which is -35.02mV. The water contact angles decreased from 59.86° for unmodified membranes to 37.99° for the modified membranes. As for the surface morphology, the surface of modified membrane is smoother and the pore size is more uniform than the unmodified membrane. In 120 min filtration of 0.02g/L Humic Acid, the flux decrease rates for the unmodified and modified membranes are 39.4% and 15.5%, respectively. The antifouling ability of modified membrane was enhanced.

基金项目:
上海市科技攻关项目(08231200300)

作者简介:
申利国(1983-),男,河北邢台人,博士,从事分离膜制备与改性研究。

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