低温等离子体改性聚偏氟乙烯超滤膜的性能  

Performance of Polyvinylidene Fluoride Ultrafiltration Membrane Modified by Low Temperature Plasma

作　　者：杨庆[1,2,3] 李鹏[1] 丁昀[1] 许小艳[1] 刘俊洁[1] 张兆盼[1] 

机构地区：[1]兰州交通大学环境与市政工程学院 [2]兰州交通大学寒旱地区水资源综合利用教育部工程研究中心 [3]教育部长江学者创新团队(IRT0966),甘肃兰州730070

出　　处：《高分子材料科学与工程》2013年第7期80-83,89,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(50578072);甘肃省交通储运扬尘治理工程中心开放课题(512279);大学生创新实验计划项目(201204)

摘　　要：采用丙烯酸（AA）作为改性单体,对聚偏氟乙烯（PVDF）中空纤维膜进行等离子体化学沉积改性。通过傅里叶变换衰减全反射光谱仪（ATR-FT-IR）分析发现,改性后的膜表面引入了羧基、羟基等亲水性官能团。经低温等离子体改性后的膜,清水通量提高20%~30%,膜面和膜孔的Zeta电位分别提高了694%和58.66%,在过滤分离凹凸棒悬浊液实验中,改性膜通量衰减百分比,较原膜平均降低了8.44%,仅经水力清洗后的改性膜通量恢复率,较原膜提高8%。Acrylic acid was used as modified monomer to modify polyvinylidene fluoride （PVDF） hollow fiber membrane by plasma modification. Through the attenuated total reflection infrared spectrum （ATR-FT-IR） and scanning electron microscopy （SEM） measurements, the chemical composition and morphology change of the original and modified membranes surface were analyzed. The results show that hydrophilic functional groups such as carboxyl and hydroxyl were introduced onto the surface of modified membranes. The water flux of modified membranes, Zeta potential and flux response to pH before and after modification were studied by the contrast test. The results show that after modified by low-temperature plasma, membrane flux increases by 20 % - 30 %, membrane surface and membrane pore zeta potential increase by 694 % and 58.66 % respectively, and the pollution-resistant ability of modified membranes increase by 8.44 % when they filtrated and separated attapulgite suspension liquid. Only after hydraulic cleaning, the flux recovery rate of the modified membrane is 8% higher than that of the original membrane.

关 键 词：聚偏氟乙烯 超滤膜 低温等离子体 膜改性 ZETA电位 膜污染 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业]