混合溶剂对TiO_2/PVDF平板超滤膜性能和结构的影响  

EEFFECTS OF MIXED SOLVENT ON MEMBRANE STRUCTURE AND PERFORMANCE OF TIO_2/PVDF COMPOSITE MEMBRANES

作　　者：闫勇[1,2] 赵长伟[2] 曾楚怡[1] 张琳[3] 王圆圆[2] 栾兆坤[2] 

机构地区：[1]湘潭大学,湖南湘潭411105 [2]中国科学院生态环境研究中心环境水质学国家重点实验室,北京100085 [3]南昌大学,江西南昌330031

出　　处：《水处理技术》2012年第1期27-31,共5页Technology of Water Treatment

基　　金：国家高技术研究发展计划(863)项目(2009AA062901;2009AA063901)

摘　　要：采用N,N-二甲基乙酰胺(DMAC)和N-甲基吡咯烷酮(NMP)为混合溶剂制备PVDF超滤膜。考察了不同混合比例的DMAC和NMP对膜性能及膜结构的影响,同时利用扫描电子显微镜(SEM)对膜表面及断面结构进行分析,原子力学显微镜(AFM)对膜表面粗糙度进行了分析,利用接触角测量仪对膜表面接触角进行了测量。结果表明,使用混合溶剂对膜孔径和膜亚层结构影响较大,但混合溶剂对膜孔隙率和接触角基本没有影响。当混合溶剂DMAC/NMP为1:2时,膜性能达到最优,孔隙率为70%,平均孔径为0.24μm,水通量为373 L.m-2.h-1,截留率为88%。A new type ofpolyvinylidene fluoride （PVDF）ultrafiltration membrane was prepared with N,N-dimethylacetamide （DMAC） and N-methyl pyrrolidone （NMP） as mixed solvent. The effect of mixed solvent in different proportions on the performance and structure of hybrid membranes was investigated by SEM,AFM, contact angle goniometer. The results showed mixed solvent DMAC/NMP had influence on membrane performance and structure. Sublayer structure and average pore diameter was effected,but porosity and membrane surface contact angle was unchanged. When the DMAC/NMP mixed was 1：2, the excellent PVDF composite membranes with porosity was 70%, average pore diameter was 0.24 μm, the water flux was 373 L. m^-2. h^-1 and retention rate was 88%.

关 键 词：聚偏氟乙烯(PVDF) 混合溶剂 膜结构 膜性能 

分 类 号：TQ028.8[化学工程]