摘要
以聚醚砜(PES)为膜材料,N甲基2吡咯烷酮(NMP)为溶剂,分别选用不同分子量的聚乙烯吡咯烷酮(PVPK10、PVPK30、PVPK50、PVPK70)为添加剂,利用相转化法制备了PES平板超滤膜。研究了制备条件对膜结构及性能的影响。当PES含量为18%(质量分数,下同),PVPK30添加量为6%时,超滤膜平均水通量和平均截留率最佳,分别为90.7L/(m^2·h)、95.1%。实验进一步测定了5组膜片对1g/L牛血清蛋白(BSA)溶液的截留率以及它们对取自生活饮用自来水和泳池水样滤出水的污染密度指数(SDI)值。结果表明,PES超滤膜对生活饮用水滤出水的SDI5min值随着截留率的升高而降低;针对泳池滤出水,随着超滤膜截留率的升高,其滤出水的SDI5min值没有明显变化。
The flat sheet ultrafiltration membranes were prepared through phase inversion with polyether sulfone (PES) as a membrane material, N -methyl- 2 -pyrrolidone as a solvent and polyvinyl pyrrolidone (PVP) with different molecular weights (PVP K10, PVP K30, PVP K50, PVP K70) as additives, and the effects of preparation conditions on the structure and performances of the resultant membranes were investigated. The results indicated that the average water flux and average rejection ratio of the membrane reached 90.7 L/(m ^2·h) and 95.1 %, respectively, when 18 wt% of PES and 6 wt% of PVP K30 was added. The rejection ratios of these five types of membranes for the boving serum albumin solution (1 g/L) were measured, and their silting density index (SDI) values of the water samples obtained from a drinking tap water and a swimming pool were also measured. It was found that the SDI 5 min value from the drinking tap water after five minutes filtering decreased with an increase of rejection ratio, but the SDI 5 min of filtered water in swimming pool kept a stable value with the rejection ratio.
作者
张芯
ZHANG Xin(Department of Chemistry and Chemical Engineering, Research Centre ofNew Materials, Ankang University, Ankang 725000, China)
出处
《中国塑料》
CAS
CSCD
北大核心
2019年第9期77-82,共6页
China Plastics
基金
安康学院科技扶贫专项(2018FPZX01)
关键词
聚醚砜
超滤膜
截留率
污染密度指数值
polyether sulfone
ultrafiltration membrane
rejection ratio
silting density index value
