净水技术2025，Vol.44Issue(2)：65-71,7.DOI:10.15890/j.cnki.jsjs.2025.02.007
氯化钠凝固浴对PVDF超滤膜耐氯性的影响
Effect of Sodium Chloride Coagulation Bath on Chlorine Resistance of PVDF UF Membrane
摘要
Abstract
[Objective]The aim of this study is to investigate effect of coagulation bath composition on chlorine resistance of polyvinylidene fluoride(PVDF)UF membranes prepared by non-solvent induced phase separation method.[Methods]PVDF membranes were prepared using pure water(M0)and 200 g/L sodium chloride(NaCl)solution(M200)as coagulation bath,respectively.Effects of sodium hypochlorite(NaClO)aging on the chemical composition and properties of membranes were investigated through static accelerated aging experiments.Humic acid(HA)was used as a model organic foulant to examine the changes in antifouling performance of membranes before and after NaClO aging.[Results]Compared with the pure water coagulation bath,the use of NaCl solution as the coagulation bath increased the proportion of polar β-phase in the PVDF membrane from 69%to 81%,resulting in a decrease in pure water contact angle on membrane surface from 82.8° to 75.1°.NaClO aging led to oxidation loss of hydrophilic additives on both membranes,resulting in a reduction in hydrophilicity.However,there was no significant change in the crystal structure of the membranes.After NaClO aging,the higher fraction of polar β-PVDF phase in the M200 membrane made it more hydrophilic than M0.At the end of two cycles HA filtration experiments,the flux of the M0 and M200 membranes decreased to 26%and 48%of their initial flux,respectively.The reversible and irreversible fouling resistances of the M200 membrane were 54%and 28%lower than those of the M0 membrane,indicating that the anti-fouling performance of the M200 membrane was significantly better than that of the M0 membrane.Although the reduction in hydrophilicity caused by NaClO aging resulted in decreased anti-fouling performance for both membranes,the change in M200 membrane was less pronounced than that in the M0 membrane.By the end of the two cycles HA filtration experiments,the flux of the aged M0 and M200 membranes decreased to 13%and 40%of their initial flux,respectively.The reversible and irreversible fouling resistances of the aged M200 membrane were 71%and 62%lower than those of the aged M0 membrane,respectively.[Conclusion]Overall,NaCl coagulation bath increase the proportion of polar β-phase in the PVDF membrane and mitigate the degradation of anti-fouling performance of PVDF membrane due to NaClO aging,leading to improve chlorine resistance of PVDF membrane.关键词
超滤膜/非溶剂致相分离/凝固浴/聚偏氟乙烯(PVDF)/耐氯性Key words
UF membrane/non-solvent induced phase separation/coagulation bath/polyvinylidene fluoride(PVDF)/chlorine resistance分类
化学化工引用本文复制引用
张建林,崔航宇,张书嘉,马欣悦,李凯..氯化钠凝固浴对PVDF超滤膜耐氯性的影响[J].净水技术,2025,44(2):65-71,7.基金项目
陕西省自然科学基金项目(2023-JC-YB-448) （2023-JC-YB-448）
