针对聚偏氟乙烯(PVDF)膜在染料废水处理中存在的疏水性强、水通量低及膜污染严重等问题,采用壳聚糖(CS)和海藻酸钠(SA)双亲水改性剂分别对PVDF膜进行功能化改性。通过相转化法制备了系列改性膜,系统探究了不同改性剂配比对膜性能的影响。结果表明:CS改性膜(A5,0.5% CS)展现出显著的性能优势,其水通量达759.49L/(m2·h),较未改性膜提升79.56%,且对甲基橙、罗丹明B及孔雀石绿的截留率分别提升18.34%、36.59%和28.21%;抗污染性能方面,A5膜的水通量恢复率高达86.21%,较SA改性膜(B2)提升15.38%,表现出优异的亲水性和抗污染性能。
To address issues such as high hydrophobicity,low water flux,and severe membrane fouling in polyvinylidene fluoride (PVDF) membranes for dye wastewater treatment,this study used chitosan (CS) and sodium alginate (SA) as dual hydrophilic modifiers to functionalize PVDF membranes.Series of modified membranes were successfully prepared via phase inversion method,and the effects of different modifier ratios on membrane performance were systematically investigated.The results showed that the CS-modified membrane (A5,0.5% CS) exhibited significant performance advantages,with a water flux of 759.49L/(m2·h),representing an increase of 79.56% compared to unmodified membranes,and improved rejection rates of methyl orange,rhodamine B,and malachite green by 18.34%,36.59%,and 28.21%,respectively.In terms of anti-fouling performance,the water flux recovery rate of A5 membrane reached 86.21%,which was 15.38% higher than that of SA-modified membrane (B2),demonstrating excellent hydrophilicity and anti-fouling properties.
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基金资助
陕西省重点研发计划项目(2024SF-YBXM-573);西安市科技计划项目(23GXFW0023)
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