摘要
膜蒸馏技术在工业废水处理中具有一定的应用潜力和优势,然而膜污染和膜润湿问题严重阻碍其产业化发展。将氧化石墨烯(GO)和聚乙烯亚胺(PEI)通过真空抽滤的方法沉积到疏水性聚偏氟乙烯(PVDF)膜表面,制备了表面亲水、基底疏水的膜蒸馏用GO复合膜(PVDF-GO/PEI),对膜表面微观结构进行表征,并将其应用于直接接触膜蒸馏对印染废水的处理中,对膜蒸馏过程中膜的抗润湿性及抗污染性能进行了研究。结果表明,GO层明显提高了膜表面亲水性,且对渗透通量影响较小。PVDF-GO/PEI复合膜对于印染废水中的污染物具有较高的截留性能,有机物截留率99.7%,色度可被完全去除。同时,对比原PVDF膜和PVDF-GO膜,PVDF-GO/PEI复合膜表现出稳定的渗透通量,且具有更好的抗润湿性能。分析表明,PVDF-GO/PEI复合膜优异的截留和抗润湿性能归因于膜亲水性的增强和其稳定的二维结构。
Membrane distillation(MD)has shown great potential and advantage in the treatment of industrial waste⁃water.However,membrane fouling and wetting severely impede the industrial application of MD.In this study,a gra⁃phene oxide(GO)MD membrane(PVDF-GO/PEI)with hydrophilic top layer and hydrophobic sublayer was fabri⁃cated via vacuum filtrated GO and polyethyleneimine(PEI)on a polyvinylidene fluoride(PVDF)membrane surface.The microstructure of the membrane surface was characterized.PVDF-GO/PEI composite membrane was applied to direct contact membrane distillation for the treatment of printing and dyeing wastewater,and the antiwetting and an⁃tifouling properties of the membrane during the membrane distillation process were studied.The results showed that GO had a slight effect on mass transfer of membrane but increased the surface hydrophilicity.The PVDF-GO/PEI composite membrane had high retention performance for pollutants in printing and dyeing wastewater,with an or⁃ganic matter retention rate of 99.7% and complete removal of chromaticity.Meanwhile,compared to the original PVDF membrane and PVDF-GO membrane,the PVDF-GO/PEI composite membrane showed stable permeation flux and better antiwetting performance.Analysis showed that the excellent retention and antiwetting properties of PVDF-GO/PEI composite membranes were attributed to the enhanced hydrophilicity of the membranes and their stable two-dimensional structure.
作者
黄世燕
娄蒙蒙
李璟孜
李方
HUANG Shiyan;LOU Mengmeng;LI Jingzi;LI Fang(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;Textile Pollution Controlling Engineering Center of Ministry of Environmental Protection,Donghua University,Shanghai 201620,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2023年第7期169-176,共8页
Industrial Water Treatment
基金
上海市科技创新行动计划项目(21DZ1209900)。
关键词
氧化石墨烯
直接接触膜蒸馏
印染废水
交联剂
抗润湿
graphene oxide
direct contact membrane distillation
dyeing wastewater
crosslinking
antiwetting
