摘要
膜蒸馏技术在海水淡化及高盐废水处理中展现出极大的优势与潜力,静电纺丝纳米纤维膜因其较高的水通量和较低的传质阻力引起了研究者们广泛的关注.但其疏松多孔的孔隙结构易受到水流剪切力的作用导致膜孔变形,引起膜孔润湿.本研究从膜的结构出发,对热压后的聚偏氟乙烯(PVDF)纳米纤维膜采用聚二甲基硅氧烷(PDMS)和TiO2纳米颗粒(TiNPs)混合溶液浸渍涂覆,制备出了具有坚固孔隙结构的超疏水纳米纤维膜.该膜接触角高达160.3°,具有良好的膜蒸馏性能,在测试中表现出了39.3 kg/(m^(2)·h)的高水通量和长达102 h的耐久性,且截留率大于99.99%,为今后膜蒸馏膜的设计提供了一定的指导意义.
Membrane distillation(MD)technology shows excellent advantages and potential in seawater desalination and high saline wastewater treatment,and electrospun nanofiber membranes have attracted extensive attention from researchers due to their high water flux and low mass transfer resistance.However,its loose and porous pore structure is susceptible to deformation of membrane pores caused by the shear force of water flow,which leads to wetting of membrane pores.In this study,we prepared superhydrophobic nanofiber membranes with a robust pore structure by impregnating and coating polyvinylidene fluoride(PVDF)nanofiber membranes with a mixture of polydimethylsiloxane(PDMS)and TiO2 nanoparticles(TiNPs)after hot pressing.The membrane has a contact angle of up to 160.3°and excellent membrane distillation performance,as well as high water flux of 39.3 kg/(m^(2)·h)and durability up to 102 h in MD with a retention rate of more than 99.99%,which provides some guidance for the design of MD membranes in the future.
作者
吴强
周军浩
李一心
刘子强
张路
王暄
吕晓龙
WU Qiang;ZHOU Junhao;LI Yixin;LIU Ziqiang;ZHANG Lu;WANG Xuan;LYU Xiaolong(State Key Laboratory of Separation Membranes and Membrane Processes,School of Materials Science and Engineering,Institute of Biochemical Engineering,Tiangong University,Tianjin 300387,China;Nanchong Vocational College of Culture and Tourism,Department of Economic Management,Nanchong 637400,China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2024年第1期63-70,共8页
Membrane Science and Technology
基金
国家自然科学基金(51978466)
天津市科技计划项目(21ZYJDJC00050)。
关键词
膜蒸馏
PVDF纳米纤维膜
孔隙结构
抗润湿
静电纺丝
membrane distillation
PVDF nanofiber membrane
pore structure
anti-wetting
electrospinning
