摘要
二维纳米材料氧化石墨烯(GO)可通过层层堆叠成膜、构建层间毛细孔道,用于脱盐应用。然而,GO膜在运行过程中的渗透性能及其稳定性都有待提升。以亲水的碳纳米管(CNTs)为改性物,在聚多巴胺(PDA)修饰的基膜上交替喷涂多层GO(MLGO)和CNTs,制备出了多元层状复合脱盐膜。当MLGO-CNTs的单位面积质量为72 mg/m^(2)时,复合膜在5 bar操作压力下对1 g/L Na_(2)SO_(4)溶液的盐截留率最高达到92.8%,水通量最高可达到4.8 L/(m^(2)·h·bar),较PDA-MLGO膜提高了71.4%。在400 h的连续错流过滤实验中,复合膜的水通量稳定性高于PDA-MLGO膜。CNTs的管内空间和MLGO-CNTs组装间隙为复合膜引入了有效的渗透通道。
Two-dimensional nanomaterial graphene oxide(GO) can be stacked layer by layer to form a desalination membrane with capillary channels.However,the permeability and performance stability of GO membrane still need to be improved.In this paper,a multi-layered composite desalination membrane was prepared by alternately spraying multi-layered GO(MLGO) and hydrophilic carbon nanotubes(CNTs) on a polydopamine(PDA)modified base membrane using CNTs as modifiers.When the mass loading of MLGO-CNTs was 72 mg/m^(2),the salt retention and water flux reached 92.8% and 4.8 L/(m^(2)·h·bar)(1 g/L Na_(2)SO_(4),5 bar).The water flux of PDA-MLGO-CNTs was 71.4% higher than that of the PDA-MLGO membrane.The permeation stability of the PDA-MLGO-CNTs membrane was higher than that of the PDA-MLGO membrane during a 400 h cross-flow filtration experiment.The spaces in CNTs and the assembly gaps of MLGO-CNTs introduced effective permeating channels for the composite membrane.
作者
魏杨扬
高学理
王剑
王小娟
高从堦
张雨山
WEI Yangyang;GAO Xueli;WANG Jian;WANG Xiaojuan;GAO Congjie;ZHANG Yushan(The Institute of Seawater Desalination and Multipurpose Utilization,MNR(Tianjin),Tianjin 300192,China;Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education/College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2024年第5期25-29,40,共6页
Technology of Water Treatment
基金
国家重点研发计划(2023YFE0101000)
国家自然科学基金(22278384)
海洋经济创新发展区域示范项目(BHSF2017-12)。
关键词
氧化石墨烯膜
碳纳米管
喷涂
脱盐
graphene oxide membrane
carbon nanotubes
spraying
desalination
