摘要
传统果汁浓缩技术存在营养损失大和口感差,以及设备管理成本高等缺点.近年来,正渗透技术因其可以弥补传统浓缩技术的缺陷,受到越来越多的关注.但浓缩过程中由于缺乏高性能的正渗透膜,大大限制了其应用推广.通过在聚砜支撑层背面构建碳纳米管(CNT)抗污染层,在支撑层表面界面聚合制备高性能聚酰胺复合正渗透膜,并应用于果汁浓缩.通过扫描电子显微镜的表征、支撑层盐扩散系数及TFC膜的水通量和反向盐通量的测定等方法,考察了CNT层对TFC膜结构及性能的影响.随后考察在实际果汁浓缩时TFC膜的通量衰减和恢复情况.结果表明,当抽滤CNT分散液的体积为20mL时,TFC膜性能最佳,浓缩果汁时膜通量显著优于未含CNT的对照膜.运行4 200min进行果汁浓缩时,膜通量衰减率和恢复率均明显优于对照膜.
The conventional technology for juice concentration often leads to severe nutrition loss and high costs.Recently,forward osmosis(FO)shows great potential for juice concentration.However,the lack of efficient FO membranes is one of the critical challenges for the development of FO technology.Thus,high performance thin film composite(TFC)forward osmosis membrane was fabricated by depositing carbon nanotubes on the back surface of PSf support to shrink the surface pores and synthesizing the polyamide on top surface of the PSf support.The impacts of CNT deposition on the performance of TFC polyamide membranes were investigated,and the results showed that the TFC membrane with CNT(TFC CNT20)achieved the best performance.After 4 200 min FO operation for juice concentration,the TFC membrane with CNT exhibited a lower flux decline percentage and a higher recovery percentage,compare with control membranes without the CNT.
作者
安晓婵
张翔宇
周宗尧
胡云霞
AN Xiaochan;ZHANG Xiangyu;ZHOU Zongyao;HU Yunxia(CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation,Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Yantai 264003,China;State Key Laboratory of Separation Membranes and Membrane Processes,National Center for International Research on Membrane Science and Technology,School of Materials Science and Engineering,Tianjin Polytechnic University,Tianjin 300387,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2018年第4期99-106,共8页
Membrane Science and Technology
基金
国家自然科学基金委(21476249,51708408)
烟台市重大研发计划(2015ZH063)
天津市重大平台项目(17PTSYJC00060)
山东省重点研发计划(2016ZDJS04B03)。
关键词
正渗透
高性能
碳纳米管
薄层复合膜
果汁浓缩
forward osmosis
high performance
carbon nanotubes
TFC membranes
juice concentration
