期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 49, 页码 46251-46260出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b18018
关键词
MOF; GO; composite membrane; water purification; antifouling self-healing
资金
- Advanced Talents Incubation Program of Hebei University [050001-521000981137]
- Youth Science Foundation of Hebei Province [B2019201420]
- State Key Laboratory of Separation Membranes and Membrane Processes (Tianjin Polytechnic University) [M2-201802]
Graphene oxide (GO) with a two-dimensional lamellar structure and single-atom thickness has exhibited advantages in water purification by stacking to a continuous membrane. However, a proper method to further increase the separation property of the GO membrane is still urgently needed. Besides, damage to the membrane during the full-scale application processes and the resulted consequential loss are prevalent problems need to be solved. Here, a hierarchically assembled GO composite membrane was developed that can achieve high-efficiency water purification performance and self-healing property via the synergistic effect of the metal organic framework (MOF) and the coated hydrophilic layer of chitosan. The intercalated MOF effectively expanded the channel space of GO and endowed the channels with molecular-sieving property. Meanwhile, the coated chitosan layer can selectively adsorb water and achieve self-healing through the cross-linking reaction. The prepared GO composite membrane shows largely improved water flux (14.62 L m(-2) h(-1) bar(-1)), increased 344% than the water flux of the GO membrane, high rejection ratio (>99% for dyes), and good antifouling performance. In addition, the damaged GO composite membrane can recover its water flux (95%) and rejection ratio (96%) through a facile self-healing process.
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