Covalent organic framework modified polyamide nanofiltration membrane with enhanced performance for desalination
2017
Wang, Chongbin | Li, Zhiyuan | Chen, Jianxin | Li, Zhen | Yin, Yongheng | Cao, Li | Zhong, Yunlong | Wu, Hong
A novel thin film nanocomposite (TFN) membrane was prepared by incorporating covalent organic frameworks (COFs) into polyamide (PA) layer on a polyether sulfone (PES) substrate, through interfacial polymerization method. The porous structure of COFs (SNW-1) provided more passageway for water transport. Meanwhile, the reaction between SNW-1 and trimesoyl chloride (TMC) during interfacial polymerization formed strong covalent bonds for better interface compatibility. The surface hydrophilicity of the hybrid membrane was improved due to the existence of amine-rich SNW-1. The influence of the interfacial polymerization conditions and piperazine (PIP) and the loading of SNW-1 on the membrane performance were investigated. The resultant PA-SNW-1/PES membrane with a SNW-1 loading of 1g/m² exhibited an increased pure water flux from 100Lm⁻²h⁻¹MPa⁻¹ to 192.5Lm⁻²h⁻¹MPa⁻¹ compared to the pristine PA membrane while the rejection to Na2SO4 maintained above 80%. Moreover, the membrane also showed long-term running stability.
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