In-situ coating of Fe-TA complex on thin-film composite membranes for improved water permeance in reverse osmosis desalination

被引:30
|
作者
Zhao, Qipeng [1 ]
Zhao, Die Ling [1 ,2 ]
Ee, Liang Ying [1 ]
Chung, Tai-Shung [1 ,3 ]
Chen, Shing Bor [1 ]
机构
[1] Natl Univ Singapore, Dept Chem & Biomol Engn, 4 Engn Dr 4, Singapore 117585, Singapore
[2] Zhejiang Normal Univ, Coll Geog & Environm Sci, Jinhua 321004, Zhejiang, Peoples R China
[3] Natl Taiwan Univ Sci & Technol, Grad Inst Appl Sci & Technol, Taipei 10607, Taiwan
关键词
Ferric -tannic acid complex; Post; -modification; Thin-film composite membranes; Reverse osmosis; Desalination; BORON REMOVAL; POLYAMIDE MEMBRANES; PERFORMANCE;
D O I
10.1016/j.desal.2023.116515
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Post-modifications of thin-film composite (TFC) reverse osmosis (RO) membranes have been extensively studied to improve the overall separation performance. However, new approaches have yet to be explored not only to achieve better separation efficiency, but also to reduce the overall manufacturing cost. In this work, a ferric -tannic acid (Fe-TA) complex is post-coated onto the bare TFC membranes in an in-situ stepwise process. By optimizing the concentrations of Fe3+ and TA, the resulting membrane can achieve a water permeance of 3.58 L m- 2 h-1 bar- 1 (LMH bar -1) and a salt rejection of 98.37 % at 20 bar for brackish water desalination, owing to the improved surface hydrophilicity, roughness and additional water pathways. Moreover, the optimal mem-brane also exhibits comparable performance in seawater desalination and boron removal. This new approach of modification shows potentials to be integrated into the current roll-to-roll membrane fabrication process.
引用
收藏
页数:11
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