Tannic Acid/Fe3+ Nanoscaffold for Interfacial Polymerization: Toward Enhanced Nanofiltration Performance

作者：Yang, Zhe; Zhou, Zhi-wen; Guo, Hao; Yao, Zhikan; Ma, Xiao-hua; Song, Xiaoxiao; Feng, Shien-Ping; Tang, Chuyang Y.^*

来源：Environmental Science & Technology, 2018, 52(16): 9341-9349.

DOI：10.1021/acs.est.8b02425

• THIN-FILM COMPOSITE
• HOLLOW-FIBER MEMBRANES
• REVERSE-OSMOSIS MEMBRANES
• MIXED DIAMINE MONOMERS
• HIGH-FLUX
• PHYSIOCHEMICAL PROPERTIES
• CONCENTRATION POLARIZATION
• NANOCOMPOSITE MEMBRANES
• SEPARATION PERFORMANCE
• COORDINATION-COMPLEXES

Conventional thin-film composite (TFC) membranes suffer from the trade-off relationship between permeability and selectivity, known as the "upper bound". In this work, we report a high performance thin-film composite membrane prepared on a tannic acid (TA)-Fe nanoscaffold (TFCn) to overcome such upper bound. Specifically, a TA-Fe nanoscaffold was first coated onto a polysulfone substrate, followed by performing an interfacial polymerization reaction between trimesoyl chloride (TMC) and piperazine (PIP). The TA-Fe nanoscaffold enhanced the uptake of amine monomers and provided a platform for their controlled release. The smaller surface pore size of the TA-Fe coated substrate further eliminated the intrusion of polyamide into the substrate pores. The resulting membrane TFCn showed a water permeability of 19.6 +/- 0.5 L m(2-) h(-1) bar(-1), which was an order of magnitude higher than that of control TFC membrane (2.2 +/- 0.3 L m(-2) h(-1) bar(-1)). The formation of a more order polyamide rejection layer also significantly enhanced salt rejection (e.g., NaCl, MgCl2, Na2SO4, and MgSO4) and divalent to monovalent ion selectivity (e.g., NaCl/MgSO4). Compared to conventional TFC nanofiltration membranes, the novel TFCn membrane successfully overcame the longstanding permeability and selectivity trade-off. The current work paves a new avenue for fabricating high performance TFC membranes.

• 出版日期2018-8-21
• 单位华东理工大学; 浙江工业大学