Department of Civil Engineering, The University of Hong Kong , Pokfulam, Hong Kong.
Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Chemical Engineering Research Center, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, P. R. China.
Environ Sci Technol. 2017 Nov 7;51(21):12638-12643. doi: 10.1021/acs.est.7b03478. Epub 2017 Oct 19.
We report a fast, simple, and green coating method using the coordination complex of tannic acid (TA) and ferric ion (Fe) to enhance the removal of trace organic contaminants (TrOCs) by polyamide membranes. The entire coating process can be completed in less than 2 min; quartz crystal microbalance characterization revealed that a TA-Fe thin film formed in merely 10-20 s. Coating this TA-Fe thin film on a commercial nanofiltration membrane (NF270) reduced its effective pore size from 0.44 to 0.40 nm. The TA-Fe-coated NF270 showed significantly increased rejection of both NaCl and trace organic contaminants. In comparison with the more-time-consuming polydopamine coating (e.g., 0.5 h), the TA-Fe coating presented greater resistance to TrOC permeation (i.e., lower permeability of TrOCs). The advantages of the fast coating process, greatly improved rejection performance, and use of green accessible materials make TA-Fe a highly promising coating material for large-scale applications.
我们报告了一种快速、简单、绿色的涂层方法，使用单宁酸（TA）和铁离子（Fe）的配位复合物来增强聚酰胺膜对痕量有机污染物（TrOCs）的去除。整个涂层过程可以在不到 2 分钟内完成；石英晶体微天平的特性研究表明，仅需 10-20 秒即可形成 TA-Fe 薄膜。在商业纳滤膜（NF270）上涂覆这种 TA-Fe 薄膜，可将其有效孔径从 0.44 纳米减小至 0.40 纳米。涂覆有 TA-Fe 的 NF270 对 NaCl 和痕量有机污染物的截留率显著提高。与更耗时的聚多巴胺涂层（例如 0.5 小时）相比，TA-Fe 涂层对 TrOC 渗透的阻力更大（即 TrOC 的渗透性更低）。快速涂层过程、大大提高的截留性能以及使用环保易得材料的优势，使得 TA-Fe 成为大规模应用的极具前景的涂层材料。
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