"Living" electrospray - A controllable polydopamine nano-coating strategy with zero liquid discharge for separation
"Living" electrospray - A controllable polydopamine nano-coating strategy with zero liquid discharge for separation
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“活的”电喷雾——零液体排放分离的可控聚多巴胺纳米涂层策略
DOI：
10.1016/j.memsci.2019.05.071
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发表时间：
2019
影响因子：
9.5
通讯作者：
Liu Fu
中科院分区：
文献类型：
--
作者：
Wang Jianqiang;Pei Xiaoqiang;Liu Ge;Han Qiu;Yang Simin;Liu Fu
聚多巴胺(PDA)表面涂层近年来得到了广泛的研究，尤其是用来提高膜的分离性能。然而，由于时间长、涂膜控制困难、废水排放困难，限制了它们在实际生产中的应用。我们报告了一种简单的策略，“活的”电喷雾，以解决这些限制。电喷雾过程有利于多巴胺溶液微/纳米反应性液滴的分裂和分散，从而通过增加与氧气的接触表面积(比普通1.0 毫升溶液高4个数量级)和限制效应来促进聚乙二醇胺的聚合。通过控制电喷时间，可以简单地控制电喷层的光滑形貌，该层由具有纳米孔和厚度的蠕虫状聚集体组成。制备的EPDA-10膜对硼酸和有机染料的截留率分别为87.9%和98.0%。此外，对染料和盐类的选择性较高，因为对盐类的截留率较低(Na2SO4的截留率为6.0 ± 1.8%，氯化钠的截留率为1.8 ± 0.7%)。这种“活”的电喷雾技术为通过零液体排放过程可控地制备高性能分离膜提供了一种很有前途的技术。
Polydopamine (PDA) surface coating has been widely studied in recent years, especially for enhancing the separation performance of membranes. However, their practical application for scale-up production was limited by time consuming, difficulty of coating control and discharge of wastewaters. We report a facile strategy, “living” electrospray, for addressing these limitations. The electrospray process is favorable for the fission and dispersion of micro/nano reactive droplets of dopamine solution, which therefore facilitates the PDA polymerization through enhanced contact surface area to oxygen (four orders of magnitude higher than common 1.0 mL solution) and confined effect. The smooth morphology of the electrospray PDA layer composed of worm-like PDA aggregates with nanopores and thickness can be simply controlled by manipulation of the electrospray time. The fabricated ePDA-10 membrane showed excellent rejection performance for boric acid (87.9%) and organic dyes (98.0%). In addition, the selectivity towards dyes and salts are quite high, as the rejection for salts are relatively low (6.0 ± 1.8% for Na2SO4and 1.8 ± 0.7% for NaCl). The “living” electrospray offers a promising technology for controllably fabricating high performance separation membrane via a zero liquid discharge process.