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Recovery of hydrochloric acid using positively-charged nanofiltration membrane with selective acid permeability and acid resistance.
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2020-01-11 , DOI: 10.1016/j.jenvman.2019.110001 Taeseon Yun 1 , Seung-Yeop Kwak 2
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2020-01-11 , DOI: 10.1016/j.jenvman.2019.110001 Taeseon Yun 1 , Seung-Yeop Kwak 2
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An acid-recovering nanofiltration (NF) membrane with both acid resistance and selective acid permeability was fabricated via a water-based coating process for the recovery of hydrochloric acid. To achieve this, a thermally cross-linked branched-polyethyleneimine (b-PEI) layer was introduced to a loose polyethersulfone NF membrane by dip-coating of b-PEI and an epoxy linker and heat treatment in a sealed oven with a high-humidity atmosphere. The resulting membrane displayed a positive surface charge with a zeta potential, and exhibited a rejection performance order of MgCl2> MgSO4> NaCl > Na2SO4 characteristic of positive-charge-separation membranes. Mg rejection and Cl permeation experiments showed that the selective permeation of hydrochloric acid was achieved with Mg rejection above 95% and Cl permeation above 70%, and this allowed the acid to be recovered by obtaining permeate at the same pH as the feed. Moreover, the NF membrane maintained selective separation performance and flow rate for a month.
中文翻译：
使用具有选择性酸渗透性和耐酸性的带正电荷的纳滤膜回收盐酸。
通过水基涂层工艺制备了同时具有耐酸性和选择性酸渗透性的耐酸纳滤膜（NF），用于回收盐酸。为此，将热交联的支化聚乙烯亚胺（b-PEI）层通过b-PEI和环氧连接剂的浸涂并在高湿度的密封烘箱中进行热处理，引入到疏松的聚醚砜NF膜中。大气层。所得膜显示出具有ζ电势的正表面电荷，并且表现出MgCl 2＞ MgSO 4＞ NaCl＞ Na 2 SO 4的正电荷分离膜的排阻性能顺序。镁的排斥和Cl的渗透实验表明，当Mg的排斥率高于95％，Cl的渗透率高于70％时，盐酸选择性渗透。并通过在与进料相同的pH值下获得渗透液来回收酸。此外，NF膜保持选择性分离性能和流速一个月。
更新日期：2020-01-13
中文翻译：
使用具有选择性酸渗透性和耐酸性的带正电荷的纳滤膜回收盐酸。
通过水基涂层工艺制备了同时具有耐酸性和选择性酸渗透性的耐酸纳滤膜（NF），用于回收盐酸。为此，将热交联的支化聚乙烯亚胺（b-PEI）层通过b-PEI和环氧连接剂的浸涂并在高湿度的密封烘箱中进行热处理，引入到疏松的聚醚砜NF膜中。大气层。所得膜显示出具有ζ电势的正表面电荷，并且表现出MgCl 2＞ MgSO 4＞ NaCl＞ Na 2 SO 4的正电荷分离膜的排阻性能顺序。镁的排斥和Cl的渗透实验表明，当Mg的排斥率高于95％，Cl的渗透率高于70％时，盐酸选择性渗透。并通过在与进料相同的pH值下获得渗透液来回收酸。此外，NF膜保持选择性分离性能和流速一个月。
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