Novel Ionic Grafts That Enhance Arsenic Removal via Forward Osmosis.
Novel Ionic Grafts That Enhance Arsenic Removal via Forward Osmosis.
复制标题
DOI：
10.1021/acsami.9b03991
复制
发表时间：
2019-04
影响因子：
9.5
通讯作者：
Qiaoling Yang;Cher Hon Lau;Qingchun Ge
中科院分区：
文献类型：
--
作者：
Qiaoling Yang;Cher Hon Lau;Qingchun Ge
目前的正向渗透（FO）膜由于砷选择性差而不适合从水中去除砷。在这项研究中，我们设计和合成了一系列新型的咪唑基离子液体通过一步季铵化反应，并接枝这些新的化合物到传统的薄膜复合FO膜处理含砷的水。新开发的离子膜含有接枝有羧酸/羧酸盐或磺酸盐基团的官能化选择性聚酰胺层，其显著增强膜亲水性，从而增强FO水渗透。用1-乙磺酸钠-3-（3-氨丙基）咪唑溴化盐（NH2-IM-（CH2）2-SO3Na）改性的离子膜比未改性的膜具有更高的水回收效率。在FO模式下，当1000 ppm砷（HAsO 42-）作为进料，稀NaCl溶液（0.5 M）作为汲取溶液时，该离子膜在FO除砷中实现了优异的性能，水通量为11.0 LMH，截留率高于99.5%。在这项工作中开发的离子膜促进FO处理含砷的水，同时证明其优于现有技术，更有效地去除砷。
Current forward osmosis (FO) membranes are unsuitable for arsenic removal from water because of their poor arsenic selectivity. In this study, we designed and synthesized a series of novel imidazolium-based ionic liquids via one-step quaternization reactions and grafted these novel compounds on to conventional thin-film composite FO membranes for treatment of arsenic-containing water. The newly developed ionic membranes contained a functionalized selective polyamide layer grafted with either carboxylic acid/carboxylate or sulfonate groups that drastically enhanced membrane hydrophilicity and thus FO water permeation. Ionic membranes modified with sodium 1-ethanesulfonate-3-(3-aminopropyl) imidazolium bromide (NH2-IM-(CH2)2-SO3Na) outperformed pristine membranes with higher water recovery efficiency. Exceptional performance was achieved with this ionic membrane in FO arsenic removal with a water flux of 11.0 LMH and a rejection higher than 99.5% when 1000 ppm arsenic (HAsO42-) as the feed with a dilute NaCl solution (0.5 M) as the draw solution under the FO mode. Ionic membranes developed in this work facilitated FO for the treatment of arsenic-containing water while demonstrating its superiority over incumbent technologies with more efficient arsenic removal.