A pH-responsive supramolecular draw solute that achieves high-performance in arsenic removal via forward osmosis.
A pH-responsive supramolecular draw solute that achieves high-performance in arsenic removal via forward osmosis.
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DOI：
10.1016/j.watres.2019.114993
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发表时间：
2019-11
期刊：
影响因子：
12.8
通讯作者：
Yanhuang Wu;Yan Liu;Rongzhen Chen;Wenhua Zhang;Qingchun Ge
中科院分区：
文献类型：
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作者：
Yanhuang Wu;Yan Liu;Rongzhen Chen;Wenhua Zhang;Qingchun Ge
通过分步合成设计了一种ph响应、电荷可切换的哌嗪衍生物1,4-双（3-丙烷磺酸钠）-哌嗪二烷基磺酸二钠(4)，并提出了通过正向渗透（FO）从水中去除砷（AsIII, AsV）的抽吸溶质。4具有多个磺酸基，在较稀浓度（0.24 M）下，渗透压高，水通量高达58.4 LMH，在类似实验条件下的水传递速率超过了大多数现有的抽吸溶质。在0.24 M条件下，化合物4的水通量为52.9 LMH， asv去除率为100%；在50 ppm AsVor asias条件下，化合物4的水通量为57.8 LMH， asv去除率为96.0%，具有最佳的除砷性能和同时回收水的效率。值得注意的是，作为水中的聚合物构型，4在FO过程中溶质损失可以忽略不计。通过酸化从其溶液中析出，可以很容易地再生用于FO中。丰富的离子基团和ph响应特性加上超分子结构使其成为处理FO废水的理想引出溶质。
A pH-responsive, charge switchable piperazine derivative, 1,4-bis(3-propane- sulphonate sodium)-piperazinediethanesulfonic acid disodium-sulfate (4), has been designed via a stepwise synthesis and proposed as a draw solute to remove arsenics (AsIII, AsV) from water through forward osmosis (FO). Having multiple sulfonic groups,4generates a high osmotic pressure and produces a water flux as high as 58.4 LMH at a dilute concentration (0.24 M), surpassing most of the existing draw solutes in water transfer rate under the similar experimental conditions. Compound4at 0.24 M yields a water flux of 52.9 LMH with a 100% AsVrejection, and 57.8 LMH with a 96.0% AsIIIrejection when 50 ppm AsVor AsIIIas the corresponding feed, manifesting the best performance in arsenic removal and concurrent water recovery efficiency. Remarkably, being a polymeric configuration in water,4has a negligible solute loss in the FO process.4can be readily regenerated for reuse in FO by precipitation from its solution through acidification. The abundance in ionic groups and the pH-responsive property coupled with a supramolecular configuration make4an ideal draw solute for FO wastewater treatment.