A pH-responsive supramolecular draw solute that achieves high-performance in arsenic removal via forward osmosis.

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ID: 17571
2019
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Abstract
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 (As, As) from water through forward osmosis (FO). Having multiple sulfonic groups, 4 generates 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. Compound 4 at 0.24 M yields a water flux of 52.9 LMH with a 100% As rejection, and 57.8 LMH with a 96.0% As rejection when 50 ppm As or As as the corresponding feed, manifesting the best performance in arsenic removal and concurrent water recovery efficiency. Remarkably, being a polymeric configuration in water, 4 has a negligible solute loss in the FO process. 4 can 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 make 4 an ideal draw solute for FO wastewater treatment.
Reference Key
wu2019awater Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Wu, Yanhuang;Liu, Yan;Chen, Rongzhen;Zhang, Wen-Hua;Ge, Qingchun;
Journal Water research
Year 2019
DOI
S0043-1354(19)30767-5
URL
Keywords Keywords not found

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