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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

Yanhuang Wu, Yan Liu, Rongzhen Chen, Wen-Hua Zhang, Qingchun Ge

Water Res. 2019 Nov 15;165:114993.

PMID: 31442760

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 (AsIII, AsV) 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% AsV rejection, and 57.8 LMH with a 96.0% AsIII rejection when 50 ppm AsV or AsIII 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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP51698330	Disodium bis(4-chloro-3-sulfophenyl)sulfone		51698-33-0	Price

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