Issue 13, 2019, Issue in Progress

Silver-modified porous polystyrene sulfonate derived from Pickering high internal phase emulsions for capturing lithium-ion

Abstract

Adsorption separation based on porous polystyrene sulfonate is an important method of extracting lithium ion (Li+). In this work, silver-modified porous polystyrene sulfonate (PHIPEs-SS-Ag) derived from Pickering high internal phase emulsions was fabricated for the selective binding of Li+. PHIPEs-SS-Ag possessed porous polymer matrix, sufficient sulfonic acid functional groups, and uniformly immobilized silver particles, which were beneficial for improving mass transfer, binding amount and antifouling performance. In batch mode experiments, the adsorption capacity reached a maximum value (i.e. 14.09 mg g−1) under alkaline conditions, and the adsorption mechanism between PHIPEs-SS-Ag and Li+ was electrostatic attraction. PHIPEs-SS-Ag exhibited fast binding kinetics at 25 °C (i.e. 300 min), and the maximum monolayer adsorption amount from the Langmuir model for Li+ are 59.85 mg g−1, 35.06 mg g−1, and 27.09 mg g−1 at 15 °C, 25 °C, and 35 °C, respectively. Moreover, PHIPEs-SS-Ag displayed excellent selectivity for Li+ in the presence of K+, Mg2+, and Na+, and maintained 80.71% of the initial adsorption capacity after seven sequential cycles of adsorption–regeneration. Therefore, this work opened up a universal route for the development of composite adsorbents for the specific separation of Li+.

Graphical abstract: Silver-modified porous polystyrene sulfonate derived from Pickering high internal phase emulsions for capturing lithium-ion

Article information

Article type
Paper
Submitted
27 Nov 2018
Accepted
23 Jan 2019
First published
05 Mar 2019
This article is Open Access
Creative Commons BY license

RSC Adv., 2019,9, 7228-7237

Silver-modified porous polystyrene sulfonate derived from Pickering high internal phase emulsions for capturing lithium-ion

X. Wang, X. Chen, Y. Peng and J. Pan, RSC Adv., 2019, 9, 7228 DOI: 10.1039/C8RA09740B

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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