4.7 Article

2-(Allyloxy) methylol-12-crown-4 ether functionalized polymer brushes from porous PolyHIPE using UV-initiated surface polymerization for recognition and recovery of lithium

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 380, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122386

Keywords

Macroporous PolyHIPE; Easy-to-access; Polymer brushes; Selective recognition and adsorption; Lithium ions

Funding

  1. National Natural Science Foundation of China [21822807, 21576120, U1607125]
  2. Natural Science Foundation of Jiangsu Province [BK20160491, BK20170323, BK20170523]
  3. National Postdoctoral Science Foundation of China [2016M600374, 2017T100341]
  4. Six Talent Peaks Project in Jiangsu Province [JNHB-016]
  5. Environment Monitoring Foundation of Jiangsu Province [1406]

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It is highly desirable to develop an efficient adsorbent with large capacity, high selectivity and fast kinetics to recovery virtually inexhaustible lithium ion (Li+) resources from salt lake brine. In this work, 2-(allyloxy) methylol-12-crown-4 ether (2AM12C4) functionalized polymer brushes (PVBC-g-PCE) from macroporous polymeric high internal-phase emulsion (PolyHIPE) using UV-initiated surface polymerization are synthesized for selectively recovery of Li+. PVBC-g-PCE possesses the advantages of strong physical strength, high density of accessible binding sites, and the size of highly permeatable voids and interconnecting pores is about 8.0-18 mu m and 3.3-4.8 mu m, respectively, which is a favorable adsorbent for specific capture Li+. PVBC-g-PCE has a maximum capacity at pH 6.0, and the pH-dependent adsorption amount suggests the grafted polymer brushes of 2AM12C4 is the driving force to enhance binding performance. PVBC-g-PCE has a fast adsorption equilibrium within 45 min, and the kinetic results are well-described by the pseudo-second-order model, indicating the specific host-guest interaction between functionalized 2AM12C4 and Li+ is the main adsorption mechanism. Moreover, the maximum monolayer binding amount of PVBC-g-PCE is 4.43 mg g(-1), and the strong affinity in the presence of four kinds of interfering ions (i.e. Na+, K+, Mg2+, and Ca2+) is also observed, which can also be proved by the high relative selectivity separation coefficient (alpha(r)) between 3.16 and 7.98. It is expected that this PVBC-g-PCE with abundant easy-to-access specific recognition sites can be applied as a promising adsorbent for effective separation of Li+.

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