Abstract
The hydrophobic poly(ionic liquid) of poly(3-ethyl-1-vinylimidazolium bis(trifluoromethanesulfonyl)imide) (PVI-TFSI) containing imidazolium cations and bis(trifluoromethanesulfonyl)imide anions was synthesized for the separation of methyl blue and chromium ions [Cr(VI)] from water. The adsorption of methyl blue and Cr(VI) in PVI-TSFI/water system reached equilibrium stage within 60 min and 12 h, and the maximum adsorbed percentage for methyl blue and Cr(VI) was 97.6% and 98.0%, respectively. The adsorption regi me of either methyl blue or Cr(VI) for PVI-TFSI was in correspondence with the Langmuir adsorption model. The maximum adsorption capacity of PVI-TFSI for methyl blue and Cr(VI) was determined as 476.2 and 17.9 mg/g, respectively. The hydrophobic poly(ionic liquid) with a remarkable adsorbent capacity of methyl blue and Cr(VI) can be conveniently synthesized and shows potential in water treatment for the effective separation of organic dyes or heavy metal ions.
Highlights
The removal of industrial pollutants from wastewater has attracted considerable attention in recent years [1,2]
We report a convenient synthesis of hydrophobic poly(ionic liquid)s (PILs) of poly(3-ethyl-1-vinylimidazolium bis(trifluoromethanesulfonyl)imide) (PVI-TFSI) via free radical polymerization
The anion exchange process was conducted by adding excessive lithium bis(trifluoromethylsulfonyl)imide into a poly(3-ethyl-1-vinylimidazolium bromide) solution to ensure the hydrophobicity of PVI-TFSI in a bulk state
Summary
The removal of industrial pollutants from wastewater has attracted considerable attention in recent years [1,2]. The hydrophobicity of PILs provides the possibility to absorb the heavy metal ions or organic pollutants from water by a convenient heterogeneous phase regime. The usage of PILs as adsorbents to separate and remove methyl blue from water by a heterogeneous phase regime has been seldom reported up to date. In this contribution, we report a convenient synthesis of hydrophobic PIL of poly(3-ethyl-1-vinylimidazolium bis(trifluoromethanesulfonyl)imide) (PVI-TFSI) via free radical polymerization. The as-synthesized PVI-TFSI was used as adsorbent for the separation and removal of heavy-metal ions of Cr(VI) and methyl blue from their water solutions
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