Porous ionic liquid polymer: A reusable adsorbent with broad operating pH range for speciation of nitrate and nitrite

Abstract

Ionic liquids (ILs) are a class of fluids with unique physicochemical properties employing polymeric substances emerging new materials. Solidification of ILs into porous materials generates porous ionic liquid polymers that combine the unique characteristics of ILs with common porous materials and polymers. In this study, it’s the first time the porous ionic liquid polymer was chosen as a sorbent for extraction and speciation of nitrite and nitrate. Porous IL was prepared through polymerization of 1-allyl-3-methylimidazolium bromide monomers in the presence of azobisisobutyronitrile (AIBN) and crosslinking of ethylene glycol dimethyl acrylate (EGDMA). Parameters affecting the adsorbent performance were optimized. Under the optimal conditions, correlation coefficient (R 2 ) was 0.9996 and LOD was 0.1 µg L −1 . This method presented the linearity in the concentration range between 0.1–100 µg L −1 and the relative standard deviation was 3.2%. Finally, the adsorption behavior of the obtained sorbent for nitrate and nitrite determination in various real samples was evaluated. The result indicates that the porous ionic liquid polymer showed high adsorption capacity (233 mg g −1 ). The convenient preparation of the porous ionic liquid material, as well as high adsorption capacity for anionic pollutants predicted its broad application potential in anion removal materials.

Poly(ionic liquid)s: an emerging platform for green chemistry

“…Under optimal conditions, a maximum adsorption capacity (233 mg g −1 ) was achieved by the porous PIL. 154 Taking advantage of immersion grinding and in situ polymerization techniques, Huang et al prepared carboxyl-functionalized imidazolium-based PIL inside MIL-101 (P[C 4 (VIM) 2 ] Cl 2 @MIL-101). The resultant P[C 4 (VIM) 2 ]Cl 2 @MIL-101 showed excellent adsorption performance toward ReO 4 − (Fig.…”

Synthesis of a polymeric nanocomposite based on magnetic sepiolite functionalized with an ionic liquid for the adsorption of aromatic pollutants from aqueous solution

“…ILs enjoy excellent selectivity and adsorption capacity due to the presence of some interactions (π-π stacking, ion exchange, and electrostatic interactions). 44,45 Carbon nanotubes (CNTs) functionalized with allyl triphenyl phosphonium bromide (ATPPB) could be used as an adsorbent for Hg 2+ removal. 46 In the present study, natural and cheap SP powder has been used as a support and activated with hydrochloric acid.…”