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 (R2) 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.
Highlights
Ionic liquids (ILs) are defined as inorganic/organic salts in the liquid state at the temperature below 100 °C1
Surface morphology and the porous structure of the obtained polymer were investigated by scanning electron microscopy (SEM) and Transmission electron microscopy (TEM)
The new absorption peaks of C=O stretching band at 1726 cm−1, C=C stretching bands at 1449 cm−1 and 1639 cm−1, C=N stretching at 1294 cm−1 and C–O–C stretching band 1165 cm−1 displayed that porous ionic liquid polymer was successfully prepared using [AMIM][Br] as monomer and ethylene glycol dimethyl acrylate (EGDMA) as cross linker
Summary
The peak at 626 cm−1 is due to Fe–O characteristic band and verified the synthesis of magnetic porous ionic liquid polymer. The size of nanoparticle in the crystal structure of the synthesized polymer was estimated using Debye-Scherrer formula to be 12 nm at 2θ = 35–36° (main peak) for Fe3O4 and 6 nm at 2θ = 14–16° (main peak) for porous ionic liquid. Value, imidazolium groups of the porous IL become more active and can participate in an anion exchange procedure that results in higher absorption of the nitrite ions. At highest pH, the competition between hydroxide and target anion for the same sorption site of porous IL, results in decreasing extraction efficiency. 10 mg (±0.1) is the best mass to quantitative sorption of the anions This is caused by the high surface area to volume ratio of porous structures. Results indicate that when the sample volume is less than 150 mL, nitrite ions were quantitatively recovered
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