Query: PVDF  Magnetic Ionic Liquid

title: Solid phase extraction of chlorophenols in seawater using a magnetic ionic liquid molecularly imprinted polymer with incorporated silicon dioxide as a sorbent.
abstract: A type of magnetic ionic liquid based molecularly imprinted polymer coated on SiO2 (Fe3O4@SiO2@IL MIPs) was prepared with 1 vinyl 3 ethylimidazole ionic liquid as functional monomer, and 1,4 butane 3,3' bis 1 ethylimidazole ionic liquid as cross linker, 4 Chlorophenol as template was successfully applied as a selective adsorbent for selective extraction of 5 chlorophenols in seawater samples by using the magnetic solid phase extraction (MSPE) method. 11 types of Fe3O4@SiO2@IL MIPs were synthesized and investigated for their different compositions of functional monomer (such as [C2min][Br] [C2min][BF4] [C2min][PF6] acrylamide, methacrylic acid and 4 vinyl pyridine) and cross linker (such as [C4min2][Br] [C4min2][BF4] [C4min2][PF6] divinylbenzene, and ethylene glycol dimethacrylate) respectively. The [C2min][BF4] and [C4min2][PF6] based Fe3O4@SiO2@IL MIP with the highest extraction efficiencies was applied to the optimization experiment of MSPE process (including extraction time, adsorbent mass and desorption solvents) Good linearity was obtained with correlation coefficients (R2) over 0.9990 and the relative standard deviations for the intra day and inter day determination were less than 3.10% with the extraction recoveries ranged from 85.0% to 98.4% The results indicated that the proposed Fe3O4@SiO2@IL MIPs possesses great identification and adsorption properties, and could be used as a good sorbent for selective extraction of CPs in environment waters.

title: Ultrasound assisted surfactant enhanced emulsification microextraction using a magnetic ionic liquid coupled with micro solid phase extraction for the determination of cadmium and lead in edible vegetable oils.
abstract: A novel ultrasound assisted surfactant enhanced emulsification microextraction (UASEME) using a magnetic ionic liquid (MIL) coupled with micro solid phase extraction was developed for the preconcentration of cadmium and lead in edible vegetable oils prior to analysis by graphite furnace atomic absorption spectrometry. MIL [C4mim] [FeCl4] was used as the extractant, non ionic surfactant Triton X 100 as the emulsifier and Fe3O4 nanoparticles as the sorbent, while ultrasound was applied to assist the dispersion of the extractant and accelerate the mass transfer process. By mixing Fe3O4 nanoparticles with the MIL after UASEME, the phase separation time was shortened and the separation can be simplified by applying an external magnetic field. Under the optimized conditions, the proposed method was validated and the results demonstrated that the method can produce satisfactory linearity, sensitivity, reproducibility and recovery for the analytes. Finally, the method was successfully applied for the determination of Cd and Pb in edible vegetable oil samples.

title: Enhanced magnetic ionic liquid based dispersive liquid liquid microextraction of triazines and sulfonamides through a one pot, pH modulated approach.
abstract: In this study, an enhanced variant of magnetic ionic liquid (MIL) based dispersive liquid liquid microextraction is put forward. The procedure combines a water insoluble solid support and the [P66614+[Dy(III)(hfacac)4 MIL, in a one pot, pH modulated procedure for microextraction of triazines (TZs) and sulfonamides (SAs) The solid supporting material was mixed with the MIL to overcome difficulties concerning the weighing of MIL and to control the uniform dispersion of the MIL, rendering the whole extraction procedure more reproducible. The pH modulation during extraction step makes possible the one pot extraction of SAs and TZs, from a single sample, in 15 min. Overall, the new analytical method developed enjoys the benefits of sensitivity (limits of quantification: 0.034 0.091 mg L 1) and precision (relative standard deviation: 5.2 8.1% while good recoveries (i.e. 89 101% were achieved from lake water and effluent from a municipal wastewater treatment plant. Owing to all of the above, the new procedure can be used to determine the concentrations of SAs and TZs at levels below the maximum residue limits.

title: Magnetic ionic liquid based dispersive liquid liquid microextraction technique for preconcentration and ultra trace determination of Cd in honey
abstract: AbstractA simple, highly efficient, batch, and centrifuge less dispersive liquid liquid microextraction method based on a magnetic ionic liquid (MIL DLLME) and electrothermal atomic absorption spectrometry (ETAAS) detection was developed for ultra trace Cd determination in honey. Initially, Cd(II) was chelated with ammonium diethyldithiophosphate (DDTP) at pH 0.5 followed by its extraction with the MIL trihexyl(tetradecyl)phosphonium tetrachloroferrate(III) [P6,6,6,14]FeCl4) and acetonitrile as dispersant. The MIL phase containing the analyte was separated from the aqueous phase using only a magnet. A back extraction procedure was applied to recover Cd from the MIL phase using diluted HNO3 and this solution was directly injected into the graphite furnace of ETAAS instrument. An extraction efficiency of 93% and a sensitivity enhancement factor of 112 were obtained under optimal experimental conditions. The detection limit (LOD) was 0.4 ng L 1 Cd, while the relative standard deviation (RSD) was 3.8% (at 2 mg L 1 Cd and n 10) calculated from the peak height of absorbance signals. This work reports the first application of the MIL [P6,6,6,14]FeCl4 along with the DLLME technique for the successful determination of Cd at trace levels in different honey samples. Graphical abstractPreconcentration of ultratraces of Cd in honey using a magnetic ionic liquid and dispersive liquid liquid microextraction technique.

title: Creating magnetic ionic liquid molecularly imprinted polymers for selective extraction of lysozyme
abstract: A novel magnetic (Fe3O4) surface molecularly imprinted polymer (MIP) based on ionic liquid (IL) (Fe3O4@VTEO@IL MIPs) was prepared for the selective extraction of lysozyme (Lys) As the functional monomer of the MIPs, an imidazolium based IL with vinyl groups was prepared. It can provide multiple interactions with template molecules. The amount of IL was optimized (200 mg) Fourier transform infrared spectrometry (FT IR) transmission electron microscopy (TEM) dynamic light scattering (DLS) thermogravimetric analysis (TGA) and a vibrating sample magnetometer (VSM) were used to characterize the MIP. The results indicate the successful formation of an imprinting polymer layer. The concentration of Lys in the supernatant was determined by UV vis spectrophotometry at a wavelength of 280 nm. The maximum adsorption capability of the MIP is 213.7 mg g 1 and the imprinting factor (IF) is 2.02. It took 2.5 h for the MIP to attain adsorption equilibrium. The structure of the protein was evaluated using circular dichroism (CD) spectra and UV visible spectra. The adsorption performance was further investigated in detail by selective adsorption experiments, competitive rebinding tests, and reusability and stability experiments. Furthermore, it was utilized to separate the template protein from a mixture of proteins and real samples successfully because of the high adsorption capacity for Lys.

title: Magnetic mesoporous nanospheres supported phosphomolybdate based ionic liquid for aerobic oxidative desulfurization of fuel.
abstract: Phosphomolybdate based ionic liquid (C8H17)3NCH3]3PMo12O40 was prepared and supported on a magnetic mesoporous silica (g Fe2O3@SiO2@mSiO2) to obtain a magnetic mesoporous catalyst. The morphology and components of the catalyst were characterized by FT IR, XRD, XPS, SEM, TEM, nitrogen adsorption desorption isotherms, and VSM. With air as oxidant, the catalyst showed perfect desulfurization performance in oxidation of dibenzothiophene (DBT) The removal of DBT from model oil could reach 100% within 5 h at 120 degC. After reaction, the catalyst could be separated by a magnet and recycled at least four times without obvious decrease in the catalytic performance.

title: Conduction mechanism in polymeric membranes based on PEO or PVdF HFP and containing a piperidinium ionic liquid
abstract: Two types of polymer electrolyte membranes were prepared using poly(ethylene oxide) (PEO) and poly(vinylidene difluoride co hexafluoropropylene) (PVdF HFP) with different amounts of the ionic liquid N methyl N propylpiperidinium bis(trifluoromethane sulfonyl) imide [PP13][TFSI] added. The results from differential scanning calorimetry and conductivity measurements show that in the case of PVdF HFP membranes the glass transition temperature T g decreases and the room temperature ionic conductivity increases with increasing content of the ionic liquid (up to 60 wt. However, in the case of PEO based membranes Tg is less significantly affected and the room temperature ionic conductivity increases only up to 30 wt. of ionic liquid, beyond which a steady value of about 5.10( 5) S/cm is reached. The results from Raman spectroscopy show that the characteristic vibrational mode of the TFSI anion at similar to 742 cm( 1) is weakly affected in the membranes prepared from PVdF HFP, whereas for those based on PEO it has a clearer composition dependence. These results suggest ion ion and ion polymer interactions of different nature, which together with the different nanomorphologies adopted by PEO and PVdF HFP, as revealed by X ray scattering, give rise to different composition dependences of the macroscopically measured ionic conductivity.

title: Magnetic poly(b cyclodextrin ionic liquid) nanocomposites for micro solid phase extraction of selected polycyclic aromatic hydrocarbons in rice samples prior to GC FID analysis.
abstract: Poly(b cyclodextrin functionalized ionic liquid) immobilized magnetic nanoparticles (Fe3O4@bCD Vinyl TDI) as sorbent in magnetic u SPE was developed for the determination of selected polycyclic aromatic hydrocarbons (PAHs) in rice samples coupled with gas chromatographic flame ionization detector (GC FID) The nanocomposite was characterized by various tools and significant parameters that affected the extraction efficiency of PAHs were investigated. The calibration curves were linear for the concentration ranging between 0.1 and 500 mg kg 1 with correlation determinations (R2) from 0.9970 to 0.9982 for all analytes. Detection limits ranged at 0.01 0.18 mg kg 1 in real matrix. The RSD values ranged at 2.95% 5.34% (intra day) and 4.37% 7.05% (inter day) precision for six varied days. The sorbents showed satisfactory reproducibility in 2.9% to 9.9% range and acceptable recovery values at 80.4% 112.4% were obtained for the real sample analysis. The optimized method was successfully applied to access content safety of selected PAHs for 24 kinds of commercial rice available in Malaysia.

title: Development of strain sensor using conductive poly(vinylidene fluoride) (PVDF) nanocomposite membrane reinforced with ionic liquid (IL) carbon nanofiber (CNF)
abstract: High sensitivity and good mechanical strength are required for conductive polymer nano composites (CPNC) based flexible strain sensors. Here we have developed CPNC membranes using PVDF as a base polymer along with carbon nanofiber (CNF) and ionic liquid (IL) as conducting fillers exhibiting good thermal stability, high sensing voltage, and mechanical performance for strain sensors. The IL infiltration in PVDF and CNFs composition resulted in micro porous morphology that exhibited stretchability (maximum elongation 5.8 mm) and a high gauge factor (4.08) (property of a good strain sensor) Further, infiltration of IL in PVDF/CNF membrane brings microstructural changes (a to b phase) of PVDF and provides an electrolyte mixture of CNF and IL for the facile flow of ions through it. The CNFs in CPNC having IL helped in maintaining the crack initiation during strain. Hence, the deformed CNFs across the pores or within the PVDF act as an interlinking agent and provides an electrical conduction pathway in the shrink lattice of the composite.

title: Highly selective adsorption of hydroquinone by hydroxyethyl cellulose functionalized with magnetic/ionic liquid.
abstract: Magnetic hydroxyethyl cellulose/ionic liquid (MHEC/IL) materials were fabricated through a facile and fast process and their application as excellent adsorbents for hydroquinone was also demonstrated. The thermal stability, chemical structure and magnetic property of the MHEC/IL were characterized by the Scanning electron microscope (SEM) Transmission Electron Microscope (TEM) Fourier transform infrared spectrometer (FT IR) and X ray diffraction (XRD) respectively. The adsorbents were used for the removal of hydroquinone from simulated wastewater with a fast solid liquid separation in the presence of external magnetic field. The influence of various analytical parameters on the adsorption of hydroquinone such as pH, contact time and initial ion concentration were studied in detail. The results showed that the maximum adsorption capacity was 335.68mgg 1, observed at pH 5 and temperature 30degC. Equilibrium adsorption was achieved within 30min. The kinetic data, obtained at the optimum pH 5, could be fitted with a pseudo second order equation. Adsorption process could be well described by Freundlich adsorption isotherms. The obtained results indicated that the impregnation of the room temperature IL significantly enhances the removal efficiency of hydroquinone. The MHEC/IL may be suitable materials in phenols pollution cleanup if they are synthesized in largescale and at low price in near future.