| As a "green" solvent, Ionic liquids can replace of the large amounts of traditional volatile organic solvents, which widely be used in the extraction and adsorption separation, also be called the new functional materials. Poly ionic liquid had the same functional group of ionic liquids. It not only retained designability, but also easy regulation of the resistance. It appeared polymer solid at room temperature while the ionic liquid appeared liquid. The liquid polymer had the workability which made poly ionic liquid to become new separation materials.A method for the determination of brodifacoum in urine by liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) and two-phase dispersive liquid-liquid microextraction with hydrophilic ionic liquid [C4mim][BF4] was developed. A two-phase system of an ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([C4mim][BF4]) and NaH2PO4 was used to extract the brodifacoum from the urine samples. The extraction parameters, including sample concentration, volume of ionic liquid, solution pH, type of inorganic salts and concentration of NaH2PO4, et al., had been investigated in details. After the extraction, the separation was performed on a XDB C18 column by using the mobile phase of methanol and 0.2% acetic acid solution (85+15, V/V). Detection was carried out by LC-MS/MS using a negative electrospray ionization interface in the multi-reaction monitoring (MRM) mode. Calibration curves were linear within the range of 0.02?2.0 ?g·L-1 with the correlation coefficients of more than 0.999, and the limit of quantification was 0.015 ?g·L-1 . The extraction recoveries were between 86.8%-92.5%, and the intra-day RSDs were between 3.3%?8.1%, and the inter-day RSDs were between 6.2%?9.7%. The developed method is simple, accurate and good specificity for the satisfactory determination of trace brodifacoum in urine.A novel amphiphilic polymeric ionic liquid membrane containing a hydrophilic bromide anion and a hydrophobic carbonyl group was synthesized using the ionic liquid 1-butyl-3-vinylimidazolium bromide (BVImBr) and the methylmethacrylate (MMA) as monomers. The prepared MMA-BVImBr membrane was characterized by a scanning electron microscope and an Infrared spectrum instrument. The extraction parameters, including concentration of NaCl, solution pH, temperature and, et al., had been investigated in details. The results of solid-phase mico-extraction (SPMM) membrane experiments showed that the adsorption capacity of membrane was about 0.76 ?g·L-1 for aniline. Based on this, a sensitive method for the determination of trace aniline, as a degradation product of azo dye Orange G under sonication, was developed by liquid chromatography-tandem mass spectrometry (LC-MS/MS). The calibration curve showed good linearity ranging from 0.5?g·L-1 to 10.0 ?g·L-1 with a correlation coefficient value of 0.9998. The limit of quantification was 0.5 ?g·L-1 . The recoveries ranged from 90.6% to 96.1%. The intra-day and inter-day relative standard deviations were less than 8.3% and 10.9%. The developed SPMM-LC-MS/MS method was used successfully for preconcentration of trace aniline produced during the sonication of Orange G solution.The spherical Fe3O4 nanoparticles were synthesized by solvothermal method. The reaction time and the amount of ferric chloride hexahydrate had been investigated in details to find out the influence of the synthesis of nanoparticles with the SEM, TEM, FT-IR, VSM characterization analysis. Established a method for the synthesis of a magnetic ionic liquid polyethylene mainly of Fe3O4 nanoparticles coated with SiO2, to the surface with hydroxyl groups, then subjected to the silylation reaction, so that the surface with an amino group, and finally reacted with the ionic liquid generate magnetic poly ionic liquid complex. The prepared magnetic composite materials had four kinds including a-Fe3O4-poly-BVTm-Br, b-Fe3O4-poly-BVIm-Br, a-Fe3O4-poly-MEBIm-Br and b-Fe3O4-poly-MEBIm-Br. It indicated that the method was successfully to synthesize the magnetic polymer through the SEM, TEM, FT-IR, XRD, VSM characterization techniques. The initial concentration of Orange G, pH and reaction temperature were studied which affected the adsorption rate and established the optimal conditions for adsorption. The adsorption experiments about different magnetic poly ionic liquid to adsorb OG solution, showed that the adsorption rate increasing with OG initial concentration decreasing. Moreover, the adsorption rate of b-Fe3O4-poly-MEBIm-Br was slightly higher than b-Fe3O4-poly-BVIm-Br, and better stability. Under desorpting of composite materials by methanol, the extraction recovery up to 90 percent. After repeated adsorption and desorption, the extraction recovery was no significant change, and incarnated good stability.Proposed a method for the preparation of graphene polyionic liquids, primarily through the oxygen-containing functional group from the graphene oxide and the double bond of the imidazole ring of ionic liquids to the chemical polymerization. Hydrazine hydrate was added as a strong reducing agent to reduce graphene oxide during the synthesis process. It indicated that the method was successfully to synthesize the graphene poly ionic liquid through the SEM, TEM, FT-IR, XRD characterization techniques. The adsorption experiments about different graphene poly ionic liquid to adsorb OG solution, showed that the adsorption rate increasing with OG initial concentration decreasing. Moreover, the adsorption rate of rGO-poly-MEBIm-Br was slightly higher than rGO-poly-BVIm-Br, and better stability. Attributed to the former double bond was farther from the imidazole ring, more stable chemical structure which was conducive to absorption. |
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