| In recent years, materials science has propelled to the research forefront. Ionic liquid has played an important role in the development and application of materials science with its unique properties. This paper prepared 1-butyl-3-methylimidazolium hexafluorophosphate phosphate [C4MIM][PF6] and multiwalled carbon nanotubes (MWCNTs) nanocomposites were used to analyze rhodamine B (RhB); A novel ionic liquid microextraction combied with magnetic graphene solid-phase extraction method was first developed for the extraction of Sudan(I, II, III, IV) in food samples followed by detection using high-performance liquid chromatography; MIL-DLLME was applied for the extraction of fluoroquinolone drugs in honey and milk. The research contents are as follows:[C4MIM][PF6] coated MWCNTs has been formed a new kind of soft material by physical method. ultrasound-assisted dispersive solid-phase microextraction (US-DSPME) was developed for the determination of rhodamine B (RhB) in food samples. Under optimal experimental conditions, good linearity was observed in the range of 1.0-100.0 ng/mL with the correlation coefficient of 0.9978. Detection limits (LOD) and quantitation limits (LOQ) were 0.28 and 0.93 ng/mL, The modified method was Quick, Easy, Cheap, Effective, Rugged, and Safe. The relative standard deviation and the recoveries of RhB obtained were in the range of 1.7-6.8% and 85.1-96.0% with satisfied results.A novel ionic liquid microextraction combied with magnetic graphene solid-phase extraction method was first developed for the extraction of Sudan (I, II, III, IV) in food samples followed by detection using high-performance liquid chromatography. Under optimal conditions, good linearity was observed in the range of 10.0-500.0 ng/mL and 25.0-500.0 ng/mL with the correlation coefficient of 0.9992, 0.9990,0.9983 and 0.9946. Detection limits (LOD) and quantitation limits (LOQ) were 1.0 ng/mL,1.0 ng/mL,2.0 ng/mL,2.5 ng/mL and 3.0 ng/mL,3.0 ng/mL,6.7 ng/mL,8.3 ng/mL. The method is simple and quick, fully utilizing the strong adsorption of graphene and the hydrophobic property of ionic liquid to improve the extraction rate. And magnetic graphene with super paramagnetic, in the external magnetic field can be achieved rapid separation, the experimental time is short, the enrichment factor is high, the high rate of adsorbent recycling in the whole process. The relative standard deviation and the recoveries of Sudan (I, II, III, IV) obtained were in the range of 0.7-4.9% 95.9-102.4% with satisfied results.A simple, rapid and highly sensitive procedure on magnetic ionic liquid-based dispersive liquid-liquid microextraction (MIL-based DLLME) was developed for extracting NOR, CIP, ENR. Under the optimal conditions, the linear concentration range is 5-500 ng/mL and the linear correlation coefficient r is 0.9991-0.9996. The detection limits and limits of quantification were 3.1-4.4 ng/mL and 10.3-14.7 ng/mL. The extraction process was studied. In 288K,298K and 323K, the kinetic experiments were investigated. The results show that the extraction process is consistent with the pseudo first order kinetic model based on linear regression. And the Ea of NOR,CIP, ENR, were 13.3,1.08,7.03 kJ/mol, respectively. Indicates that the extraction process is diffusion controlled process.The MIL is easy to be separated, which avoids the tedious centrifugal process. Reduces the environmental pollution. This method is used in the experiment of NOR, CIP, ENR in milk and honey, and the recovery is in the range of 92.8-103.4%. The result is satisfactory. |
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