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- 저자 : Zhenjiang Tan (검색결과 3 건)
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Zhenjiang Tan,Minggao Tan,Jiangdong Dai,Wenna Ge,Wenjing Zhu,Yongsheng Yan 한국섬유공학회 2020 Fibers and polymers Vol.21 No.4
Here, novel magnetic imprinted porous foams (MIFs) were prepared by Pickering oil-in-water high internal phaseemulsion polymerization, using renewable cellulose nanocrystals (CNCs) derived from cotton source as the stabilizer, andsurfactant Tween 85 and iron oxide magnetic nanoparticles as additive in aqueous phase, for selective adsorption of 4-nitrophenol (4-NP). Interconnected porous foam structure was formed and optimized by controlling the addition amount ofsolid stabilizer CNCs, Tween 85, and oil phase volume, the optimum value of which was 7.5 wt%, 5.0 wt%, and 85 %,respectively. The as-synthesized imprinted material had the good thermal stability and magnetic responsivity. The adsorptionequilibrium data was fitted well by the Langmuir isothermal model with a maximum adsorption capacity of 287.5 μmol/g. Pseudo-second-order kinetics model could better describe the kinetics data. MIFs showed excellent selective ability for 4-NPas compared with these structural analogues. Besides, Thomas model explained the dynamic breakthrough curves better. Theregeneration ability of MIFs was also satisfying after several reuse.
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Ping Yu,Qilong Sun,Jianfeng Li,Zhenjiang Tan,Jianming Pan,Yongsheng Yan 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
Magnetic molecularly imprinted microspheres (MMIS) were successfully prepared by suspension polymerization,and then as-prepared MMIS were used as adsorbents for selective recognition of 2,4,6-trichlorophenol (2,4,6-TCP) from aqueous solutions. The results composites were characterized by Fourier transform infrared (FT-IR), X-raydiffraction (XRD), thermo gravimetric analysis (TGA), scanning electron microscope (SEM) and vibrating samplemagnetometer (VSM). The results demonstrated that MMIS possesses porous spherical morphology, and exhibits goodthermal stability and magnetic property (Ms=10.14 emu g−1). Then batch mode of binding experiments was used todetermine the equilibrium, kinetics and selectivity recognition. The Langmuir isotherm model fitted the equilibriumdata better than did the Freundlich model, and the maximum adsorption capacity on MMIS was about 1.7 times higherthan that of MNIS. Kinetics behaviors of MMIS were well described by the pseudo-second-order model. MMIS possessedoutstanding selectivity recognition for 2,4,6-TCP in the presence of other competitive phenols (such as sesamol,3-CP, thymol, 2,4-DCP). Furthermore, the reusability performance of MMIS showed about 17.53% loss after five repeatedcycles. Finally, the MMIS were successfully applied to the selective extraction of 2,4,6-TCP from the vegetablesamples.
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Ping Yu,Yongsheng Yan,Qilong Sun,Jianfeng Li,Zhenjiang Tan,Chunxiang Li 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
In the work, we reported an effective method for the preparation of surface molecularly imprintedpolymers based on bacillus as substrate material with superparamagnetic property throughminiemulsion polymerization. Then, the obtained magnetic surface molecularly imprinted polymers(MMIPs) were evaluated as adsorbents for selective recognition 2,4,6-trichlorophenol (2,4,6-TCP) fromaqueous medium. The resulting MMIPs were characterized by several techniques including FT-IR, SEM,TEM, Raman, XRD, VSM and TGA. The results demonstrated rod-shaped MMIPs was covered withimprinted layer, and exhibited chemical stability and good magnetic sensitivity. Batch mode of bindingstudies were carried out to determine the equilibrium isotherm, kinetics, selectivity adsorption andregeneration of MMIPs toward 2,4,6-TCP. The results indicated that the selective adsorption behaviors ofMMIPs were well described by the Langmuir isotherm model and the pseudo-second-order kineticsmodel. The specific adsorption capacity of MMIPs was 45.16 mg g 1 at 298 K, which was 2.15 timeshigher than that of magnetic non-imprinted polymers (MNIPs). The selective recognition studiesdemonstrated the outstanding affinity and selectivity toward 2,4,6-TCP in the presence of competitivephenols. The regeneration study showed excellent adsorption capacity even after five regenerationcycles. In addition, MMIPs were successfully applied to the extraction of 2,4,6-TCP from milk sample.
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