Thermo-responsive and magnetic molecularly imprinted Fe3O4@carbon nanospheres for selective adsorption and controlled release of 2,4,5-trichlorophenol

Jixiang Wang,Jianming Pan,Yijie Yin,Runrun Wu,Xiaohui Dai,Jiangdong Dai,Lin Gao,Hongxiang Ou 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-

Thermal-responsive and magnetic molecularly imprinted polymers (TMMIPs) based on Fe3O4@carbon (Fe3O4@C) were prepared by free radical polymerization and applied to selective adsorption and controlled release of 2,4,5-trichlorophenol (2,4,5-TCP) from aqueous solution. TMMIPs were composed of multilayer structure, and exhibited magnetic sensitivity, magnetic stability and thermal stability (especially below the. The reversible transform of mean diameter resulted from the change of testing temperature, indicating the thermo-responsive properties of TMMIPs. Selective adsorption and controlled release of 2,4,5-TCP were also investigated at 25 8C and higher temperature (such as 45 8C and 60 8C), respectively.

Ion/molecule imprinted polymers with double binding sites via twice imprinting strategy for selective and simultaneous removal of l-cyhalothrin and Cu(II)

Hengjia Zhu,Jianming Pan,Jun Cao,Yue Ma,Fengxian Qiu,Wenli Zhang,Yongsheng Yan 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.49 No.-

Herein we reported a facile method to prepare porous ion/molecule imprinted polymers (I-MIPs) viatwice imprinting strategy for the simultaneous uptake of copper ions (Cu(II)) and l-cyhalothrin (LC). Firstly, N-(b-aminoethyl)-g-aminopropytrimethoxysilane (DAMO) was grafted on silica particles surfaceto synthesis Cu(II)-imprinted polymers to introduce iron imprinted sites. They were then utilized asstabilizers to prepare a stable W/O Pickering HIPEs template (LC as the imprinting molecule), which wasthen polymerized with dual imprinting sites including Cu(II) and LC. The adsorption equilibrium, kineticresults and selective recognition experiments were exhibited their prospected dual selectivity andsimultaneous removal of LC and Cu(II).

The Expression and Relationship of CD68-Tumor-Associated Macrophages and Microvascular Density With the Prognosis of Patients With Laryngeal Squamous Cell Carcinoma

Shujun Sun,Xinliang Pan,Limin Zhao,Jianming Zhou,Hongzeng Wang,Yonghong Sun 대한이비인후과학회 2016 Clinical and Experimental Otorhinolaryngology Vol.9 No.3

Objectives. We sought to identify the expression of CD68-tumor-associated macrophages (TAMs) and CD34-microvascular density (MVD) in laryngeal squamous cell carcinoma (LSCC), to study the relationship with clinical pathological parameters and to determine whether their expression is predictive of disease. Methods. Pathologically confirmed 45 LSCC tissue and 20 peritumoral non-tumor tissue were examined. Immunohistochemical studies were used to detect the expression of CD68-TAMs and CD34-MVD. Results. The positive expression rate of CD68 in LSCC tissue was 82% (37/45), which was higher than the 10% (2/20) expression rate of the peritumoral tissue (P<0.05). The CD34-MVD positive expression rate in the LSCC tissue was 26.5±6.4, which obviously higher than 12.2±4.0 expression rate of the peritumoral tissue (P<0.05). The positive expression rates of both CD68 and CD34-MVD were higher in the lymph node metastasis (LNM) positive group than in the LNM negative group. The expression of CD68 had positive correlation with CD34-MVD. The 5-year disease-free survival rate in the group with the low CD68 expression was significantly higher than that in the group with high CD68 expression (76% vs. 42%, respectively). Conclusion. The high expression of CD68-TAMs in LSCC and its positive correlation with CD34-MVD illustrates that both play an important role in promoting the metastasis and angiogenesis of this cancer. Their expression was also positively correlated with the prognoses of these patients, suggesting that they could be used as important prognostic markers for LSCC.

Numerical Investigation of Wind Pressure Coefficients for Photovoltaic Arrays Mounted on Building Roofs

Jiayang Li,Lewei Tong,Jianming Wu,Yeming Pan 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.8

The wind pressure distribution on the photovoltaic (PV) array is of great importance to the wind resistance design. The flow field related to the pressure can be influenced significantly by the turbulence induced by the building roof edge (Kopp et al., 2012) and it is essential to consider the building effect during the investigation. However, most CFD (computational fluid dynamics) investigations of wind pressure distribution on the PV array are limited to ground mounted PV array without the building. There is a necessity to extend the application of CFD method to flows around roof-mounted PV array. This study investigated the wind pressure distributions on PV arrays mounted on building roofs by means of Reynolds-averaged Navier–Stokes (RANS) approach using the FLUENT software. Since RANS models are sensitive to the flow condition, several RANS models are adopted and the most accurate RANS model for predicting this type of flow is identified based on a comparison with the wind tunnel experimental results. The SST k-ω model can predict the highest net mean wind uplift located at panels upstream accurately and is further applied for the parameter analysis to facilitate the installation of roof-mounted PV array. Numerical simulations of the wind flow field for wind angles between 0° to 180° were carried out at intervals of 20°, and the resulted net pressure distributions were presented. The influences of tilt angles of the PV array were investigated and the pressure distributions of PV panels were related to the flow field. Moreover, the effects of clearance between the PV array and building roof on the flow fields and pressure distributions of the PV array related to PV array tilt angle are studied.

Preparation and characterization of molecularly-imprinted magnetic microspheres for adsorption of 2,4,6-trichlorophenol from aqueous solutions

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.

Facile synthesis of imprinted submicroparticles blend polyvinylidene fluoride membranes at ambient temperature for selective adsorption of methyl p-hydroxybenzoate

Yanhua Cui,Minjia Meng,Dongshu Sun,Yan Liu,Jianming Pan,Xiaohui Dai,Yongsheng Yan 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.3

We developed a simple phase inversion technique to prepare molecularly imprinted membrane (MIM) at room temperature for membrane selective adsorption and separation of methyl p-hydroxybenzoate (M4HB). The prepared SMIP-MIM was characterized by SEM, FT-IR, TGA. Compared with non-imprinted membrane (NIM1-5) adsorbent, SMIP-MIM1-5 adsorbent with high specific surface area and showed higher binding capacity, faster kinetic and better selectively adsorption capacity for M4HB. The maximum isotherm adsorption capacity for M4HB of SMIPMIM4 was 3.519mg·g−1, and the experimental data was well fitted to the slips model by multiple analysis. The maximum kinetic adsorption capacity and equilibrium adsorption time for SMIP-MIM4 were 1.335mg·g−1 and 160 min, respectively. The mechanism for dynamic adsorption of M4HB onto SMIP-MIM4 was found to follow pseudo-firstorder model and pseudo-second-order model. Additionally, the permeability separation factor of SMIP-MIM4 for M4HB compared to a structural analogues methyl 2-hydroxybenzoate (M2HB) could reach 2.847. The adsorption capacity of SMIP-MIM4 for M4HB and M2HB was 0.549mg·cm−2 and 1.563mg·cm−2, respectively. The adsorption behavior of M4HB through SMIP-MIM4 followed the retarded permeation mechanism.