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      저자 : Wenfang He (검색결과 3 건)
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        Overview of the Application of Flow Microreactors in the Synthesis of Silver Nanomaterials

        Xiaoai He,Aijuan Lu,Jin Cheng,Junfang Chen,Qianhui Song,Wenfang Liu,Chuanpin Chen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.11

        The unique electrical, optical and biological properties of silver nanomaterials have attracted significant attention of many researchers. Since the size and shape of silver nanomaterials have significant effects on the properties of silver nanomaterials, extensive research has focused on synthesis and characterization of silver nanomaterials. However, almost all of the syntheses of silver nanomaterials were carried out in traditional batch reactors, which typically suffer from inhomogeneous mixing and corresponding spatial variations under reaction conditions, ultimately leading to poor quality of the final nanomaterials. Recently, the emerging microfluidic technology not only furnishes novel strategies for the synthesis of silver nanomaterials but also brings great opportunities and impetus to improve the quality and yield of silver nanomaterials due to enhanced mass and heat transfer. The current paper reviews recent achievements in the synthesis of silver nanomaterials in flow microreactors. Various strategies adopted for the synthesis of silver nanomaterials in microreactors are presented and compared, including synthesis in single-phase and multi-phase flow microreactors. In addition, the factors that affect the size and size distribution of silver nanomaterials in flow microreactors synthesis are also discussed briefly.

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        Removal of UO2 2+ from aqueous solution using halloysite nanotube-Fe3O4 composite

        Yuantao Chen,Wenfang He,Wei Zhang,Chunlian Hu,Jian Wang,Pingping Wang 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.1

        Halloysite nanotubes (HNTs) were modified with Fe3O4 to form novel magnetic HNTs-Fe3O4 composites, and the composites were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR) and vibrating sample magnetometer (VSM). The as-obtained results indicated that Fe3O4 nanoparticles were successfully installed on the surface of HNTs. The adsorption of UO2 2+ on HNTs-Fe3O4 was investigated as a function of solid content, contact time, pH, ionic strength and temperature by batch experiments. The consequences revealed that the adsorption of UO2 2+ onto HNTs-Fe3O4 was strongly dependent on pH and ionic strength. Equilibrium data fitted well with the Langmuir isotherm. The experimental results demonstrated that the adsorbents with HNTs-Fe3O4 had the largest adsorption capacity of 88.32mg/g for UO2 2+.

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        Rapid adsorption of cobalt (II) by 3-aminopropyltriethoxysilane modified halloysite nanotubes

        Xin Wang,Yuantao Chen,Wei Zhang,Wenfang He,Jian Wang,Biqing Chen 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.12

        The adsorption of cobalt (II) by 3-aminopropyltriethoxysilane (APTS) modified halloysite nanotubes (HNTs) was studied. The modified halloysite was characterized by Fourier transform infrared spectroscopy (FT-IR), XRay diffraction (XRD) and thermogravimetry (TG). In addition, a batch method was used to study the adsorption behavior and the mechanism of removal Co (II) by modified HNTs; the effective factors influencing the adsorption process including adsorbent concentration, contact time, initial pH, temperature and the initial concentration of Co (II) have been investigated. The results showed that the APTS was successfully grafted on the HNTs surface. The modified HNTs exhibited rapid adsorption speed, which reached the adsorption equilibrium within 30 min. The adsorption capacity of the adsorbent increased significantly with the increase of pH. The adsorption data of Co (II) on the modified HNTs are well consistent with the Langmuir model and the pseudo-second-order kinetic model.

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