Entity

Time filter

Source Type


Hwang K.-J.,University of California at San Diego | Kang D.,Korea Institute of Energy Research | Lee S.,Korea Institute of Energy Research | Hwang C.-H.,Chosun University | And 7 more authors.
Materials Letters | Year: 2014

Hollow TiO2 fibers with a high surface area were prepared by a simple manufacturing method using Ceiba pentandra (L.) Gaertn. (kapok) as a natural biomass template. Heat treatment was used for the removal of the kapok template. The uniform morphology of the hollow TiO2 fibers with an average diameter of 10 μm was investigated by field emission scanning electron microscopy (FE-SEM). In spite of the micrometer size of the hollow TiO2 fibers, the walls had a high surface area (143 m2/g) and a high pore volume (0.21 cm3/g), as determined by Brunauer-Emmett-Teller (BET) analysis. Calcination was found to promote the crystalline transformation of TiO2, as evidenced by X-ray diffraction (XRD). © 2013 Elsevier B.V. Source


Chung J.-T.,Korea Gas Corporation | Hwang K.-J.,Chosun University | Shim W.-G.,Chonnam National University | Kim C.,Amotech New Materials Research Center | And 3 more authors.
Materials Letters | Year: 2013

Hollow carbon fibers with a high adsorption capacity for the removal of methylene blue from aqueous solution were produced from Ceiba pentandra (L.) Gaertn. (kapok). Steam was used for the oxidation and modification of the carbon surface. Compared to the kapok-derived carbonized hollow carbon fibers (KCHCF) without activation, the kapok-derived activated hollow carbon fibers (KAHCF) according to steam activation times showed a higher surface area (600∼800 m2/g) and larger hollow pore volume. The adsorption capacity of methylene blue on KAHCF according to temperature and solution pH showed the best fit with Langmuir isotherm model. © 2012 Elsevier B.V. Source


Hwang K.-J.,Korea Electronics Technology Institute | Shim W.-G.,Chonnam National University | Kim J.-H.,Chosun University | Choi D.-Y.,Chosun University | And 4 more authors.
Materials Letters | Year: 2013

New hollow carbon fibers with a high adsorption capacity for the removal of reactive black 5 dye from aqueous solution were produced from Pleuropterus multiflorus TURCZ. (Hasuo). Steam was used for the activation and modification of the carbon surface. A higher surface area (400-845 m2/g) and larger hollow pore volume were observed for the Hasuo-derived activated hollow carbon fibers (HAHCF). The adsorption capacity of reactive black 5 dye on HAHCF in terms of temperature and solution pH was investigated. © 2013 Published by Elsevier B.V. Source


Park K.-H.,Chonnam National University | Choi D.-Y.,KHT Engineering Co. | Park J.-H.,Chosun University | Kim C.,Amotech New Materials Research Center | And 2 more authors.
International Journal of Electrochemical Science | Year: 2016

Electrospinning technique is a powerful and effective method for the preparation of nanofibers. Here we demonstrated an efficient prussian blue (PB) nanofibers prepared by the electrospinning method using polyarylonitrile as a precursor. The samples were characterized by scanning electron microscopy, thermogravimetric analysis, energy-dispersive X-ray spectroscopy and Brunauer-Emmet-Teller method. The adsorption equilibrium data were obtained at different temperatures and fitted with the Langmuir isotherm. We found that the novel PB nanofibers could efficiently remove the cesium ions dissolved in water. Source

Discover hidden collaborations