Papers by Author: Hyun Ku Joo

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Authors: Jae Kyung Yoon, Sang Hyun Bae, Jin Wook Ha, Hyun Ku Joo
Abstract: In this study, an anodized TiO2 electrode (ATE) on a titanium foil was prepared and used as a photoanode in an enzymatic photoelectrochemical system to split water into oxygen and hydrogen. The effect of applied voltage when anodized, thickness of foil, electrolytes, annealing temperature, and species of cathode was investigated. The optimum conditions were obtained such as 0.25 mm foil thickness, 20V of applied voltage in 0.5 vol% of hydrofluoric acid, and 650 oC of annealing temperature. The samples with higher activities had similar X-ray diffraction (XRD) patterns, clearly indicating that the samples showing the highest evolution rate were composed of both anatase and rutile, while those showing a lower evolution rate were made of either anatase or rutile. Increasing the intensity of the irradiated light caused a remarkable enhancement in the rate of hydrogen production up to 153 μmol/(hr×cm2) under light intensity of 146 mW/cm2.
Authors: Hyun Ku Joo, Sang Bong Lee, Yong Gun Shul, Jin Wook Ha
Abstract: This study investigated the effects of constituents in bio/photocatalytic hydrogen production system using an experimental design tool, a fractional factorial design. The factors considered included species of buffer solution, the amount of hydrogenase (Pyrococcus furiosus, Pfu), electron donor, reaction temperature and electron mediator. The experiments were designed to determine critical conditions that were required to achieve the highest level of H2 production.
Authors: Jae Kyung Yoon, Eun Jung Shim, Jin Wook Ha, Hyun Ku Joo
Abstract: In this study, immobilized nanotubular TiO2 is used to reduce toxic Cr(VI) to non toxic Cr(III) in aqueous solution under UV irradiation. To overcome the limitation of powder TiO2, a novel technique of immobilization based on anodization was applied and investigated under various experimental conditions. Among the samples tested under same anodizing condition, the nanotubular TiO2 annealed at 450 oC and 550 oC showed higher reduction efficiencies of Cr(VI). In addition, the surface characterizations (zeta potential, XRD and SEM) of these samples proved that the Cr(VI) reduction efficiency was higher under acidic conditions and at a lower annealing temperature. Through this study, it was concluded that anodized TiO2 has the potential to be useful technology for environmental remediation as well as hydrogen production in water.
Authors: Hong Dae Shin, Hyun Ku Joo, Jae Hyun Park, Chung Hyo Lee
Abstract: In this study, photocatalyst-coated glass beads by CVD, N-substituted TiO2 for visible light activation, plastic optical fiber bundle and treated Ti plate were considered as ‘Ecomaterials’ for the potential use in photocatalytic environmental purification system. Each material was carefully prepared and characterized to use in real system either by itself or together for a specific application. The absorption edge of the obtained TiON was ca. 530 nm and the presence of photocatalytic activity of the material under visible light was evidenced.
Authors: Hong Dae Shin, Hyun Ku Joo
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