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In-Cheol Kang 6 Articles
Preparation of WO3-TiO2 Photocatalyst and Evaluation of Its Photo-activity in the Visible Light Range
In-Chul Yeo, In-Cheol Kang
J Korean Powder Metall Inst. 2013;20(6):474-478.
DOI: https://doi.org/10.4150/KPMI.2013.20.6.474
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AbstractAbstract PDF
The most general photocatalyst, TiO_2 and WO_3, are acknowledged to be ineffective in range of visible light. Therefore, many efforts have been directed at improving their activity such as: band-gap narrowing with non-metal element doping and making composites with high specific surface area to effectively separate electrons and holes. In this paper, the method was introduced to prepare a photo-active catalyst to visible irradiation by making a mixture with TiO_2 and WO_3. In the TiO_2-WO_3 composite, WO_3 absorbs visible light creating excited electrons and holes while some of the excited electrons move to TiO_2 and the holes remain in WO_3. This charge separation reduces electron-hole recombination resulting in an enhancement of photocatalytic activity. Added Ag plays the role of electron acceptor, retarding the recombination rate of excited electrons and holes. In making a mixture of TiO_2-WO_3 composite, the mixing route affects the photocatalytic activity. The planetary ball-mill method is more effective than magnetic stirring route, owing to a more effective dispersion of aggregated powders. The volume ratio of TiO_2(4) and WO_3(6) shows the most effective photocatalytic activity in the range of visible light in the view point of effective separation of electrons and holes.

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  • Photocatalytic activity of rutile TiO2 powders coupled with anatase TiO2 nanoparticles using surfactant
    Jong Min Byun, Chun Woong Park, Young In Kim, Young Do Kim
    journal of Korean Powder Metallurgy Institute.2018; 25(3): 257.     CrossRef
  • Synthesis and Characterization of TiO2/CuS Nanocomposite Fibers as a Visible Light-Driven Photocatalyst
    HyeLan An, Leeseung Kang, Hyo-Jin Ahn, Yong-Ho Choa, Chan Gi Lee
    Journal of the Korean Ceramic Society.2018; 55(3): 267.     CrossRef
A Study of Mechanical Properties and Microstructure of ZrO2-Ag Depending on the Composite Route
In-Chul Yeo, Jae-Kil Han, In-Cheol Kang
J Korean Powder Metall Inst. 2012;19(6):416-423.
DOI: https://doi.org/10.4150/KPMI.2012.19.6.416
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This paper introduces an effect of a preparing ZrO_2-Ag composite on its mechanical properties and microstructure. In present study, ZrO_2-Ag was prepared by reduction-deposition route and wetting dispersive milling method, respectively. Two type of Ag powders (nano Ag and micron Ag size, respectively) were dispersed into ZrO_2 powder during wetting dispersive milling in D.I. water. Each sample was sintered at 1450°C for 2hr in atmosphere, and then several mechanical tests and analysis of microstructure were carried out by bending test, hardness, fracture toughness and fracture surface microstructure. As for microstructure, the Ag coated ZrO_2 showed homogeneously dispersed Ag in ZrO_2 in where pore defect did not appear. However, ZrO_2-nano Ag and ZrO_2-micro Ag composite appeared Ag aggregation and its pore defect, which carried out low mechanical property and wide error function value.
Influence of MAO Conditions on TiO2 Microstructure and Its Photocatalytic Activity
Jeong-Gon Kim, In-Cheol Kang
J Korean Powder Metall Inst. 2012;19(3):196-203.
DOI: https://doi.org/10.4150/KPMI.2012.19.3.196
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TiO_2 was successfully formed on a Ti specimen by MAO (Micro-Arc-Oxidation) method treated in Na_3PO_4 electrolyte. This study deals with the influence of voltage and working time on the change of surface microstructure and phase composition. Voltage affected the forming rate of the oxidized layer and surface microstructure where, a low voltage led to a high surface roughness, more holes and a thin oxidized layer. On the other hand, a high voltage led to more dense surface structure, wider surface holes, a thick layer and fewer holes. Higher voltage increases photocatalytic activity because of better crystallization of the oxidized layer and good phase composition with anatase and rutile TiO_2, which is able to effectively separate excited electrons and holes at the surface.

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  • Study on thermal behavior of Ammonium Hexafluofide Titanate for Synthesis of TiO2 Powders
    Duk-Hee Lee, Jae-Ryang Park, Chan-Gi Lee, Kyung-Soo Park, Hyeon-Mo Kim
    Journal of Korean Powder Metallurgy Institute.2016; 23(5): 353.     CrossRef
  • Control of Nano-Scaled Surface Microstructure of Al Sample for Improving Heat Release Ability
    In-Chul Yeo, In-Cheol Kang
    Journal of Korean Powder Metallurgy Institute.2015; 22(1): 21.     CrossRef
Investigation About Surface Microstructure of Aluminum with Change of Voltage, a Period of Treatment and Density of Electrolyte in Micro-Arc Oxidation Treatment
In-Chul Yeo, In-Cheol Kang
J Korean Powder Metall Inst. 2011;18(6):575-582.
DOI: https://doi.org/10.4150/KPMI.2011.18.6.575
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AbstractAbstract PDF
MAO(Micro-Arc Oxidation) method was used to make Al_2O_3 surface on 6063 Al specimen. This study was focused on an influence of voltage, density of electrolyte and a period of treatment on the change of surface microstructure by using SEM(Scanning Electron Microscope), EDS(Energy Dispersive X-ray Spectroscopy). The microstructure shows higher roughness and thicker oxidized layer with increase of voltage and maintaining period of treatment. The density of electrolyte affected a formation of more dense surface and increase of a oxidized layer.

Citations

Citations to this article as recorded by  
  • Control of Nano-Scaled Surface Microstructure of Al Sample for Improving Heat Release Ability
    In-Chul Yeo, In-Cheol Kang
    Journal of Korean Powder Metallurgy Institute.2015; 22(1): 21.     CrossRef
  • Influence of MAO Conditions on TiO2Microstructure and Its Photocatalytic Activity
    Jeong-Gon Kim, In-Cheol Kang
    Journal of Korean Powder Metallurgy Institute.2012; 19(3): 196.     CrossRef
Preparation of C Doped TiO2 Photocatalyst Activating to Visible Irradiation and Investigation of Its Photocatalytic Activity
In-Chul Yeo, In-Cheol Kang
J Korean Powder Metall Inst. 2010;17(4):281-288.
DOI: https://doi.org/10.4150/KPMI.2010.17.4.281
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A carbon doped TiO_2 (C-TiO_2) photocatalyst, which shows good photocatalytic activity to Ultraviolet irradiation and visible irradiation, was successfully prepared by co-grinding of TiO_2 with ethanol or Activated Carbon(C), followed by heat treatment at 200°C in air for 60 min. Ethanol and C were used as a representative agent of liquid and solid for carbon doping. Their influence on improving photocatalytic ability and carbon doping degree was studied with degradation of methyl orange and XPS analysis. The product prepared by co-grinding of TiO_2 with Ethanol had Ti-C and C-O chemical bonds and showed higher photocatalytic activity than the product prepared by co-grinding of TiO_2 with C, where just C-O chemical bond existed. As a result, mechanochemical route is useful to prepare a carbon doped TiO_2 photocatalyst activating to visible irradiation, where the solid-liquid operation is more effective than solid-solid operation to obtain a carbon doped TiO_2.
The Relation Between a Visible-light Photocatalytic Activity of TiO2-xNx and NH3 Amount/the Period of Grinding Time
In-Cheol Kang, Jun-Bin Ko, Jae-Kil Han, Kwang-Hee Kim, Sung-Chang Choi
J Korean Powder Metall Inst. 2009;16(3):196-202.
DOI: https://doi.org/10.4150/KPMI.2009.16.3.196
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A visible-light photoactive TiO_2-xN_x photocatalyst was synthesized successfully by means of cogrinding of anatase-TiO_2(a-TiO_2) in NH_3 ambient, followed by heat-treatment at 200°C in air environment. In general, it is well known that the grinding-operation induces phase transformation of a-TiO_2 to rutile TiO_2. This study investigates the influence of the amount of NH_3 gas on the phase transformation rate of a-TiO_2 and enhancement of visible-light photocatalytic activity, and also examines the relation between the photocatalytic activity and the period of grinding time. The phase transformation rate of a-TiO_2 to rutile is retarded with the amount of NH3 injected. And the visible-light photocatalytic activity of samples, was more closely related to the period of grinding time than NH_3 amount injected, which means that the doping amount of nitrogen into TiO_2 more effective to mechanical energy than NH_3 amount injected. XRD, XPS, FT-IR, UV-vis, Specific surface area (SSA), NOx decomposition techniques are employed to verify above results more clearly.

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