• Title/Summary/Keyword: photocatalytic properties

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Control of Microstructure on TiO2 Nanofibers for Photocatalytic Application (광촉매 응용을 위한 TiO2 나노 섬유의 미세구조 제어)

  • Lee, Chang-Gyu;Kim, Wan-Tae;Na, Kyeong-Han;Park, Dong-Cheol;Yang, Wan-Hee;Choi, Won-Youl
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.31 no.6
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    • pp.417-421
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    • 2018

  • $TiO_2$ has excellent photocatalytic properties and several studies have reported the increase in its specific surface area. The structure of $TiO_2$ nanofibers indicates promising improved photocatalytic properties and these nanofibers can thus potentially be applied in air pollution sensors and pollutant removal filters. In this study, a $TiO_2$ nanofiber was fabricated by the electrospinning method. The fabrication processing factors such as the applied voltage, the distance between nozzle and collector, and the inflow rate of solution were controlled. The precursor was titanium (IV) isopropoxide and as-spun $TiO_2$ nanofibers were heated at $450^{\circ}C$ for 2 h to obtain an anatase crystalline structure. The microstructure was analyzed using field emission scanning electron microscope (FE-SEM) and X-ray diffraction analysis (XRD). The anatase phase was observed in the $TiO_2$ nanofibers after heat treatment. The diameter of $TiO_2$ nanofibers increased with the flow rate, but decreased with decreasing applied voltage and nozzle to collector distance. The diameter of $TiO_2$ nanofibers was controlled in the range of 364 nm to 660 nm. These nanofibers are expected to be very useful in photocatalytic applications.

  • https://doi.org/10.4313/JKEM.2018.31.6.417 인용 PDF KSCI

Comparative Analysis of the Physical Properties and Photocatalytic Effects for C/TiO2 Complexes Derived from Titanium n-butoxide

  • Oh, Won-Chun;Park, Tong-So
    • Environmental Engineering Research
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    • v.12 no.5
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    • pp.218-223
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    • 2007

  • The hybrid $C/TiO_2$ complexes were prepared by a method involving the penetration of titanium n-butoxide (TNB) solution with porous carbons. The photocatalysts were investigated for their surface textural properties and SEM morphology, structural crystallinity and elemental identification between porous carbon and $TiO_2$, and dye decomposition performance. For all the $C/TiO_2$ complexes prepared by TNB solution methods, the excellent photocatalytic effect for dye degradation should be attributed to the synergitic effects between photo-decomposition of the supported $TiO_2$ and adsorptivity of the porous carbons.

  • https://doi.org/10.4491/eer.2007.12.5.218 인용 PDF KSCI

Synthesis of titania nanopowder and its photocatalytic properties

  • Jang, Hee-Dong;Lee, Jae-Chun;Kil, Dae-Sup
    • 한국지구물리탐사학회:학술대회논문집
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    • 2003.11a
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    • pp.569-572
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    • 2003

  • Titanium dioxide ($TiO_2$) nanoparticles were prepared by the oxidation of titanium tetrachloride ($TiCl_4$) in a diffusion flame reactor. The average diameter of particles was 15 to 30 nm and mass fraction of anatase ranged from $40\;to\;80\%$. Effects of particle size and phase composition of those $TiO_2$ nanoparticles on photocatalytic properties such as decomposition of methylene blue and bacteria gas were investigated. The degree of decomposition of methylene blue by the $TiO_2$ nanoparticles under the illumination of the black light was directly proportional to the anantase mass fraction, but inversely to the particle size. The decomposition of bacteria by the $TiO_2$ nanoparticles under the illumination of the fluorescent light showed the same trend as in the case of the methylene blue.

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Preparation and Catalytic Properties of Pt/CNT/TiO2 Composite

  • Chen, Ming-Liang;Zhang, Feng-Jun;Oh, Won-Chun
    • Journal of the Korean Ceramic Society
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    • v.47 no.4
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    • pp.269-275
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    • 2010

  • In this study, we successfully prepared CNT/$TiO_2$, Pt/CNT and Pt/CNT/$TiO_2$ composites and investigated their photocatalytic activity in MB solution by irradiation under UV light. Fourier transform infrared (FT-IR) spectroscopy was used to characterize the functional group on the surface of MWCNTs, which oxidized by MCPBA. Brunauer-Emmett-Teller (BET) surface area, transmission electron microscopy (TEM), X-ray diffraction (XRD) and energy dispersive X-ray (EDX) were used to analyze the prepared composites. The results of the decomposition of the MB solution indicated that the Pt/CNT/$TiO_2$ composite had the best photocatalytic activity among the three kinds of composites.

  • https://doi.org/10.4191/KCERS.2010.47.4.269 인용 PDF KSCI