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열처리 온도에 따라 제조된 탄소 코팅된 TiO<sub>2</sub>에 대한 광촉매 효과
진명량,배장순,오원춘,Chen, Ming-Liang,Bae, Jang-Soon,Oh, Won-Chun 한국분석과학회 2006 분석과학 Vol.19 No.6
Carbon-coated $TiO_2$ was prepared by $CCl_4$ solvent mixing method with different heat treatment temperature (HTT). Since the carbon layers derived from pitch on the $TiO_2$ particles were porous, the carbon-coated $TiO_2$ sample series showed a good adsorptivity and photo decomposition activity. The BET surface area was decreased by the increasing of the heat treatment temperature. The SEM results present to the characterization of surface texture on the carbon-coated $TiO_2$ sample and carbon distributions on the surfaces for all the materials used. The main elements of C, O and Ti were shown from EDX spectra. And the quantity of these elements is very rich in the samples. From XRD data, the pristine anatase peaks were observed in the X-ray diffraction patterns for the carbon-coated $TiO_2$ at the different HTTs. However, the rutile peaks were observed for the carbon-coated $TiO_2$ at HTT of 1073 K and 1123 K. Finally, the excellent photocatalytic activity of carbon-coated $TiO_2$ with UV-vis spectra between absorbance and time could be attributed to the homogeneous coated carbon on the external surface and structural phase transform, and the photocatalytic activity was decreased by the increasing of the HTT.
진명량,장봉군,오원춘,Chen, Ming-Liang,Zhang, Feng-Jun,Oh, Won-Chun The Korean Society of Analytical Sciences 2008 분석과학 Vol.21 No.6
$CNT/TiO_2$ composites were prepared by using multiwall carbon nanotubes (MWCNT) and various titanium alkoxide precursors. The composites were comprehensively characterized by scanning electron microscopy (SEM), field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) and UV-vis absorption spectroscopy. The photoactivity of the prepared materials under UV irradiation, was tested using the conversion of MB from model aqueous solution. Finally, according to the results of methylene blue (MB) removal experiment, we could see that sample CTOS have better MB removal effect than samples CTIP and CTPP.
Preparation and photocatalytic effect of MWCNT/TiO<sub>2</sub> composites
진명량,오원춘,Chen, Ming-Liang,Oh, Won-Chun The Korean Society of Analytical Sciences 2008 분석과학 Vol.21 No.3
$C/TiO_2$ composites were prepared with surface modified MWCNT sequentially after HCl treatment and TNB as titanium source. There is a single crystal structure which is anatase in all of the samples from the data of XRD. The SEM microphotographs of $C/TiO_2$ composites show that the $TiO_2$ particles were well mixed with the CNT. There are C, O and Al with strong Ti peaks in all samples from EDX results, and it also shows that the sample CT has much more amount of C and Ti content than that of sample HCT. Finally, the photocatalytic activities for the $C/TiO_2$ composites have more effective than that of pristine $TiO_2$.
여러 가지 탄소 전구체와 TNB를 이용하여 탄소-TiO2 복합체를 제조 및 그들의 광촉매 특성
진명량 ( Ming Liang Chen ),장봉군 ( Feng Jun Zhang ),장간 ( Kan Zhang ),맹칙달 ( Ze Da Meng ),오원춘 ( Won Chun Oh ) 한국고무학회 2010 엘라스토머 및 콤포지트 Vol.45 No.1
우리는 탄소 전구체로 활성탄 (AC), 활성탄 섬유 (ACF)와 탄소나노튜브 (MWCNT)와 티타늄 전구체로써 TNB를 사용하여 탄소-TiO2 복합체를 제조하였으며, 이들의 특성을SEM, TEM, BET, XRD와 EDX를 이용하여 분석하였다. 그리고 이들의 광촉매 활성은 UV 램프 조사에서 일정한 농도의 MB 용액을 이용하여 측정하였다. UV조사한 후에 MB의 농도는 UV-vis 분광광도기를 이용하여 측정하였다. We used activated carbon (AC), activated carbon fiber (ACF) and multi-walled carbon nanotube (MWCNT)as carbon sources and titanium n-butoxide as titanium source to prepare carbon-TiO2 composites. For characterization their properties, scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET surface area, X-ray diffraction(XRD) and energy dispersive X-ray analysis (EDX) were used. And the photoactivity of the carbon-TiO2 composites, underUV irradiation, was tested using the fixed concentration of methylene blue (MB, C16H18N3S·Cl·3H2O) in aqueous solution. After UV irradiation for a certain time, the concentration of MB solution was determined by UV-vis absorption spectroscopy.
Preparation of Co-ACFs/TiO2 composites and its photodegradation of methylene blue
Won-Chun Oh(오원춘),Ho-Jung Kwon(권호정),Ming-Liang Chen(진명량),Feng-Jun Zhang(장봉군) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.11
코발트 적재된 활성탄소섬유(ACFs)는 이산화티탄(TiO₂) 광촉매 반응을 촉진시키는 것을 발전되었다. Co-ACFs/TiO₂ 광촉매는 SEM, XRD, EDX 및 UV-vis 분광기를 사용하여 분석하였다. Co-ACFs/TiO₂ 광촉매에 대한 메틸렌불루(MB)의 분해 효과는 300분 반응해서 거의 100%를 도달하였다. 용액에 있는 MB 분자들은 ACFs의 흡착 에 의해 TiO₂ 입자의 주위에 응축한다고 가정되었다. 그래서 이 광촉매 복합체는 MB 광분해에 대한 활성탄의 흡착 성과 TiO₂의 광촉매 특성의 결합한 성능을 가지고 있다. 코발트가 전자 천이 효과를 가지고 있기 때문에 MB 용액 의 광분해가 증가되는 것으로 판단된다. Cobalt-loaded activated carbon fibers (ACFs) supported titanium dioxide (TiO₂) photocatalyst was developed by sol-gel method. The Co-ACFs/TiO₂ photocatalyst were characterized by scanning electron microscope (SEM), X‐ray diffraction patterns (XRD), energy dispersive X‐ray analysis (EDX) and UV-vis absorption spectroscopy. Decomposition efficiency of methylene blue (MB) solution by Co-ACFs/TiO₂ photocatalyst reached almost 100% under 300 min reaction. The MB molecules in the bulk solutions were supposed to be condensed around TiO₂ particles by adsorption of ACFs. Therefore, the photocatalyst possesses the combined effect of adsorption by activated carbon fibers and photocatalytic reactivity of TiO₂ on MB degradation. Due to the cobalt has electron transition effece, thus improved the photodegradation of MB solution.