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주현규(Joo Hyun-Ku),하진욱(Ha Jin-Wook),조덕호(Cho Duk-Ho) 한국산학기술학회 2005 한국산학기술학회논문지 Vol.6 No.4
최근 일본이 광촉매 관련 제품에서의 소비자 보호를 위한 적절한 표준화 규격 제정에 강한 의욕을 보이며, 자국내 JIS 규격 외에 ISO 규격 (ISO/TC 206 fine ceramics)을 제정하기 위하여 노력하고 있다. 이에 국내에서는 산업 보호 및 해외시장에서의 종속성을 벗어나기 위하여 2001년부터 선정된 분야에서의 광촉매표준화 시도가 이루어졌다. 그 중의 하나로 본 논문은 광섬유를 빛전달 매개체와 광촉매 코팅 지지체로 이용해서 광촉매 졸을 구성하는 광촉매 자체의 유기물 분해능을 결정하는 방법을 규정하는 과정과 제안과 관련된 것이다. 이 규격은 코팅 가능한 졸이나 졸로 만들 수 있는 자외선 감응 광촉매 재료에 적용하며, 차후 가시광 및 태양광 감응 광촉매 활성 측정 및 비교에도 응용이 가능할 것으로 판단된다. Recently, Japan has showed strong demand for protection of consumers against misleading specification provided by producers, establishing the committee for 1IS and ISO. To protect domestic market and overcome potential subordinate relationship in overseas market, several universities and institutes in Korea have performed collaborative works on the standardization of test method for photocatalytic activity concerning the selected application fields. This article deals with the process and the result for the method of testing photocatalytic sol or suspended powder using optical fiber. Currently, this method is intended for TiO₂, but can be applied for various photocatalytic raw materials that can be activated by visible light and solar irradiation.
유동식(Yu Dong-Sik),주현규(Joo Hyun-Ku),하진욱(Ha Jin-Wook) 한국산학기술학회 2005 한국산학기술학회논문지 Vol.6 No.4
The degradation of IPA according to coating conditions was examined by TiO₂/P-25-coated POF. In the photoactivity of TiO₂-coated POF, ethanol solvent was higher activity than other solvents. Inorganic(KR-400), organic(A-9540) and inorganic · organic hybrid(GPTMS, TMOS) resins were used as binder. Organic binder(A-9540) showed the highest activity for degradation of IP A, but organic binder was decomposed by TiO₂. Inorganic binder had lower binder ability than others, and lower adhesive than organic binders. In TMOS as inorganic· organic hybrid binder, activity of IPA degradation was decreased by addition of TMOS when the ratio of TMOS and P-25 was changed from 0.05 to 1.
심은정(Shim, Eun-Jung),박민성(Park, Min-Sung),허아영(Her, A-Young),주현규(Joo, Hyun-Ku),윤재경(Yoon, Jae-Kyung) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
The present works were performed that titanium foil was anodized in various dilution ratios of seawater and distilled water with 10V external voltage applied, then annealed at 450?C to obtain TiO₂ on the Ti substrate. The prepared samples were characterized by instruments (XRD, SEM, and photocurrent) and used to investigate rate of hydrogen production in photoelectrochemical cell as well as Cr(VI) reduction. As the results of experiments, the anodized TiO₂ in seawater electrolytes, which are ranged from 15 to 50 times dilution of seawater, was showed a relatively higher hydrogen production (ca. 97~110 umol/hr-cm²) and Cr(VI) reduction (ca. 95% reduction).
양극산화 TiO<sub>2</sub> 전극과 cross-linked P. furiosus 활용 물분해 수조제조
윤재경(Yoon, Jae-Kyung),박민성(Park, Min-Sung),허아영(Her, Ah-Young),심은정(Shim, Eun-Jung),주현규(Joo, Hyun-Ku) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
Anodized tubular titania (TiO₂) electrodes (ATTEs) are prepared and used as both the photoanode and the cathode substrate in a photoelectrochemical system designed to split water into hydrogen with the assistance of an enzyme and an external bias (solar cell). In particular, the ATTE used as the cathode substrate for the immobilization of the enzyme is prepared by two methods; adsorption and crosslinking. Results show that the optimized amount of enzyme is 10.98 units for the slurried enzyme, 3.66 units for the adsorbed one and 7.32 units for the crosslinked one, and the corresponding hydrogen evolution rates are 33.04, 148.58, and 234.88 umol/hr, respectively. The immobilized enzyme, specifically the chemically crosslinked one, seems to be much superior to the slurried enzyme, due to the enhanced charge-transfer process that is caused by the lower electrical resistance between the enzyme and the ATTE. This results in a greater number of accepted electrons and a larger amount of enzymes able to deal with the electrons.
광전류 향상을 위한 유기 전해질 활용 양극산화 된 TiO<sub>2</sub> 전극의 광활성 연구
심은정(Shim, Eun-Jung),허아영(Heo, Ah-Young),박민성(Park, Min-Sung),윤재경(Yoon, Jae-Kyung),주현규(Joo, Hyun-Ku) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
In this paper, TiO₂ nanotube is prepared and the preparation is influenced by electrochemical etching rate and chemical dissolution rate. Especially, the chemical dissolution rate is lowered as the length TiO₂ nanotube increases. Titanium foil were anodized at various bias or current such as 20V, 55V and 0.1A (bath temperature 25?C) in organic electrolytes (ethylene glycol, glycerol) and then annealed at 450?C and 650?C to obtain the crystallized tubular TiO₂ on the Ti foil. Higher efficiency (89.1%) for the Cr(VI) reduction was obtained with the prepared sample compared to that (20.9%) with the sample in 0.5% HF electrolyte earlier studied.
박상은,주현규,정희록,전명석,오정무,강준원 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.5
본 연구에서는 평판에 코팅된 광촉매와 자외선을 가지고 광화학적 방법으로 아세트알데히드를 CO_2로 완전히 분해하였다. 이러한 광화학적 아세트알데히드 분해 경향을 알아보기 위하여 Langmuir-Hinshelwood(L-H) 속도식을 활용하였다. 코팅 면적별로 초기농도를 변해가며 수행한 실험에서 얻은 상수값을 활용하여 시용 조건에서의 반응을 모델링 할 수 있었으며, 동일 초기농도와 빛의 세기에서는 면적이 클수록 반응속도가 증가하였고, 동일면적에서는 빛의 세기가 증가함에 따라 반응속도가 1차에서 0.5차로 변함을 확인하였다. 이 두 결과에 의하여 면적이 작아도 조사한 빛의 세기가 증가함에 따라 반응속도가 1차에서 0.5차로 변함을 확인하였다. 이 두 결과에 의하여 면적이 작아도 조사한 빛의 세기에 따라 큰 면적의 경우보다 속도상수가 큰 영역의 존재가능성이 제시되었으며, 실험적으로 이러한 결과를 얻을 수 있는 반응면적과 빛의 세기 영역이 확인되었다. 광화학 반응에서는 빛의 세기 및 코팅면적이 반응속도에 가장 핵심적인 영향인자이며, 두 인자의 적절한 조화는 시너지효과를 유발할 수 있음을 결론지었다. In this study, the photocatalytic degradation of acetaldehyde into CO_2 with coated photocatalyst on the flat substrate was conducted. To obtain the detailed characteristics of the reaction the Lanmuir-Hinshelwood kinetics was applied. Modelling of the reaction was successfully achieved with the aid of constants(k_(L-H), K) extrapolated from the experiments. Reaction rates increased with increased coated area under the same initial concentrations and light intensities. The order of rate, however, changed first to zero with increased light intensity and the same coated area. Those two results brought an issue that at certain light intensity a less-coated area may result in a higher rate, which was finally identified experimentally in this study. The light intensity and the coated area are the most critical factors in photocatalysis, the optimal combination of which can show the synergy.
TiO2 가 코팅된 광섬유 광화학반응기를 이용한 C2Cl4 의 기상중 광촉매분해
김종순,이태규,오정무,문일,주현규,정희록,윤우석 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.3
TiO₂(Degussa P-25)가 코팅된 optical fiber reactor(OFR) system을 이용하여 C₂C1₄(Perchloroethylene, PCE)의 기상중 광촉매분해 반응을 검토하였다. PCE의 광촉매분해 반응은 optical fiber에 코팅된 TiO₂박막의 두께에 크게 영향을 받았다. 코팅에 사용된 TiO₂ 슬러리의 농도를 5 wt%조절하여 TiO₂ 박막의 두께를 약 600 ㎚로 하였을 때 광촉매활성이 가장 높았다. 이것은 광촉매가 코팅된 광섬유시스템에서 빛의 이용을 효율적으로 할 수 있는 TiO₂의 두께가 존재한다는 것을 의미한다. 빛의 세기 변화(300W, 600W, 900W)에 따른 PCE의 분해효율은 조사된 영역에서 빛의세기의 증가에 대하여 선형적으로 증가하였다. 기상중 PCE의 광촉매분해에 있어서의 중간생성물은 CCl₄, CC1₃COCl(Trichloroacethyl chloride, TCAC), COCl₂로 나타났으며 이 때의 반응기구에 대하여 검토하였다. Photocatalytic degradation of perchloroethylene(C₂C1₄, PCE) in the gas-phase was investigated by using TiO₂ coated optical fiber. The photocatalytic activities of TiO₂in the optical fiber reactor system depended on the thicknesses of TiO₂ films coated on optical fiber. The highest photocatalytic activity was obtained from the 5 wt% TiO₂ slurry and the thickness of the TiO₂ films prepared by this concentration was ca. 600 ㎚. This thickness could be related with the propagation of the light from the core of the optical fiber to TiO₂, films. The photocatalytic degradation rates of PCE increased linearly with the increase of light intensity within the investigated range (300W, 600W, 900W). Reaction mechanism of PCE in the gas-phase photocatalytic reaction was also postulated from the result that CC1₄, CCl₃COCl (Trichloroacethyl chloride) and COC1₂ were found as intermediates.