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RISS 인기검색어
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- 저자 : 양천희(Chun Hoi Yang) (검색결과 2 건)
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xTiO2 - y SiO2 광촉매에 의한 유기물의 광분해
양천희(Chun Hoi Yang),이철우(Chul Woo Lee),홍필선(Phil Sun Hong),이원묵(Won Mook Lee) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.1
TiO₂ and x TiO₂- y SiO₂ system photocatalysts were developed by sol-gel method based on the change of production parameters, and their structure of crystallization and the specific surface area were measured. Considering the efficiency of the ethanol and phenol degradation using the catalyst, the conclusions were obtained as follows: ①. By means of X-ray analysis of TiO₂ powder that is obtained from water and Titanium alkoxide with various molar ratios, it is shown that crystal structure of anatase type is a dominating structure and, on the other hand, the structure of rutile also partly exists. The specific surface area is at its maximum value at R=6, which is the molar ratio of water vs. alkoxide, whereas its value goes down as the molar ratio increases. ②. xTiO₂- y SiO₂ system photocatalysts were developed from Titanium and Silicon alkoxide by a hetero-condensation process. The increase of SiO₂ contents causes the decrease of the degree of crystallization of the gel, whereas the specific surface area preferentially increases. It is shown that more than 90% of ethanol and phenol are degraded when reaction time is about three and an hours, and the maximum degradation rate of ethanol and phenol is shown in 60TiO₂-40SiO₂ catalyst.
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원자가 조절에 의한 Cr_2O_3센서의 Trimethylamine 감지특성
양천희 한밭대학교 산업과학기술연구소 1993 논문집 Vol.1 No.-
To develop a new type of semiconductor gas sensors capable of testing freshness of fish, attempts were made enhance the sensitivity to trimethylamine(TMA) by modifying the carrier concentration of metal oxides by means of the valency control method. The TMA sensitivity of Cr_2O_3 was markedly improved by partial substitution with 5mol% Ti^4+ ions for the Cr^3+ sites. These facts suggest that the sensitivity can be enhanced by reducing the carrier concentration of the oxides.
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