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TiO2 광촉매를 이용한 수용액 내의 벤즈알데히드의 광분해반응
최경희 ( Choe Gyeong Hui ),안병준 ( An Byeong Jun ),장원길 ( Jang Won Gil ),신형식 ( Sin Hyeong Sig ),양오봉 ( Yang O Bong ) 한국공업화학회 2003 공업화학 Vol.14 No.7
자외선 조사하에서 TiO₂를 촉매로 하여 벤즈알데히드의 광촉매 분해반응을 행하였다. 침전법에 의하여 제조된 여러 가지 TiO₂촉매의 활성을 비교하였고 반응조건에 따른 광분해 활성을 조사하였다. 벤즈알데히드의 초기농도가 6 ppm일때 P25촉매가 가장 우수하였으며, 광촉매량을 1~10 g/L로 변화시킨 결과 5 g/L에서 6 h 후에 96%의 제거율로 최대를 나타냈다. 100%의 아나타제로된 P101과 P102 촉매는 P25보다 비표면적이 4배 이상이었으나 벤즈알데히드의 분해 활성은 P25 보다 낮았다. 벤즈알데히드의 분해 메카니즘을 규명하기 위한 in-냐셔 FT-IR 특성 분석 결과 TiO₂ 표면에 가스 상 O₂로부터 반응종인 O^(-)(ads)과 OH radical이 형성되고, TiO₂에 흡착된 벤즈알데히드가 O^(-)(ads)의 공격을 받아 벤젠고리가 끊어져 알코올이 형성되며, 알데히드 → 카르복시산 → nCO₂ + nH₂O으로 완전 산화되는 광산화 반응 mechanism을 제안할 수 있었다. Photocatalytic degradation of benzaldehyde in aqueous phase has been investigated with various TiO2 catalysts under UV irradiation. Photocatalytic activities of p25(Degussa) and TiO₂ (P101 and P102) prepared by a precipitation method were studied as a function of reaction condition. The maximum degradation rate, 96% of benzaldehyde (initial concentration 6 ppm) was achieved with 5g/L of P25 in the range of 1-10g/L photocatalyst. P101 and P102 TiO₂ exhibit lower activity than P25 even though these have 100% anatase phase and about 4 times higher specific surface area than P25. By in-situ FT-IR study, we could propose the photo-degradation mechanism of benzaldehyde as following sequence : at first, O^(-)(ads) and OH radical were formed from oxygen gas on TiO₂; alcohol was formed due to the cession of aromatic ring which was attacked by O^(-)(ads); again oxidized to aldehyde, carboxylic acid and finally to carbon dioxide and water.
우리나라 1개 농촌 지역 주민의 질병상태에 관한 조사 : 경기도 양주군 수동면 Su-Dong Myun, Yang-Ju Gun, Kyung-Gi Do
이옥엽,박순복,원규숙,이내숙,등영문 이화여자대학교 의과대학 1979 梨花醫學誌 Vol.- No.11
A study on the status of disease in a Korean rural Community, Su-Dong Myun, Yong Ju Gun, Kyung-Gi Do was carried out from December, 28 1978 to January, 19 1979 through analizing the meclical records of Su-Dong Health Subcenter during the period september, 1977 to August, 1978 and following results were obtained. 1. New cases of out patients were 5,695 composed of 49.1% male and 50.9% female during the study period. 2. Cumulative cases of out patients were 9,956 composed of 56.4% male and 43.6% female during the study period. 3. Annual morbidity rate was 908.6 per 1,000 for male and 986.4 for female and average annual morbidity rate was 946.6 per 1,00 population. 4. The highest morbidity rate was 3,660.0 as composed of aged 0∼4, the lowest was 498.4 as composed of aged 10∼14 per 1m000 population per year. 5. Following was the order of five major disease which were classified with I.C.D. ① Diseases of the respiratory system : 33.4% ② Diseases of the digestive system : 21.5% ③ Diseases of the skin and subcutaneous tissue : 15.4% ④ Diseases of the nervous system and sense organs : 7.9% ⑤ Accidents, poisonings and violence : 9.4% 6. The visiting rate in the health subcenter were 2.01 for male, 1.44 for female and the average 1.75 per each out patient. 7. Average medical fee per new case was 653±510 won and average cumulatived fee per case was 923±833 won. 8. The distribution of out patients according to the cost of medical fee, 48.9% of total new patients was treated with less than 500 won and 93.3% of new patients was treated with less than 1,000 won.
권오준,이은정,최웅규,손동화,이석일,정연건,지원대 한국위생과학회 2002 한국위생과학회지 Vol.8 No.2
새로운 장류제품으로서 보리등겨의 이용방안을 모색하기 위하여 간장을 만들어 연구하였다. 보리로 제조한 간장의 갈색화는 점차적으로 증가 하였으며 완만한 변화를 보였다. 향기성분으로는 4-vinyl-2-methoxy-phenol, benzeneacetaldehyde, palmitic acid, 2-furancatboxaldehyde, methyl-9, 12-octadecadienoate, di-(2-ethylhexyl)phthalate, diethyl phtalate, dibytyl-1,2-benzenedicatboxylate, 5-methyl-2-furancarboxaldehyde, 3,4-dimethyl-1h-pyrazole, phenylethyl alcohol, dioctyl-hexanedioate, dimethyl-1,2-benzenedicatboxylate, benzaldehyde, methional, 2-methoxy-phenol, n-furfurylidene-3-methylbutyl amine, 1-furfuryl-2-formyl pyrrole, tetradrcanoic acid, 5-methyl-pyrimidine, 4-methyl-5-hydroxymethyl-imidazole, maltol, 5-(5-methyl-2-furanyl)methyl-2-furancarboxaldehyde 순으로 높은 함량을 차지 하였다. For investigation of new utilization as jang-products, kanjang was prepared using barely bran. This study was conducted to investigate flavor components of kanjang during fermentation time. The optical density was gradually increased. Among the flavor components identified in kanjang made with barley bran, the contents of 4-viny1-2-methoxy-phenol was the most in quantity followed by benzeneacetaldehyde, palmitic acid, 2-furancarboxaldehyde, methyl-9,12-octadecadienoate, di-(2-ethylhexyl)phthalate, diethyl phtalate, dibutyl-1,2-benzendicarboxylate, 5-methyl-2-furancarboxaldehyde, 3,4-dimethyl-1h-pyrazole, phenylethyl alcohol, dioctyl-hexanedioate, dimethyl-1,2-benzenedicarboxylate, benzaldehyde, methional, 2-methoxy-phenol, n-furfurylidene-3-methylbutyl amine, 1-furfuryl-2-formyl pyrrole, tetradecanoic acid, 5-methyl-pyrimidine, 4-methyl-5-hydroxymethyl-imidazole, maltol and 5-(5-methyl-2-furanyl)methyl-2-furancarboxaldegyde.