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2009년 서울지역 유통 한약재의 이산화황 잔류실태 분석
윤용태,이성득,박애숙,신영,김화순,김유경,최병현 韓國藥用作物學會 2010 한국약용작물학회지 Vol.18 No.5
This study was conducted to investigate the content of sulfur dioxide residues in medicinal herbs in Seoul in 2009. Sulfur dioxide in the samples were determined by Monnier-Williams's modified method. A total of 1,821 samples of 205 different types of herbs were collected from Kyung-Dong Herb markets and Oriental medicine hospitals in Seoul. Of these samples, 642 samples were domestic, and 1,179 samples were imported. Of the 1,821 samples, 61 (3.3%, 31 types) failed to meet the regulations for sulfur dioxide residues of KFDA in medicinal herbs. Among these 61 unsuitable samples, 17 (7 types) were domestic, and 44 samples (26 types) were imported. The content of sulfur dioxide in the domestic medicinal herbs ranged from 0 to 809 mg/kg, while those in imported medicinal herbs ranged from 0 to 4,481 mg/kg. Approximately 84.6% of the samples contained less than 10 mg/kg of sulfur dioxide and about 10.0% of samples contained more than 30 mg/kg of sulfur dioxide.
각 염으로 침착시킨 활성탕을 이용한 수중 Trichloroethylene의 제거에 관한 연구
김영규,윤용태 용인대학교 자연과학연구소 1996 自然科學硏究所論文誌 Vol.1 No.1
This study has been designed to conduct isotherm tests of Trichloroethylene with activated carbon with TiO₂, ZnO and TiO₂·ZnO and then to analyze the effect of the removal of Trichloroethylene using activated carbon coated with TiO₂. The results are as follows. 1. Adsorption capacity of activated carbon coated with TiO₂(T-3) was improved. It is reflected not only as an increase in Freundlich adsorption capacity value (k) but also as a decrease in Freundlich exponent value (1/n). 2. Adsorption capacity of activated carbon coated with ZnO (Z-3) was improved. It is reflected not only as an increase in Freundlidsorption capacity value (k) but also as a decrease in Freundlich exponent value (1/n). 3. Adsorption capacity of activated carbon coated with TiO₂·ZnO was not improved.
TiO₂로 침착시킨 활성탄을 이용한 유기화학물질의 제거에 관한 연구
鄭文鎬,尹鏞泰 서울大學校 保健大學院 1996 國民保健硏究所硏究論叢 Vol.6 No.2
This study has been designed to conduct isotherm tests of Trichloroethylene with activated carbon coated with TiO_2, ZnO and TiO_2·ZnO and then to analyze the effect of the removal of Trichloroethylene using activated carbon coated with 3,063 ㎍ TiO_2/g AC. The results are as follows. 1. Adsorption capacity of activated carbon coated with 3,063 ㎍ TiO_2/g AC was improved. It is reflected not only as an increase in Freundlich adsorption capacity value (k) but also as a decrease in Freundlich exponent value (1/n). 2. Adsorption capacity of activated carbon coated with 38,718 ㎍ ZnO/g AC was improved. It is reflected not only as an increase in Freundlich adsorption capacity value (k) but also as a decrease in Freundlich exponent value (1/n). 3. Adsorption capacity of activated carbon coated with TiO_2·ZnO was not improved. 4. Using activated carbon coated with 3,063 ㎍ TiO_2/g AC, the concentration of TCE by UV light was not changed. It is because of the effect of background organic material (methanol). 5. Using activated carbon coated with 3,063 ㎍ TiO_2/g AC, the concentration of Cl^- by UV light was not changed. It is also because of the effect of background organic material (methanol).
저온 습식 코팅법에 의한 유연 염료감응 태양전지용 광전극의 제작 및 특성 연구
윤용태,김영일 한국화상학회 2016 한국화상학회지 Vol.22 No.1
입자 크기가 약 16 및 5 nm인 두 다른 크기의 TiO2 나노입자들과 titanium tetraisopropoxide (TTIP) binder 와 ethanol 용매만으로 제조된 코팅액을 사용하여 130 oC 저온 열처리로 ITO/PEN substrate 위에 메조다공성 TiO2 박막들을 형성하였다. 이들 TiO2/ITO/PEN 박막들을 활용한 유연 염료감응 태양전지들을 제작하여 광변환 특성을 비교 연구하였다. 크기가 다른 두 TiO2 나노입자들을 각각 단독으로 사용하여 제작된 cell들의 경우에 크기가 16 nm 인 TiO2 나노입자 cell이 5 nm인 나노입자 cell에 비해 박막의 porosity가 훨씬 크고 같은 질량에서 표면적이 훨씬 넓어 광변환 효율이 훨씬 높으나 염료 흡착량에 대해 상대적으로 작은 광전류는 입자간의 연결성에 기인되며 큰 입 자에 작은 입자를 10% 정도 혼합한 경우에 표면적 증가와 함께 입자간의 연결성을 강화시켜 큰 입자 단독으로 제작 된 cell에 비해 광변환 효율이 크게 증가됨을 확인하였다. Mesoporous TiO2 thin films on ITO/PEN substrate were prepared from two substantially different sizes of TiO2 nanoparticles by low temperature heat treatment. Using these thin film electrodes, flexible dye-sensitized solar cells(DSSCs) were assembled and their photovoltaic characteristics were investigated. The cell of TiO2 film prepared from the larger nanoparticle of 16 nm showed, as expected, much better photoconversion effciency than that from the smaller nanoparticles of about 5 nm due to the increased porosity and surface area for the same amount of TiO2. However, the photocurrent for the former cell did not increase as much as the amount of the increased surface area compared with the latter cell, which means that the interconnectivity between the nanoparticles in the former cell became poorer than that of the latter cell. When TiO2 film was prepared by mixing the larger nanoparticles and the smaller ones in the ratio of 9:1, the prepared solar cell showed much better photoconversion efficiency than the cell with the larger particles only. This means that the smaller particles increased the interconnectivity between the larger particles by filling the void volume without decreasing the porosity and surface area of the TiO2 film.
저온 습식 코팅법에 의한 유연 염료감응 태양전지용 광전극의 제작 및 특성 연구
윤용태 ( Yong Tae Yoon ),김영일 ( Yeong Il Kim ) 한국화상학회 2016 한국화상학회지 Vol.22 No.1
입자 크기가 약 16 및 5 nm인 두 다른 크기의 TiO2 나노입자들과 titanium tetraisopropoxide (TTIP) binder 와 ethanol 용매만으로 제조된 코팅액을 사용하여 130 oC 저온 열처리로 ITO/PEN substrate 위에 메조다공성 TiO2박막들을 형성하였다. 이들 TiO2/ITO/PEN 박막들을 활용한 유연 염료감응 태양전지들을 제작하여 광변환 특성을 비교 연구하였다. 크기가 다른 두 TiO2 나노입자들을 각각 단독으로 사용하여 제작된 cell들의 경우에 크기가 16 nm인 TiO2 나노입자 cell이 5 nm인 나노입자 cell에 비해 박막의 porosity가 훨씬 크고 같은 질량에서 표면적이 훨씬넓어 광변환 효율이 훨씬 높으나 염료 흡착량에 대해 상대적으로 작은 광전류는 입자간의 연결성에 기인되며 큰 입자에 작은 입자를 10% 정도 혼합한 경우에 표면적 증가와 함께 입자간의 연결성을 강화시켜 큰 입자 단독으로 제작된 cell에 비해 광변환 효율이 크게 증가됨을 확인하였다. Mesoporous TiO2 thin films on ITO/PEN substrate were prepared from two substantially different sizes of TiO2 nanoparticles by low temperature heat treatment. Using these thin film electrodes, flexible dye-sensitized solar cells(DSSCs) were assembled and their photovoltaic characteristics were investigated. The cell of TiO2 film prepared from the larger nanoparticle of 16 nm showed, as expected, much better photoconversion effciency than that from the smaller nanoparticles of about 5 nm due to the increased porosity and surface area for the same amount of TiO2. However, the photocurrent for the former cell did not increase as much as the amount of the increased surface area compared with the latter cell, which means that the interconnectivity between the nanoparticles in the former cell became poorer than that of the latter cell. When TiO2 film was prepared by mixing the larger nanoparticles and the smaller ones in the ratio of 9:1, the prepared solar cell showed much better photoconversion efficiency than the cell with the larger particles only. This means that the smaller particles increased the interconnectivity between the larger particles by filling the void volume without decreasing the porosity and surface area of the TiO2 film.