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Synthesis of Fe-Mn Bimetallosilicate and Its Catalytic Performance on NO Decomposition
Kang, Misook Korean Society for Atmospheric Environment 1999 한국대기환경학회지 Vol.15 No.E
This study has been focused on NO conversion for metal-incorporated silicates(Fe-silicate, Mn-silicate, and Fe-Mn-bimetallosilicate) with a similar MFI type. Used metallosilicates were prepared by the rapid crystallization method. Their catalytic performance for the conversion of NO under excess O2(10%) condition with the addition of hydrocarbon of low concentration(1,100ppm n-C8H18) were investigated. As a result, the NO conversion on the Fe-Mn-bimetallosilicate was enhanced compared with on the Fe- or Mn-silicates. Furthermore, the performances for NO concentration on Fe-Mn-bimetallosilicate more increased with an increased in n-C8H18 concentration, a decrease in NO concentration, and an increase in O2 concentration.
Kang, Sora,Kwak, Byeong Sub,Park, Minkyu,Jeong, Kyung Mi,Park, Sun-Min,Kang, Misook Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.9
A new magnetic semiconductor material was synthesized to enable separation after a liquid-type photocatalysis process. Core@shell-structured $CuFeS_2@TiO_2$ magnetic nanoparticles were prepared by a combination of solvothermal and wet-impregnation methods for photocatalysis applications. The materials obtained were characterized using X-ray diffraction, transmission electron microscopy, ultraviolet-visible, photoluminescence spectroscopy, Brunauer-Emmett-Teller surface area measurements, and cyclic voltammetry. This study confirmed that the light absorption of $CuFeS_2$ was shifted significantly to the visible wavelength compared to pure $TiO_2$. Moreover, the resulting hydrogen production from the photo-splitting methanol/water solution after 10 hours was more than 4 times on the core@shell structured $CuFeS_2@TiO_2$ nanocatalyst than on either pure $TiO_2$ or $CuFeS_2$.
Misook Kang,Younghwan Im,Sora Kang,Byeong Sub Kwak,Kyoung Soo Park,Tae Woo Cho,Jin-Sik Lee 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
ZnO nanoparticles with three morphologies were synthesized by a hydrothermal route at 120 oC for 3 h in high alkaline aqueous solutions of LiOH, NaOH, and KOH. We analyzed them by X-ray diffraction (XRD), scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), cyclic voltammetry (CV), Zeta potential measurement, and impedance. XRD and SEM showed that the obtained ZnO nanoparticles had high purity and perfect crystallinity, and the morphologies of the particles prepared in the LiOH, NaOH, and KOH solutions showed nanoplate, nanobead, and nanorod shapes, respectively. CV showed that the nanoplate ZnO-LiOH and nanorod ZnO-KOH have superior electrochemical activity to that of the other ZnO nanostructures. As electrode materials of Ni/Zn redox batteries, the nanoplate ZnO-LiOH showed a significantly improved cycle stability after the 30th cycle compared to that of ZnO-NaOH and conventional ZnO with a mean discharge capacity of 153 mA h g−1, a cell efficiency of 93%, and higher discharge voltages of 1.9. In addition, during the charging/discharging cycles, the growth of zinc dendrite clusters could be suppressed, which resulted in an improvement in the cycle stability of the Ni/nanoplate ZnO-LiOH redox cell.
Methyl Orange Removal in a Liquid Photo-System with Nanometer Sized V/TiO₂ Particle
Kang, Misook,Choi, Dong-Hyuk,Choung, Suk-Jin 한국공업화학회 2005 Journal of Industrial and Engineering Chemistry Vol.11 No.2
This study focuses on the removal of methyl orange (sodium p-dimethylaminoazobenzene sulfonate), a representative dye compound, in a liquid photo-system using nanometer-sized V/TiO₂synthesized by commercial sol-gel method. The V/TiO₂particles exhibited a mixture structure of anatase and rutile with a particle size below 70 nm; the surface areas of V/TiO₂were large (15.0 m²/g) compared with that of pure(7.0 m²/g). The XRD pattern for V/TiO₂revealed that the vanadium component was substituted well into the titanium ion sites until it reached an amount of 5.0 wt%. The XPS result confirmed that V/TiO₂had a higher hydrophilic property than did pure TiO₂. In addition, when the vanadium component was added, new Brφnsted acid sites were generated. Based on these results, the photodecomposition of methyl orange in liquid reaction was enhanced over V/TiO₂ when compared to that over pure TiO₂, especially when using the 5.0 wt% vanadium addition sample. Furthennore, the photoactivity of V/TiO₂increased remarkably with H₂O: addition in an aqueous solution. From ion chromatogram data, NO₂^(-), NO₃^(-), CO₃^(2-) and SO₄^(2-) ions appeared as products of the methyl orange photodegradation. From the results, it could be suggested that complete photo-oxidation dominated in V/TiO₂relative to that in pure TiO₂.
강경원(Kang Kyungwon),문진석(Moon Jinseok),강병갑(Kang Byunggab),김보영(Kim Boyoung),김노수(Kim Nosoo),유종향(Yoo Jonghyang),신미숙(Shin Misook),최선미(Choi Sunmi) 한국한의학연구원 2008 한국한의학연구원논문집 Vol.14 No.2
The study was to investigate the agreement rate between the statistical diagnosis of pattern identification by discriminant analysis and the clinical diagnosis of pattern identification by medical specialist in obese patients with BMI ≥ 23. The agreement rate of deficiency of the spleen, phlegm-retention, deficiency of Yang, retention of undigested food, stagnation of liver Gi, and blood stagnation are 0.40, 0.33, 0.52, 0.76, 0.71, and 0.66, respectively and accuracy rate and prediction rate using linear discriminant function are 0.59 and 0.61, respectively. Therefore, the complementary management in CRF questionnaires and/or consultation from experts will improve the accuracy and prediction rate, which will be helpful for pattern identification of obesity by clinical experts.
강미숙 ( Misook Kang ) 한국로렌스학회 2020 D.H. 로렌스 연구 Vol.28 No.2
The marriage of Tom Brangwen and Lydia Lensky, the first generation of The Rainbow, comprises one of the major turning points in the structure of the novel which chronicles the lives of the three generations of the Brangwen family, setting them against the emergence of modern England. Even though Tom Brangwen ends up failing to develop himself in terms of the formal education and the mental consciousness, he, through his marriage, finally get to his singleness of self, that is, his venture into the unknown reality. With reference to some of A. Badiou’s notions, such as “events” and “the truth-process”, this article tries to discriminate the unique Lawrencean terms, power from will, thereby tracing the way Tom and Lydia escape from their own egos and ultimately achieve the true relatedness in marriage. Lydia’s first marriage as well as the turbulent history during the great revolution in Poland provides a backdrop against which the small region of Cossethay can be endowed with much greater significance even in the world history.
산화은/이산화티타늄 혼합물을 광촉매로 활용한 물/메탄올 분해 수소제조
김강민(Kang Min Kim),정경미(Kyung Mi Jeong),박노국(No-Kuk Park),이태진(Tae Jin Lee),강미숙(Misook Kang) 한국청정기술학회 2015 청정기술 Vol.21 No.4
본 연구에서는 효율적인 광 전기화학적 수소제조를 위하여 광촉매로써 상용화 촉매인 P25-티타니아와 합성한 AgxO를 적정 질량비로 혼합한 촉매를 사용하였다. AgxO는 일반적인 솔-젤법으로 합성하였으며, 은 용액의 안정화를 위해 합성과정 중에 수산화테트라메틸암모늄을 첨가하고 열처리 온도를 -5, 25, 50 ℃로 다양화시켜 세 가지 형태의 산화은을 얻었다. 합성한 AgxO의 물리화학적 특성은 X-선 회절분석법(XRD), 주사전자현미경(SEM), 자외선-가시선 분광광도계(UV-Visible spectroscopy), X-선 광전자 분광법(XPS)을 이용하여 확인하였다. 물/메탄올(무게 비 1:1) 혼합용액을 광분해 한 결과, 순수 P25-티타니아보다 AgxO가 첨가된 혼합촉매에서 현저히 높은 양의 수소가 발생하였다. 보조 산화제로써 H₂O₂를 첨가한 경우 그리고 AgxO의 합성온도가 50 ℃일 때 가장 높은 수소 제조효율을 나타내었다. 특히, 0.9 g의 P25-티타니아와 0.1 g의 AgxO (50 ℃)를 혼합한 촉매를 사용하였을 때 8시간 반응하는 동안에 13,000 μmol의 수소가 발생하였다. A photocatalyst which mixed by the commercialized P25-TiO₂ and a synthesized AgxO was used in an appropriate weight ratio to effectively produce hydrogen gas in this study. The AgxOs were synthesized with the conventional sol-gel method, and tetramethylammonium hydroxides were added at the synthesis process in order to stabilize the solutions, and then the solutions were heat-treated at the temperatures of -5, 25, and 50 ℃, resulted to obtain the three types of silver oxides. Physicochemical properties of the synthesized AgxOs were identified through X-ray diffraction analysis (XRD), scanning emission microscopy (SEM), ultraviolet-visible spectroscopy, and X-ray photoelectron spectroscopy (XPS). In the photolysis results of water/methanol (weight ratio 1:1) solution, the mixture of P25-TiO₂/AgxO exhibited a significantly higher hydrogen gases evolution, compared to that of pure P25-TiO₂. Additionally, the addition of H₂O₂ as an supplement oxidant and in AgxO synthesized at 50 ℃ improved the hydrogen production efficiency. In particular, the emitted hydrogen gases reached to 13,000 μmol during 8 hours when a mixed catalyst, AgxO of 0.1 g and P25-TiO₂ of 0.9 g, were used.