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Recent applications of the liquid phase plasma process
김상채,박영권,정상철 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.5
In this paper, the principle and application of plasma are briefly described, and in particular, the principle and practical application for plasma generated in liquid are introduced. Also, the research results of water treatment, synthesis of metal nanoparticle, synthesis of visible light-responsive photocatalyst, synthesis of energy material, and hydrogen gas production, which were tested using liquid phase plasma, are introduced. Various water pollutants were treated and hydrogen gas was produced using the strong chemical oxidizing species and ultraviolet rays in the plasma field generated in the reactant aqueous solution during the liquid phase plasma (LPP) process. The effects of plasma discharge conditions, dissolved oxygen concentration, pH value, photocatalytic behavior, as well as the properties of organic solutions on the LPP reaction were investigated experimentally and reported. Based on these previous studies, metal nanoparticles were synthesized using hydrogen atom radicals as well as the numerous electrons in the plasma field generated during the LPP process. Additionally, these studies indicate that visible light-responsive photocatalysts can be obtained when metal nanoparticles are precipitated in TiO2. They also provide evidence that metal nanoparticles can be precipitated in various carbon materials for application as electrodes in secondary batteries and supercapacitors. Therefore, the LPP process has been successfully applied in various fields given that it can be easily and conveniently used, and presently it is being applied in several new fields and many possibilities for its future application are expected.
김상채,박영권,김병훈,김항건,이원준,이헌,정상철 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.3
A high-performance lithium ion battery (LIB) electrode was prepared by precipitating tin oxide nanoparticles on graphene powder by the liquid phase plasma (LPP) method. The particles generated by the LPP reaction are spherical SnO2 nanoparticles with a size of 5-10 nm, as confirmed by a variety of analytical devices. The quantity of SnO2 nanoparticles partially aggregated on the graphene sheet surface increases as the initial concentration of the tin precursor increases. The SnO2/graphene nanocomposites (SGNC) electrodes prepared by the LPP method demonstrated improved cycling stability and reversible lithium storage capacity as compared to the bare graphene electrode. The precipitated tin oxide improves the lithium storage capacity, but excess tin oxide nanoparticles rather reduced the cycling stability.
김상채,김수현,박기환,곽윤근,Kim, Sang-Chae,Kim, Soo-Hyeon,Park, Kyi-Hwan,Kwak, Yun-Keun 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.5
In this work, a precies actuator which is capable of high positioning accuracy is developed. For estimation the dynamic behavior of the actuator, system modeling is performed by employing a stick-slip frection law. Dynamic characteristics over various types of driving input signals and vibraiton loci of the driving tip are examined by experiments. Phase differences between the input signals are applied, and the dynamic behavior of slider is investigated. From the simulation and experimental results, it is observed that the dynamic behaviors from the simulation results agree fairly well to those of the experimental results. Thisindicates that the model developed in this work is applicable to other precision mechanisms in which a friction farce is as improtant factor for actuation.
촉매산화법을 이용한 휘발성 유기화합물(VOCs)의 제거
김상채,서성규 木浦大學校 工業技術硏究所 1999 工業技術硏究誌 Vol.9 No.-
Catalytic oxidation of VOCs(benzene, toluene, xylene) was investigated at atmospheric pressure in a fixed bed flow reactor system over transition metals/ALO-6 catalysts. The order of catalytic activities for the complete oxidation of toluene was Cu>Mn>Cr>Fe>V>Mo>Co>Ni>Zn for 15% transition metals/ALO-6 catalyst system. Increasing the calcination temperature resulted in decreasing the specific surface areas of catalysts, subsequently the catalytic activity. The loading of Cu on ALO-6 had a great effect on the catalytic activity and 5% Cu/ALO-6 catalyst showed higher catalytic activity contributed to the uniformly distributed active sites. Benzene, toluene and xylene were completely oxidized to carbon dioxide over 5% Cu/ALO-6 catalyst at over 350℃ and 4.5 g-cat hr/g-mole. As the concentration of reactant increased, the catalytic activity decreased due to self-poison of reactants.
Rhizosphere 토양과 Non-rhizosphere 토양에서 Pyrene의 분해속도 비교
김상채,이의상,서성규 한국지하수토양환경학회 1998 지하수토양환경 Vol.3 No.2
Pyrene은 보통 석유류로서 오염된 지역에서 쉽게 발견된다. 이 화합물은 생물학적으로 난분해성물질이므로 오염지역에서 장시간 존재한다. 세 종류의 토양(rhizosphere soil, non-rhizosphere soil, sterilized soil)에서 pyrene의 분해속도를 조사하기 위하여 microcosm실험을 수행하였다. Pyrene 농도감소속도는 rhizosphere soil)non-rhizosphere soil>sterilized soil 순서로 증가하였다. 또한 뿌리 유출물을 모사한 유기산의 첨가는 pyrene의 농도감소에 큰영향을 미치지 않았으나 pyrene농도감소 속도와 토양미생물의 증가는 좋은 상관관계를 보여주었다. 따라서 본 연구에서는 미생물의 밀도가 높은 rhizosphere 토양에서 pyrene의 생물학적 분해가 효과적으로 진행되는 것으로 나타났다. Pyrene is a common petroleum contaminant. This compound is recalcitrant to biological degradation and persists long in contaminated environments. A microcosm experiment was conducted to investigate the degradation rate of pyrene in three different of soil : rhizosphere soil ; non-rhizosphere soil ; and sterilized soil. The degradation rate followed the order of rhizosphere soil)non-rhizosphere soil)sterilized soil. And the rate did not change significantly when organic acids commonly found in the rhizosphere were added to each soil but it seemed to be well related to the increase of the number of microorganisms. Overall, it appears that pyrene is degraded faster in the rhizosphere soil which has the higher microorganism density.
NaCl / ZnO / α- Al2O3 촉매상에서 메탄의 Oxidative Coupling 의 속도론적 고찰
김상채,서호준,선우창신,유의연 ( Sang Chai Kim,Ho Joon Seo,Chang Shin Sunwoo,Eui Yeon Yu ) 한국공업화학회 1992 공업화학 Vol.3 No.2
NaCl(30wt%)/ZnO(60wt%)/α-Al_2O_3 촉매상에서 메탄의 oxidative coupling 반응의 속도식을 연구하여 활성 산소종에 관하여 고찰하였다. 반응온도 650℃에서 750℃까지 메탄의 전화율 10%미만의 범위에서 메탄과 산소의 분압을 변화시켜 가면서 메탄의 전환속도를 측정하여 속도식을 검증하였다. 제안된 메틸라디칼의 생성반응은 Langmuir-Hinshelwood형 반응기구를 따른다. 촉매표면의 서로 다른 활성점에 흡착된 메탄 분자와 산소분자가 반응하여 메틸라디칼이 생성되는 반응이 속도결정단계이며, 이때 활성화 에너지는 약 39㎉/㏖이었다. 메탄의 C-H 결합의 해리에 관여하는 산소종은 표면상의 이원자 산소인 O_2^(2-)나 O_2^-로 제시할 수 있었다. The kinetics for the oxidative coupling of methane over NaCl(30wt%)/ZnO(60wt%)/α-Al_2O_3 catalyst was investigated, and then the active oxygen species were discussed. The conversion rate of methane was measured at the atmospheric pressure with various combinations of partial pressure of methane and oxygen at temperature range of 650℃∼750℃, at conversions less than with 10%. These rate data were then used to verify the proposed Langmuir-Hinshelwood kinetic equation. The rate limiting step appeared to be the formation of the methyl radicals by the reaction of the adsorbed methane and the adsorbed oxygen, which were adsorbed on the different active sites of the catalyst. The activation energy of the methyl radical formation was estimated to be ca. 39㎉/㏖. From the kinetic studies, the oxygen species responsible for the formation of methyl radicals was proposed to be diatomic oxygen such as O_2^(2-) or O_2^ on the surface.