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암모니아성 질소(NH_4^+-N)제거를 위한 제올라이트성 물질의 제조
류태공,류재춘,한명식,김철규,김영호,양현수 忠南大學校 産業技術硏究所 2002 산업기술연구논문집 Vol.17 No.2
The objectives of this study were to synthesize high ion-exchangeable zeolitic materials prepared from coal fly ash and to determine the adsorption capacities for the removal of NH_4^+4-N in wastewater For comparison. NH_4^+-N adsorption capacities of commercial, natural, and synthetic(4A type, Si0_2/Al_2O_3=1.98. Na_2O/SiO_2=1.54. H_2O/Na_2O=46.95) zeolites were investigated at the same condition. Zeolitic materials were prepared from coal fly ash by hydrothermal reaction with various NaOH concentrations at the reaction time of 4h and the reaction temperature of 100℃. It showed that the zeolitic material prepared at a 4M-NaOH concentration had the most NH_4^+-N adsorption capacity. Theremoval efficiency of NH_4^+-N on the zeolitic material was little difference compared with those on natural and commercial zeolites, though it was lower than that on a synthetic zeolite(4A type). As a result, it is expected that the prepared zeolitic material could be applicable to adsorbent for the NH_4^+-N removal in wastewater.
Ryu, Seong Ho,Shin, Tae Joo,Gong, Tao,Shen, Yongqiang,Korblova, Eva,Shao, Renfan,Walba, David M,Clark, Noel A,Yoon, Dong Ki Published by the American Physical Society through 2014 Physical review. E, Statistical, nonlinear, and so Vol.89 No.3
<P>We have identified a metastable liquid-crystal (LC) structure in the de Vries smectic-A* phase (de Vries Sm-A*) formed by silicon-containing molecules under certain boundary conditions. The phase transition with the metastable structure was observed in a LC droplet placed on a planar aligned substrate and LCs confined in the groove of a silicon microchannel. During the rapid cooling step, a batonnet structure was generated as an intermediate and metastable state prior to the transition that yielded the thermodynamically stable toric focal conic domains. This distinctive behavior was characterized using depolarized reflection light microscopy and grazing incidence x-ray diffraction techniques. We concluded that the silicon groups in the molecules that formed the de Vries phase induced the formation of layered clusters called cybotactic structures. This observation is relevant to an exploration of the physical properties of cybotactic de Vries phases and gives a hint as to their optoelectronic applications.</P>
Characteristics of Porous Ceramic Carriers made from Fly Ash for Immobilization of Microorganisms
Ryu, Jae Chun,Ryu, Tae Gong,Yoo, Sung Joon,Hwang, Joon Young,Kim, Young Ho,Yang, Hyun Soo 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.6
The purpose of this study is to develop the porous ceramic carrier made from fly ash for immobilization of microorganisms which can be applied to the effective removal of nitrogen in wastewater. For the purpose, attempts were carried out to investigate the effects of pore structure in the prepared carrier on the immobilization of microorganisms and to determine the optimum conditions for preparation of the carrier. And the surface of the prepared camers was treated with NaOH solution at 100% for 4 hrs to provide the cation exchange capacity by the transformation of a fly ash into a zeolite. As a result, we could control the porosity and pore size of the carrier by varying the amount and particle size of polyethylene added, respectively. The number of immobilized microorganisms increased with the pore volume of the appropriate size for colonization of microorganisms. And it seems that the immobilization capacity depends on the pore size rather than the porosity. The result also showed that immobilization capacities of the prepared carriers were about 3 times as high as the commercial carrier. The carrier which was treated with 4M NaOH solution at 100% for 4 hrs showed higher cation exchange capacity than the natural zeolite without the change of bulk shape. It is expected that the prepared carrier can he effectively applied to the removal process of nitrogen in wastewater.
Response regulator dr1558이 발현된 재조합 대장균을 이용한 목재 가수분해물로부터 poly(3-hydroxybutyrate)의 생산
공류경(Ryu-gyoung Gong),최준호(Jun-ho Choi),이재원(Jae-won Lee),김태완(Tae Wan Kim),최종일(Jong-il Choi) 한국생물공학회 2020 KSBB Journal Vol.35 No.2
In this study, wood hydrolysate was added in MR medium for the economical production of poly (3-hydroxybutyrate) by recombinant Escherichia coli. When response regulator dr1558 from Deinococcus radiodurans was overexpressed along with PHB biosynthesis genes, recombinant E. coli XB (pKM212_CnCAB+pRadGro_dr1558) had higher cell concentration and PHB content compared to control strain E. coli XB (pKM212_CnCAB+ pRadGro). From the transcriptional analysis by quantitative real time PCR, some genes involved in TCA cycle and PHB biosynthesis were overexpressed in E. coli XB (pKM212_CnCAB+pRadGro_dr1558). This results will be useful for production of biochemicals from cheap hydrolysate by fermentation process.
Kim Byung-Su,Ryu Tae-Gong,Choi Jihyuk,Park Tae Jun,장한권,Yoo JeongHyun,Suh Chang-Youl,Cho Sung-Wook,Roh Kimin 한국자원공학회 2022 Geosystem engineering Vol.25 No.4
A vanadium electrolyte for energy storage is generally prepared by dissolving vanadium pentoxide (V2O5) in sulfuric acid using oxalic acid ((COOH)2) as a reducing agent. However, there is a disadvantage that the dissolution rate in the sulfuric acid solution of V2O5 is very slow. In this study, a new process for producing vanadium dioxide (VO2), which has the faster dissolution rate than V2O5 in sulfuric acid solution, was developed. Vanadium dioxide (VO2) could be used in the production of a vanadium electrolyte for energy storage. The process developed in the study has the advantages of being economical and simple as compared to the existing process for producing VO2 from V2O5 using hydrogen or carbon monoxide as a reducing agent.
Cha, Kwang-Seo,Yoo, Byoung-Kwan,Kim, Hong-Soon,Ryu, Tae-Gong,Kang, Kyoung-Soo,Park, Chu-Sik,Kim, Young-Ho John Wiley Sons, Ltd. 2010 International journal of energy research Vol.34 No.5
<P>Thermochemical two-step methane reforming, involving the reduction of metal oxide with methane to produce syngas and the oxidation of the reduced metal oxide with water vapor to produce pure hydrogen, was investigated over a Cu-ferrite/ZrO<SUB>2</SUB> (CFZ) medium, as a reactant for the redox reaction. To improve the reactivity of the CFZ medium, we considered the addition of Ni or Ce additive to the medium. The reduction behavior of the media in the syngas production step was examined by temperature-programmed reduction method. The reaction characteristics of the media by varying Ni or Ce additive content was evaluated in fixed bed reaction system with infrared heating under the temperature range of 700∼900°C. In addition, the repeated cyclic tests were performed to determine durability of the media. Copyright © 2009 John Wiley & Sons, Ltd.</P>