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주창식,이회근,정용옥,천재기,황덕기 ( Chang Sik Ju,Hwae Gyon Lee,Yong Ok Jeong,Jae Ki Chun,Duk Ki Hwang ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.4
Zinc oxide fine particles were prepared from aqueous solutions of zinc nitrate in the presence of hexamethylenetetramine by homogeneous precipitation method. The rate of conversion change and the equilibrium conversion of zinc increased with the increase in R values and temperature, and with the decrease in initial pH of the solutions but initial concentration of zinc had only minor effect on them. Various shapes of zinc oxide fine particles were formed in relation to the precipitation conditions such as, concentrations of zinc nitrate and hexamethylenetetramine, temperature, pH of initial solution and aging time. The initial microcrystalline particles are approximately spherical with an average size of 1 ㎛, but they formed embryonic particles by coupling together and grew up. Spherical particles with a relatively narrow size distribution could be obtained when the concentration of zinc ion and R value were both high.
주창식,구준표 ( Chang Sik Ju,Jun Pyo Ku ) 한국공업화학회 1997 응용화학 Vol.1 No.1
W/O micro-emulsions were made of zinc nitrate aqueous solution with HMTA and kerosine in the presence of Span #80, and zinc oxide was precipitated in W/O micro-emulsions. The shape, size and particle size distribution of zinc oxide produced were measured by SEM and Particle Size Analyzer. The effects of process parameters on the physical properties of zinc oxide were experimentally examined. Spherical fine zinc oxide particle with the average diameter of 0.1 - 1 ㎛ were obtained in W/O micro-emulsions, even if the initial zinc concentration of precipitating solutions and conversion were high.
목질계 활성탄을 이용한 수중의 2,4-Dinitrophenol 흡착 제거
주창식 ( Chang-sik Ju ),이민규 ( Min-gyu Lee ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.5
The removal characteristics of 2,4-dinitrophenol (2,4-DNP) from an aqueous solution by commercial Wood-based Activated Carbon (WAC) have been studied. The effects of various experimental parameters were investigated using a batch adsorption technique. The adsorption capacity of 2,4-DNP by WAC increased with a decrease in the dosage and particle size of WAC, temperature and the initial pH of the solution, and increased with an increase in the initial concentration of the solution. The adsorption equilibrium data were best described by the Redlich-Peterson isotherm model. The maximum adsorption capacities of 2,4-DNP by WAC were 573.07 mg/g at 293 K, 500.00 mg/g at 313 K, and 476.19 mg/g at 333 K, decreasing with increasing temperature. The kinetic data were well fitted to the pseudo-second-order model, and the results of the intra-particle diffusion model suggested that the adsorption process was mainly controlled by particle diffusion. The thermodynamic analysis indicated that the adsorption of 2,4-DNP by WAC was an endothermic and spontaneous process.
분리기술 열역학 : 지지막을 이용하는 회분 액막 추출기에 의한 수용액 중의 아연이온 분리
주창식(Ju Chang Sik),천재기(Cheon Jae Kee),하홍두(Ha Hong Doo) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.1
Separation of zinc ion from aqueous solutions by batch liquid membrane permeator with two micro-porous films was studied. The permeator consisted of a liquid membrane and two cells for aqueous solutions. The liquid membrane consisted of D₂EHPA(di-2-ethylhexyl-phosphoric acid), diluted to 30 vol% with kerosine and trapped between two micro-porous hydrophilic films, as the carrier. This liquid membrane separated two aqueous solutions, one of which was the extraction solution containing zinc ion and the other of which was the stripping solutions consisting of H₂SO₄solution. The permeator separated zinc ion from aqueous solutions effectively. The effect of operating parameters on the distribution coefficient of zinc ion and separation velocity of zinc ion were examined on the basis of the experimental results.
제주 화산석으로부터 합성한 Na-A 제올라이트에 의한 Cu 이온의 흡착 특성
주창식 ( Chang-sik Ju ),이창한 ( Chang-han Lee ),이민규 ( Min-gyu Lee ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.5
The adsorption characteristics of Cu ions were studied using the zeolite Na-A synthesized from Jeju volcanic rocks. The effects of various operating parameters such as initial concentration of Cu ions, contact time, solution pH, and solution temperature were investigated in batch experiments. The adsorption of Cu ions by Na-A zeolite was fitted well by pseudo-second-order kinetics and the Langmuir isotherm model. The maximum adsorption capacity determined using the Langmuir isotherm model was 152.95 mg/g. In addition, the adsorption of Cu ions by zeolite Na-A was primarily controlled by particle diffusion model in comparison with the film diffusion model. As the temperature increased from 303 K to 323 K, ΔG˚ decreased from -2.22 kJ/mol to -3.41 kJ/mol, indicating that the adsorption of Cu ions by Na-A zeolite is spontaneous process.
균일용액침전법에 의한 산화아연 제조공정에서 침전조건이 입자형상 및 입도분포에 미치는 영향
주창식(Chang Sik Ju),이민규(Min Gyu Lee),홍성수(Seong Soo Hong) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.5
Experimental research was performed to develop an effective process for manufacturing monodispersed spherical zinc oxide fine particles by homogeneous precipitation. As the R value(molar ratio of HMTA to zinc nitrate), initial pH of the precipitating solutions and precipitation time decrease, the zinc oxide particles produced have a narrower particle size distribution. Short precipitation times lead to low yields of zinc oxide, however, yields could be increased significantly, without serious change in particle shape or size distribution, by introducing ethanol into the precipitation solutions.
주창식 ( Chang Sik Ju ),정상구 ( Sang Gu Jeong ),나석은 ( Seok En Na ),김시영 ( Si Young Kim ),김석현 ( Scok Hyeon Kim ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.2
TiO2 powders were prepared from titanium (IV) sulfate (Ti(SO4)2) solution using ammonia solution at low reaction temperature (80~100 oC) and atmospheric pressure by hydrothermal precipitation method without calcination. The effect of reaction conditions, such as reaction temperature, initial concentration of titanium (IV) sulfate (Ti(SO4)2) solution, pH of mixture solution and the physical properties of the prepared TiO2, such as crystallite structure, crystallite size were investigated. The photocatalytic activity of prepared TiO2 was tested by the photolysis of brilliant blue FCF (BB-FCF) under the UV and the analysis of UV-VIS diffuse reflectance spectroscopy (DRS). The physical properties of prepared TiO2 were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence spectrometer (PL), particle size distribution measurements. The crystallite size and crystallinity of prepared TiO2 increased with increasing titanium (IV) sulfate (Ti(SO4)2) concentration, but photocatalytic activity decreased. The crystallite size decreased with increasing pH of mixture solution, but photocatalytic activity increased. The crystallinity and photocatalytic activity increased with increasing reaction temperature. The results showed that anatase type TiO2 could be prepared by hydrothermal precipitation method using titanium (IV) sulfate (Ti(SO4)2) solution and ammonia solution at low reaction temperature and atmospheric pressure without calcinations
TTA와 TOPO를 이용한 수용액 중의 리튬이온 용매추출
주창식 ( Chang Sik Ju ),이전규 ( Jeon Kyu Lee ),정상구 ( Sang Gu Jeong ),구수진 ( Su Jin Koo ),김시영SiYoungKim 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.1
For the purpose of development of the extraction process of lithium ion from concentrated water eliminated from desalination process, an experimental research on the solvent extraction of lithium ion from aqueous solutions was performed. The effects of operating parameters, such as concentration of extractant, ratio of extracting solution/aqueous solution, pH of aqueous solution, were examined. The effect of sodium chloride, the major component of sea water, was also examined. Lithium ion in aqueous solutions of pH=10.2~10.6 adjusted by ammonia solution was most effectively extracted by extracting solution composed of 0.02 M TTA and 0.04 M TOPO in kerosine. The addition of sodium chloride in lithium aqueous solution significantly interfered the extraction of lithium ion.
RESS 공정에 의한 griseofulvin 미세입자의 제조
주창식(Chang Sik Ju),천재기(Jae Kee Cheon),이석희(Seok Hee Lee),홍성수(Seong Soo Hong),김홍룡(Hong Lyong Kim),우기주(Ki Ju Woo) 한국공업화학회 2002 공업화학 Vol.13 No.1
초임계 유체를 이용하여 의약품 입자의 크기와 형상을 제어하는 기술 개발 연구의 일환으로, RESS 공정을 사용하여 griseofulvin의 미세입자를 제조하는 실험을 행하였다. 초임계 유체는 CO_2를 사용하였고, 팽창관으로는 orifice disk와 capillary nozzle을 사용하였다. 침출온도와 침출압력 등 통상적으로 중요시되는 조작변수들은 물론, 팽창관의 종류와 형태, 특히 결정화 매체의 종류 및 결정화조 내부로 유입되는 질소 기류가 생성되는 griseofulvin 미세 입자의 크기와 형상에 미치는 영향을 실험적으로 조사하였다. 결정화 매체로 수용액을 사용하면 대기를 사용한 경우보다 생성되는 입자의 크기와 결정성이 증가하였으며, 1 vol%의 Tween 80 수용액을 사용한 경우에 입자간의 응집이 최소가 되는 것을 알았다. 팽창관 주위로 고온의 질소 기류를 유입시키면 매우 미세한 입자를 얻을 수 있었다. For the purpose of development of a supercritical process, controlling the shape and size of the pharmaceutical products, we performed experiments on the RESS process preparing griseofulvin fine particles. Supercritical fluid was CO_2, and orifice disk and capillary nozzle were adapted as expansion devices. Besides leaching temperature and pressure, which are rhe major operating parameters for the common researches in RESS process, we examined the effect of crystallization media and introduction of hot N_2 stream to the crystallization unit on the shape and size of griseofulvin fine particles. When supercritical griseofulvin solutions were expanded into aqueous solutions, size and crystallinity of the particles increased compared to those expanded into atmosphere. Our results showed that very fine griseofulvin particle could be obtained by introducing hot N_2 stream to the atmospheric crystallization unit.