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MCM-41과 MCM-48 메조포러스 내에서 VOC와 수분의 불균일 흡착
서양곤 ( Yang Gon Seo ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.3
MCM-41 and MCM-48 were prepared by sol-gel method. Structural characteristics of MCM-41 and MCM-48 were investigated using X-ray diffraction, nitrogen adsorption and desorption. The adsorption equilibrium data were also obtained for seven pure vapors (acetone, benzene, cyclo hexane, hexane, methanol, MEK and toluene)at 300.15 K for different MCM-48 using a gravimetric method. Adsorption equilibria of various VOCs on MCM-41 and MCM-48 were classified as type IV in accord with IUPAC recommendations. To correlate the collected experimental data, the hybrid isotherm equations such as Langmuir-Sips and inhomogeneous DA were used.
생물화공 에너지 / 환경 : 세라믹 필터의 탈진설비의 최적화에 관한 연구
서양곤(Yang Gon Seo),최주홍(Joo Hong Choi) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.5
To optimize the pulse-jet cleaning system of porous ceramic filters applied to IGCC and PFBC, the effects of factors on the cleaning performance were investigated at a temperature of 298.15 K and pressure of 1 atm and 723.15 K and 20 atm, respectively. The diameter of nozzle, the size of diffuser throat and pulse-jet pressure were the main factors of pulse-jet system. In case of 298.15 K and l atm, the effective diffuser throat size was 2 to 3 ㎝ which depended on pulse-jet pressure, the diameter of nozzle 0.4 to 0.6 ㎝ and pulse-jet pressure 4 to 5 atm, respectively. In case of 723.15 K, 20 atm and the diameter of diffuser throat was 2.5 ㎝, the optimum diameter of nozzle was about 0.4 ㎝ and pulse-jet pressure 50 to 60 atm, respectively.
국부분자배향의 탄소 미세기공 구조에 대한 질소의 흡착 특성
서양곤,Seo, Yang Gon 한국청정기술학회 2022 청정기술 Vol.28 No.3
Grand canonical Monte Carlo 전산모사 방법에 의하여 77.16 K에서 국부분자배향 모델을 가지는 나노 기공 탄소 흡착제에 대한 질소의 평형 흡착량을 계산하였다. 국부분자배향 모델은 일정한 공간을 가지는 규칙적인 격자에 동일한 크기를 배열하였다. 국부분자배향 영역의 연속적인 평면의 직교(out-of-plane)의 제거에 의해 미세기공을 도입하였고, 기본구조단위의 기울임을 통해 기울어진 기공을 도입하였다. 이런 기공 구조는 틈새형 기공 구조보다 나노기공을 가지는 탄소계 흡착제의 흡착 연구에 보다 현실적인 모델이 된다. 또한 이들 기공 구조에 대해 기공도, 표면적 그리고 제한된 비선형 최적화 기법을 활용하여 기공크기분포에 구하였다. 또한 참고 자료로써 틈새형 기공에서의 등온 평형흡착량도 계산하였다. 틈새형 기공에서는 질소분자의 5배 이상의 기공에서 hysteresis 루프가 관찰되었고, 모세관 응축과 응축의 역과정인 증발이 한 압력에서 한 번에 일어났다. 국부분자배향 기공모델에서는 질소분자의 크기의 6배 큰 기공에서 기저 슬립면, armchair 슬립면 그리고 상호연결된 채널에서 각각 세 가지 연속적인 응축이 관찰되었다. 탈착 과정의 hysteresis 루프에서는 단일 또는 두 압력에서 응축의 반대인 증발이 관찰되었다. The adsorption equilibria of nitrogen on a region of nanoporous carbonaceous adsorbent with local molecular orientation (LMO) were calculated by grand canonical Monte Carlo simulation at 77.16 K. Regions of LMO of identical size were arranged on a regular lattice with uniform spacing. Microporosity was predominately introduced to the model by removing successive out-of-plane domains from the regions of LMO and tilting pores were generated by tilting the basic structure units. This pore structure is a more realistic model than slit-shaped pores for studying adsorption in nanoporous carbon adsorbents. Their porosities, surface areas, and pore size distributions according to constrained nonlinear optimization were also reported. The adsorption in slit shaped pores was also reported for reference. In the slit shaped pores, a clear hysteresis loop was observed in pores of greater than 5 times the nitrogen molecule size, and in capillary condensation and reverse condensation, evaporation occurred immediately at one pressure. In the LMO pore model, three series of local condensations at the basal slip plane, armchair slip plane and interconnected channel were observed during adsorption at pore sizes greater than about 6 times the nitrogen molecular size. In the hysteresis loop, on the other hand, evaporation occurred at one or two pressures during desorption.
수산화인회석에 의한 수용액으로부터 중금속 이온의 제거에 관한 연구
서양곤,이동근 ( Yang Gon Seo,Dong Keun Lee ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.3
Removal of divalent heavy metal ions, i.e., Pb^(2+), Cu^(2+), Zn^(2+) and Cd^(2+), respectively, from their chloride or nitrate aqueous solutions was studied by the addition of hydroxyapatite in a batch system. The isotherms for heavy metal ions were of the rectangular type so that the amounts removed from aqueous phase were constant irrespective of the concentration of solutions. The selectivity for the cations on hydroxyapatite can be explained in terms of the ionic radii and the its electronegativities. Kinetic experiments were carried out in an agitated tank adsorber. Effective diffusivities of cupric chloride, zinc chloride and cadmium chloride inside hydroxyapatite were 2.88×10^(-10)㎡/s , 2.77×10^(-10) ㎡/s 그리고 2.95×10^(-10)㎡/s, respectively. Pb^(2+) was also exchanged very quickly with Ca^(2+) and easily removed by hydoxyapatite.