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석탄광산배수슬러지를 이용한 액상상태의 비소제거 흡착특성 및 반응속도에 관한 연구
이세반 ( Se Ban Lee ),최명찬 ( Ming Can Cui ),장민 ( Min Jang ),문덕현 ( Deok Hyun Moon ),조윤철 ( Yun Chul Cho ),김지형 ( Jee Hyeong Khim ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.2
In this research, equilibrium of adsorption and kinetics of As(V) removal were investigated. The coal mine drainage sludge(CMDS) was used as adsorbent. To find out the physical and chemical properties of CMDS, XRD (X-ray diffraction), XRF (X-ray fluorescence spectrometer) analysis were carried out. The CMDS was consist of 70% of goethite and 30% of calcite. From the results, an adsorption mechanism of As(V) with CMDS was dominated by iron oxides. Langmuir adsorption isotherm model was fitted well more than Freundlich isotherm adsorption model. Adsorption capacities of CMDS 1 was not different with CMDS 2 on aspect of amounts of arsenic adsorbed. The maximum adsorption amount of two CMDS were respectively 40.816, 39.682 mg/g. However, the kinetic of two CMDS was different. The kinetic was followed pseudo second order model than pseudo first order model. Concentrations of arsenic in all segments of the polymer in CMDS 2 does not have a constant value, but the rate was greater than the value of CMDS 1. Therefore, CMDS 2, which is containing polymer, is more effective for adsorbent to remove As(V).
초음파 촉매 공정에서 주파수와 고정된 고체 촉매가 라디칼 생성에 미치는 영향
조은주 ( Eun Ju Cho ),나승민 ( Seung Min Na ),이세반 ( Se Ban Lee ),김지형 ( Jee Hyeong Khim ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.2
The fixed solid catalysts such as glass bead, steel mesh, and TiO2 coated ceramic bead were used to investigate effect of radical production at different frequencies. The radical production rate at 300 kHz was faster than that at 35 kHz without solid, but the tendency was changed with the presence of glass bead. The presence of glass beads create non-continuous points between the solid and liquid phases leading to increased formation of cavitation bubbles. However, the radical production decreased when steel mesh was used at 35 kHz although the surface area of contact with liquid was same when glass bead was used. Hence the solid catalyst did not always enhance the radical production. The radical production using TiO2 coated ceramic bead was dramatically increased at 35 kHz due to the breakage of TiO2 coated ceramic bead. Therefore the radical productions at 300 kHz using fixed solid catalysts generally increased while at 35 kHz the results fluctuated according to the experimental conditions.
채금화 ( Jin Hua Cai ),나승민 ( Seung Min Na ),안윤경 ( Yun Gyong Ahn ),이세반 ( Se Ban Lee ),김지형 ( Jee Hyeong Khim ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.4
In this study, Ibuprofen (IBP) degradation by the photo catalytic process was investigated under various parameters, such as UV intensity, optimum dosage of TiO2, alkalinity, temperature and pH of bulk solution. The pseudo-first order degradation rate constants were in the order of 10-1 to 10-4 min-1 depending on each condition. The Photocatalytic IBP degradation rate increased with an increase in the applied UV power. At high UV intensity a high rate of tri-iodide (I3 -) ion formation was also observed. Moreover, in order to avoid the use of an excess catalyst, the optimum dosage of catalyst under the various UV intensities (30 and 40 W/L) was examined and ranged from approximately 0.1 gL-1. The photo catalytic IBP degradation rate was changed depending on the alkalinity and temperature and pH in the aqueous solution. This study demonstrated the potential of photo catalytic IBP degradation under different conditions.