Catalytic wet oxidation of trichloroethylene (TCE) in water has been conducted using TiO2-supported cobalt oxides at 36oC with a weight hourly space velocity of 7,500 h-1. 5% CoOx/TiO2, prepared by using an incipient wetness technique, might be the most promising catalyst for the wet oxidation although it exhibited a transient behavior in time on-stream activity. Not only could the bare support be inactive for the wet decomposition reaction, but no TCE removal also occurred by the process of adsorption on TiO2 surface. The catalytic activity was independent of all particle sizes used, thereby representing no mass transfer limitation in intraparticle diffusion. XPS spectra of both fresh and used Co surfaces gave different surface spectral features for each CoOx. Co 2p3/2 binding energy for Co species in the fresh catalyst appeared at 781.3 eV, which is very similar to the chemical states of CoTiOx such as Co2TiO4 and CoTiO3. The used catalyst exhibited a 780.3-eV main peak with a satellite structure at 795.8 eV. Based on XPS spectra of reference Co compound, the TCE-exposed Co surfaces could be assigned to be in the form of mainly Co3O4. XRD patterns for 5% CoOx/TiO2 catalyst indicated that the phase structure of Co species in the catalyst even before reaction is quite comparable to the diffraction lines of external Co3O4 standard. A model structure of CoOx present predominantly on titania surfaces would be Co3O4, encapsulated in thin-film CoTiOx species consisting of Co2TiO4 and CoTiO3, which may be active for the decomposition of TCE in a flow of water.

초음파 해쇄, 침강 분리 및 원심 분리 등의 물리적 처리 기술을 적용하여 감포 13호 및 35호 광구의 벤토나이트 원광석으로부터 몬모릴로나이트를 선택적으로 회수할 수 있는 습식 고순도화 공정 특성을 연구 개발하였다. 초음파를 이용한 해쇄는 슬러리의 농도가 7 wt.%인 경우 우수한 해쇄 결과를 나타냈으며 감포 13호의 경우는 30분, 감포 35호의 경우는 10분 이내에 대부분의 해쇄가 종료되었다. 30분간 침강 분리를 행한 결과 감포 13호은 원광의 약 52 wt.%, 감포 35호는 약 64wt.%를 정제된 산물로 회수하였으며, CEC는 각각 119.4, 124.5 meq/100 g이었다. 원심 분리를 이용한 입자 분리 결과, 원심 분리기의 회전수 1,000 rpm 이내에서 석영, 장석 등 대부분의 불순 광물들이 분리 제거되었다.