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TiO2/UV-A 시스템을 이용한 Cu(2)-EDTA의 광촉매 산화반응에서 TiO2 재사용 및 회수
이승목 ( Seung Mok Lee ) 한국물환경학회 2005 한국물환경학회지 Vol.21 No.1
TiO₂-catalyst suspensions work efficiently in Photocatalytic oxidation (PCO) for wastewater treatment. Nevertheless, once photocatalysis is completed, separation of the catalyst from solution becomes the main problem. The PCO of Cu(Ⅱ)-EDTA was studied to determine the reusability of the titanium dioxide catalyst. Aqueous solutions of 10^(-4)M Cu(Ⅱ)-EDTA were treated using illuminated TiO₂ particles at pH 6 in a circulating reactor. TiO₂ was reused in PCO system for treatment or Cu(Ⅱ)-EDTA comparing two procedures: reuse of water and TiO₂ and reuse of the entire suspension after PCO of Cu(Ⅱ)-EDTA. The results are as follows; (ⅰ) Photocatalytic efficiency worsens with successive runs when catalyst and water are reused without separation and filtration, whereas, when TiO₂ is separated from water, the reused TiO₂ is not deactivated. (ⅱ) The TiO₂ mean recovery (%) with reused TiO₂ was 86.4%(1.73g/L). Although the mean initial degradation rate of Cu(Ⅱ)-EDTA and Cu(Ⅱ) was lower than that using fresh TiO₂, there was no significant change in the rate during the course of the three-trial experiment. It is suggested that Cu(Ⅱ)-EDTA could be effectively treated using an recycling procedure of PCO and catalyst recovery. (ⅲ) However, without TiO₂ separation, the loss of efficiency of the PCO in the use of water and TiO₂ due to Cu(Ⅱ), DOC remained from previous degradation and Cu(Ⅱ)-EDTA added to the same suspension was observed after 2 trials, and resulted in the inhibition of the Cu(Ⅱ)-EDTA, Cu(Ⅱ) and DOC destruction.
아이돌 우상화의 요인 및 아이돌 우상화가 아이돌 광고 상품 구매의도에 미치는 매개효과 분석
이승목(Seung-Mok Lee),신재권(Jae-Gwon Shin),이상우(Sang-Woo Lee) 한국콘텐츠학회 2014 한국콘텐츠학회논문지 Vol.14 No.6
최근 들어 우리나라의 음반시장과 광고시장에서 아이돌이 차지하는 비중은 지속적으로 증가하고 있다. 본 연구에서는 아이돌 팬들이 아이돌을 우상화하는 요인들을 살펴보았고, 이러한 요인들이 10대 팬과 20대 팬 간 차이가 있는지를 분석하였다. 그리고 아이돌 우상화의 요인들이 아이돌 우상화를 매개로 하여 아이돌이 광고하는 상품의 구매의도에 영향을 미치는지를 분석하였다. 연구결과, 아이돌 팬들은 아이돌 가수들의 목소리가 좋고 공연무대에 매력을 느낄수록 아이돌을 우상화하는 경향이 있었고, 아이돌에 대한 주위의 평가와 아이돌의 노래, 춤, 화술 등 아이돌의 표현방법이 좋을수록 우상화하는 경향이 높았다. 한편 20대 팬들은 10대 팬들에 비해 아이돌의 표현방법이 좋을수록 아이돌을 우상화하는 경향이 더욱 높았다. 또한 팬들은 아이돌을 허구의 연애상대로 상상할 수 있을 때 더 우상화 하는 것으로 나타났고, 아이돌 우상화의 요인들은 아이돌 광고상품 구매의도에 직, 간접적으로 영향을 미치는 것으로 밝혀졌다. Nowadays idol pop singers are popular with teenagers and adult. Accordingly idol pop singers take a picture of advertisement. because idol pop singers have a lot of fans who are willing to use advertising products. The purpose of the present study examined causes of idol worship and differences of causes of idol worship between in idol fans 10s and 20s. And this article investigated idol fans intention to purchase the merchandises advertised by idol. The result showed that idols features, idols evaluation, idols ways of expression, romanticization of the idol had significant effect on idol worship. And there were no significant differences of idol worship between in idol fans 10s and 20s. Also these causes of idol worship affected on Idol fans intention to purchase the merchandises advertised by idol. In other words, idol worship was partially mediated the positive relation between by causes of idol worship and intention to purchase the merchandises.
점감형 흡착탑과 실린더형 흡착탑의 파과특성 비교에 관한 연구
이승목(Seung Mok Lee),김원기(Won Gee Kim) 한국수처리학회 1997 한국수처리학회지 Vol.5 No.4
Adsorption on activated carbon is a very effective treatment method for removal of a broad spectrum of organic chemicals from water supplies and wastewater. Although GAC(granular activated carbon) treatment has been designated as BAT(best available technology) for the removal of several compounds. there are major technical and economic concerns that are forcing utilities to look at other alternatives including with the new regulations. Adsorption is typically carried out in fixed or pulsed beds in columns of constant cross section or in slurry reactors. Recent studies by the principal investigator has shown that adsorption efficiency can be increased substantially by a judicious selection of adsorbent size distribution and a variable cross section for the column. Under identical operating conditions, a reverse stratified tapered bed was shown to increase breakthrough time by 30% to 200% over the conventional cylindrical fixed bed for the solute-adsorbent system studied. Moreover, column pressure drops are lower for the RSTA than the conventional system. Water and wastewater plants processing large volumes of water can realize significant savings in capital and operating costs by utilizing this type of operation. This has wide ranging implications for adsorption technology and its applications in the processing of water and wastewater, hazardous waste and solid waste leachate treatment, and groundwater remediation.
이승목(Seung Mok Lee),최봉종(Bong Jong Choi),김근한(Keun Han Kim) 한국수처리학회 1998 한국수처리학회지 Vol.6 No.2
The removal of phosphate from wastewaters prior to discharge into natural water is an essential measure to prevent eutrophication in receiving waters. Phosphate removal through adsorbents, such as activated alumina, powdered aluminum oxide, activate red mud, flyash, blast furnace slag and other materials, is commonly and successfully practiced. The wasted sludge from seafood processing factory prepared on a laboratory scale has been used to evaluate its performance for phosphate removal. The material has been shown to be a good alternative adsorbent. As much as 90% phosphate removal by the prepared sludge is possible in about 20hrs under the test conditions. Phosphate removal is seen to increase with decreasing adsorbent particle size, increasing relative concentration of phosphate to sludge and increasing adsorbent dose. The removal efficiency is not precipitation dependent in these experimental circumstances.