유기토양을 이용한 Trichloroethane과 m-Xylene의 기상흡착 = Vapor Adsorption of Trichloroethane and m-Xylene Using Organocally Modified Clay

다국어 초록 (Multilingual Abstract)

Trichloroethane and m-xylene vapor was adsorbed to organically modified montmorillonite (organoclay). HDTMA (Hexadecyltrimethylammonium) was used to modify the surface of clay, which have different HDTMA loadings (organoclay CEC 50, CEC 100, CEC 200). The non-modified clay and organoclay were characterized by BET surface area, SEM (Scanning Electron Microscope) and XRD (X-ray diffraction).
In adsorption experiment, organoclay along with the non-modified (washed) clay were used. Trichloroethane and m-xylene was adsorbed gaseous phase (nitrogen) using a fixed adsorption bed, and the adsorption breakthrough curve and the adsorption isotherms were determined at three different temperatures (24℃, 34℃ and 44℃). The adsorption data were modeled with the Langmuir, Freundlich and BET (Brunauer, Emmett, Teller) isotherms equations. It was found that the adsorption isotherm type for trichloroethane exhibited of non-modified clay BET Type Ⅰ, organoclay CEC 50 favorable, CEC 100 liner, CEC 200 unfavorable (BET Type Ⅲ) also adsorption isotherm type for m-xylene exhibited of non-modified clay BET Type Ⅰ, organoclay CEC 100 BET Type Ⅱ. Desorption of trichloroethane and m-xylene was conducted using pure nitrogen, and the desorption profiles were fitted with Brady and Tan & Liou theoretical models. The adsorption capacity of non-modified clay and organoclay obviously decreased with increasing temperature. The heat of adsorption was determined for both organoclay and non-modified clay, and the temperature dependency of the two types of clay (non-modified clay, organoclay) showed the opposite trends.

목차 (Table of Contents)

• 1. 서론 1
• 2. 연구 배경 5
• 2.1 점토의 구조 5
• 2.2 유기토양을 이용한 유기물의 흡착 7
• 2.3 흡착 파과곡선 11
• 2.4 흡착 등온선 13
• 2.5 고정층 추출조에 대한 이론적 해석 16
• 3. 실험 18
• 3.1 실험재료 18
• 3.2 몬모릴로나이트의 정제 20
• 3.3 유기토양의 제조 21
• 3.4 휘발성 유기화합물의 흡착실험 23
• 3.5 휘발성 유기화합물의 탈착실험 24
• 4. 실험결과 및 고찰 26
• 4.1 유기토양의 특성 26
• 4.2 BET & XRD 측정 27
• 4.3 휘발성 유기화합물의 흡착 32
• 5. 결론 87
• 6 참고문헌 90
• 영문 초록 94