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양이온성 계면활성제가 코팅된 점토에 의한 난용성유기물의 제거 - 양이온성 계면활성제가 코팅된 벤토나이트에 의한 난용성유기물의 흡착 -
김학성,정영도,주득종 ( Hag Seong Kim,Young Do Jeong,Duk Jong Joo ) 한국공업화학회 1995 공업화학 Vol.6 No.3
콜로이드상의 bentonite입자에 양이온성 계면활성제인 cetyltrimetylammonium bromide(CTAB)를 흡착시켜 소수성 핵심을 형성시킨 후 난용성유기물질들(HOCs)의 수용액에서의 물과 소수성 핵심 사이의 분배 현상을 연구하였다. 첫째, 물속에 녹아 있는 CTAB의 농도의 분석은 간접적인 방법으로 K₂Cr₂O_7의 산화력을 이용한 COD측정법을 이용할 수 있다. 둘째, CTAB가 벤토나이트 입자표면과 용액 내에 분배되는 현상은 용액의 이온세기(I)에 의해 영향을 받으며 CTAB의 평형농도가 cmc 부근에서 K_d값은 I=0.0일 때 11.5, I=0.1일 때 22∼24 범위내에 들고, CTAB의 평형농도가 cmc보다 커짐에 따라 서서히 감소하여 Kd 3에 접근한다. 셋째, HOC가 흡착된 CTAB에 의해 형성된 소수성 핵심과 용액에 분배되어 평형을 이룰 때 분배계수(Kd)를 계산함에 있어서 벤토나이트 단위질량당 HOC의 흡착량 즉 mole HOC/g solid를 이용하는 것보다는 흡착된 CTAB의 단위질량당 HOC의 흡착량 즉 mole HOC/g CTAB_(adsorbed)를 이용하는 것이 더욱 합리적이다. K_d값은 toluene의 경우 I=0.0일 때 230∼250으로부터 I=0.1일 때 110∼130으로 감소하는 반면에 trichloroe-thylene의 경우는 I=0.0일 때와 I=0.1일 때 모두 120∼160으로서 거의 같게 나타났다. The distribution phenomena of sparingly soluble hydrophobic organic compounds(HOCs) between bulk water and hydrophobic cores formed on the surface of colloidal bentonite particles by adsorption of cetyltrimetylammonium bromide(CTAB) were studied. First, the concentration of CTAB could be determined indirectly from COD measurement with K₂Cr₂O_7. Second, the distribution ratios(K_d) of CTAB were found to be affected by the ionic strength(I) of the medium and the total concentration of CTAB; i.e., as I varies from 0.0 to 0.1 K_d has a value of 11.5 and within a range of 22∼24, respectively, at around the cmc of CTAB. As the concentration of CTAB increased, K_d values approached to 3. Third, the determination of K_d based on the mass of adsorbed CTAB appeared to be more reasonable than that based on the mass of solid on which surface adsorption occurred. For toluene K_d values decreased from 230∼250 to 110∼130 as I varies from 0.0 to 0.1, but for trichloroethylene they appeared to be nearly same, 120∼160, regardless of the difference in ionic strength.
김학성(Hag Seong Kim),이진필(Jin Phil Lee),한훈석(Hoon Suk Han) 한국유화학회 1999 한국응용과학기술학회지 Vol.16 No.1
N/A For a cosmetic plant wastewater containing surfactants of high concentration, adsorption treatment by granular activated carbon(GAC) having different pore size distribution was studied. Three sorts GACs were used and regenerated afterwards with methanol. Experiments were composed of batch process and column test for both virgin and regenerated GACs. Following conclusions were drawn from the study : Methylene blue activating substance(MBAS) adsorption data from the batch tests for three GACs are described well by BET isotherm and Freundich isotherm. Simulation with the BET isotherm shows that maximum adsorption appears to be affected not only by specific surface area but also by pore size distribution. Maximum adsorption from the BET isotherm for MBAS appears to diminish as the number of reactivation increases. The diminshing ratio of maximum adsorption appears to decrease as the pore size methanol ranges from 95% to 97%.