활성탄 흡착에 의한 Amaranth의 제거

이종집,윤성욱 한국안전학회 2009 한국안전학회지 Vol.24 No.4

The adsorption characteristics of amatanth by granular activated carbon were experimently investigated in the batch adsorber and the packed column. The adsorptivity of activated carbon for amaranth were largely improved by pH control, and 94 percent of initial concentration(100mg/L) could be removed at pH 9. It was estabilished that the adsorption equilibrium of amaranth on granular activated carbon was sucessfully fitted by Freundlich isotherm equation in the concentration range from 1mg/L to 100mg/L. The characteristics of breakthrough curve of activated carbon packed column, which depend on the design variables such as initial concentration, bed height, and flow rate, were studied.

활성탄 흡착에 의한 Ethyl Violet의 공정 파라미터 연구

이종집 한국수처리학회 2018 한국수처리학회지 Vol.26 No.6

The process parameters of ethyl violet from aqueous solution by activated carbon adsorption were carried out as a function of pH, temperature, contact time, initial concentration and temperature. The adsorption equilibrium data can be described well by the Langmuir and Freundlich isotherm models. Base on Langmuir constant (RL=0.0343~0.0523) and Freundlich constant (1/n=0.1633~0.1974), This process could be employed as effective treatment for adsorption of ethyl violet. The kinetic experimental results showed that the adsorption process can be well described with the pseudo second order model. Based on the positive enthalpy (6.505 kJ/mol), the adsorption of ethyl violet onto granular activated carbon is endothermic. The negative Gibbs free energy (-1.169~-1.681 kJ/mol) obtained indicates that the adsorption process is spontaneous and physisorption.

셀룰로오스의 분해특성 및 연료물질 생성(II)-용매분해반응-

이종집,이병학 한국수소및신에너지학회 2005 한국수소 및 신에너지학회논문집 Vol.16 No.2

Cellulose, consisted of 45 wt% in wood, is usable as fuels and heavy oil additives if depolymerized to monomer unit, because the chemical structures are similar to high octane materials found in gasoline. In this study, thermochemical degradation by solvolysis reaction of cellulose such as the effect of reaction temperature, reaction time and type of solvent on conversion yield and degradation products were investigated. It was found that the effectiveness of the solvent on the sovolysis reaction was as follows; acetone>n-butanol>tetralin. When acetone was used as a solvent, the highest cellulose conversion was observed to be 91.8% at 500 , 40min. Combustion heating value of liquid products from thermochemical conversion processes was in the range of 7,330∼7,410cal/g. The energy yield and mass yield in acetone-solvolysis of cellulose was as high as 66.8% and 37.0 g oil/100g raw material after 40min of reaction at 400 . Various aliphatic and aromatic compounds were detected in the cellulose solvolysis products. The major components of the solvolysis products, that could be used as fuel, were mesityl oxide, mesitylene, isophorone.

야자계 입상 활성탄에 의한 brilliant green의 흡착 특성: 평형, 동력학 및 열역학 파라미터에 관한 연구

이종집 한국청정기술학회 2019 청정기술 Vol.25 No.3

야자계 입상활성탄에 대한 Brilliant Green의 흡착 평형과 동역학 및 열역학 파라미터들을 다양한 초기농도(300 ~ 500 mgL-1), 접촉시간(1 ~ 12 h) 및 흡착온도(303 ~ 323 K)를 변수로 하여 회분식 실험을 통하여 연구하였다. 흡착평형 값들은Langmuir, Freundlich, Temkin, Harkins-Jura 및 Elovich 식으로 해석하였다. 그 결과는 Langmuir 식에 가장 잘 맞았으며, 평가된 Langmuir 무차원 분리계수 값(RL = 0.018 ~ 0.040)과 Freundlich 상수값(1/n = 0.176 ~ 0.206)은 활성탄에 의한 BrilliantGreen의 흡착이 효과적인 공정임을 보여주었다. Temkin 식에 의해 평가된 흡착열 관련상수(B = 12.43 ~ 17.15 J mol-1)는 물리흡착에 해당하였다. Harkins-Jura 식에 의한 등온선 매개변수(AHJ)는 온도가 증가할수록 이종 기공 분포도 증가함을 나타내었고, Elovich 식에 의한 최대흡착용량은 실험값보다 매우 적은 것으로 나타났다. 흡착공정은 유사이차반응속도식에 더잘 맞았으며, 흡착과정은 입자내 확산이 율속단계였다. 입자내 확산속도 상수는 초기 농도가 커질수록 염료의 운동이 활발해졌기 때문에 증가하였다. 그리고 초기농도가 커질수록 경계층의 영향이 커졌다. Gibbs 자유에너지(-3.46 ~ -11.35 kJmol-1), 엔탈피(18.63 kJ mol-1) 및 활성화에너지(26.28 kJ mol-1)는 흡착공정이 자발적이고, 흡열 및 물리흡착임을 나타냈다. The adsorption equilibrium, kinetic, and thermodynamic parameters of brilliant green adsorbed by coconut basedgranular activated carbon were determined from various initial concentrations (300 ~ 500 mg L-1), contact time (1 ~ 12 h), andadsorption temperature (303 ~ 323 K) through batch experiments. The equilibrium adsorption data were analyzed by Langmuir,Freundlich, Temkin, Harkins-Jura, and Elovich isotherm models. The estimated Langmuir dimensionless separation factor (RL= 0.018 ~ 0.040) and Freundlich constant (n-1 = 0.176 ~ 0.206) show that adsorption of brilliant green by activated carbon is aneffective treatment process. Adsorption heat constants (B = 12.43 ~ 17.15 J mol-1) estimated by the Temkin equationcorresponded to physical adsorption. The isothermal parameter (AHJ) by the Harkins-Jura equation showed that theheterogeneous pore distribution increased with increasing temperature. The maximum adsorption capacity by the Elovichequation was found to be much smaller than the experimental value. The adsorption process was best described by the pseudosecond order model, and intraparticle diffusion was a rate limiting step in the adsorption process. The intraparticle diffusion rateconstant increased because the dye activity increased with increases in the initial concentration. Also, as the initial concentrationincreased, the influence of the boundary layer also increased. Negative Gibbs free energy (-10.3 ~ -11.4 kJ mol-1), positiveenthalpy change (18.63 kJ mol-1), and activation energy (26.28 kJ mol-1) indicate respectively that the adsorption process is spontaneous, endothermic, and physical adsorption.

농부산물 바이오매스를 이용한 연료물질의 생성

이종집 한국수소및신에너지학회 2007 한국수소 및 신에너지학회논문집 Vol.18 No.1

Rice straw, produced as an agricultural by-product, is usable biomass as fuels if depolymerized to monomer unit, because the chemical structure are similar to high octane materials found in gasoline. In this study, parameters of thermochemical degradation by solvolysis reaction of rice straw such as the effect of reaction temperature, reaction time and type of solvent on conversion yield and degradation products were investigated. It was found that the effectiveness of the solvent on the solvolysis reaction was as follows; acetone>cresol>butanol. When acetone was used as a solvent, the highest rice straw conversion was observed to be 91.5% at 500℃, 40 min. Combustion heating value of liquid products from thermochemical conversion processes was in the range of 7,380 cal/g. The energy yield and mass yield in acetone-solvolysis of rice straw was as high as 69.0% and 38.2 g-oil/100g-raw material after 40 min of reaction at 350℃. Various aliphatic and aromatic compounds were detected in the rice straw solvolysis products. The major components of the solvolysis products, that could be used as fuel, were 4-methyl -2-pentanone, 3,5,5-trimethyl-2-cyclopentan-1-one as ketones.

입상 활성탄에 대한 비스마르크 브라운 R 염료의 흡착평형, 동력학 및 열역학 파라미터에 관한 연구

이종집 한국공업화학회 2013 공업화학 Vol.24 No.3

입상 활성탄에 대한 bismarck brown R의 흡착평형, 동력학 및 열역학 파라미터들을 회분식 실험을 통해 살펴보았다. 조작변수로서 초기농도, 접촉시간과 흡착온도의 영향을 조사하였다. 흡착평형자료는 선형회귀법을 사용하여 Langmuir 와 Freundlich 흡착등온식에 대한 적합성을 평가하였다. 흡착평형은 Freundlich 흡착등온식이 더 잘 맞았으며, 계산된분리계수(1/n) 값으로부터 입상 활성탄이 bismarck brown R을 효과적으로 처리할 수 있다는 것을 알 수 있었다. 동력학적 실험으로부터, 흡착공정은 유사이차반응속도식에 잘 맞으며, 속도상수(k2) 값은 온도가 증가할수록 증가하였다. 활성화에너지, 엔탈피, 엔트로피 및 Gibbs 자유에너지변화와 같은 열역학 파라미터들은 흡착공정의 특성을 평가하기 위하여 298∼318 K의 온도 범위에서 조사하였다. 활성화 에너지의 계산값은 100 mg/L에서 8.73 kJ/mol로 입상 활성탄에대한 bismarck brown R의 흡착이 물리적 공정임을 나타냈다. Gibbs 자유에너지변화의 음수값(ΔG = -2.59∼-4.92 kJ/mol)과 엔탈피변화의 양수값(ΔH = +26.34 kJ/mol)은 흡착공정이 자발적이며 흡열과정으로 일어난다는 것을 나타냈다.

활성탄에 의한 Reactive Orange 16 염료 흡착에 대한 공정 파라미터 연구

이종집 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.7

활성탄에 의한 reactive orange 16 (RO 16) 염료의 흡착은 흡착제의 양, pH, 초기 농도, 접촉시간과 온도를 흡착변수로 사용하여 실험하였으며, 분리계수, 속도상수, 율속단계, 활성화 에너지, 엔탈피, 엔트로피, 자유에너지와 같은 공정 파라미터에 대해 조사하였다. RO 16의 흡착은 활성탄 표면의 양이온 (H+)과 RO 16이 가지고 있는 설포네이트 이온 및 수산 이온사이의 정전기적 인력으로 인해 pH 3에서 흡착율이 가장 높았다. 등온자료는 Langmuir, Freundlich 및 Temkin 등온식을 적용하였다. Freundlich 상수(1/n=0.398〜0.441)와 Langmuir 분리계수(RL=0.459〜0.491)에 의해 활성탄에 의한 RO 16의 흡착조작은 적절한 제거방법임을 확인하였다. Temkin 식의 흡착에너지 (BT=0.293~0.576 kJ/mol) 값으로부터 이 흡착공정이 물리흡착공정이라는 것을 알았다. 흡착 동력학 실험은 RO 16의 흡착이 유사이차반응속도식에 잘 맞는 것으로 나타났다. 흡착공정의 율속단계는 입자 내 확산 단계인 것이 확인되었다. 양수값의 엔탈피 변화는 물리흡착임을 나타냈다. 음수값의 깁스 자유에너지 변화는 온도가 올라갈수록 –3.16<-11.60<-14.01 kJ/mol 순으로 작아졌다. 따라서 RO 16의 흡착공정의 자발성이 온도가 증가할수록 높아진다는 것을 보여주었다. The adsorption of reactive orange 16 (RO 16) dye by activated carbon was investigated using the amount of adsorbent, pH, initial concentration, contact time and temperature as adsorption variables. The investigated process parameters were separation coefficient, rate constant, rate controlling step, activation energy, enthalpy, entropy, and free energy. The adsorption of RO 16 was the highest at pH 3 due to the electrostatic attraction between the cations (H+) on the surface of the activated carbon and the sulfonate ions and hydroxy ions possessed by RO 16. Isotherm data were fitted into Langmuir, Freundlich and Temkin isotherm models by applying the evaluated separation factor of Langmuir (RL=0.459~0.491) and Freundlich (1/n=0.398~0.441). Therefore, the adsorption operation of RO 16 by activated carbon was confirmed as an appropriate removal method. Temkin's adsorption energy indicated that this adsorption process was physical adsorption. The adsorption kinetics studies showed that the adsorption of RO 16 follows the pseudo-second-order kinetic model and that the rate controlling step in the adsorption process was the intraparticle diffusion step. The positive enthalpy change indicated an endothermic process. The negative Gibbs free energy change decreased in the order of -3.16 <-11.60 <-14.01 kJ/mol as the temperature increased. Therefore, it was shown that the spontaneity of the adsorption process of RO 16 increases with increasing temperature.

[품목동향] 전략물자 품목소개 및 통제동향 : 탄소섬유(Carbon Fiber)

이종집 전략물자관리원 2013 전략물자 focus Vol.- No.7

활성탄 고정층에 대한 Tharonil의 흡착특성에 관한 연구

이종집,유용호 한국산업안전학회 2002 한국안전학회지 Vol.17 No.1

To obtain the breakthrough characteristics for the design of fixed bed adsorption plant, adsorption experiment on granular activated carbon was performed with tharonil in the fixed bed. The pore diffusivity and surface diffusivity of tharonil estimated by the concentration-time curve and adsorption isotherm were D_s=2.825×10 exp (-9) ㎠/s, D_P=1.26×10 exp (-5) ㎠/s, respectively. From comparison of the pore diffusivity and surface diffusivity, it was found that surface diffusion was controlling step for intrapaticle diffusion. The breakthrough curve predicted by constant pattern-linear driving force model were shown to agree with the experimental results. The surface diffusivity and film mass transfer coefficient had no effect on the theoretical breakthrough curve but the adsorption isotherm had fairly influence on it. Appearance time of breakthrough curve is faster with the increase flow rate and inflow concentration of liquid. The utility of granular activated carbon is enhanced with the increase of bed height and with the decrease of inflow rate.

활성탄을 이용한 아닐린 블루의 흡착평형, 동역학 및 열역학 파라미터에 대한 해석

이종집 한국화학공학회 2019 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.57 No.5

수용액으로부터 활성탄에 대한 아닐린 블루의 흡착 평형, 동역학 및 열역학적 특성을 초기농도, 접촉시간과 온도를흡착변수로 하여 조사하였다. 아닐린 블루의 등온흡착은 Langmuir, Freundlich, Redlich-Peterson, Temkin 및Dubinin-Radushkevich 모델을 통해 해석하였다. Langmuir 모델이 다른 모델들 보다 등온 데이터에 더 잘 맞았다. 평가된 Langmuir 분리계수(RL=0.036~0.068)는 활성탄에 의한 아닐린 블루의 흡착 공정이 효과적인 처리방법이 될수 있음을 나타냈다. 흡착속도상수는 유사일차속도 모델, 유사이차속도 모델 및 입자내 확산 모델에 적용하여 구하였다. 활성탄에 대한 아닐린 블루의 흡착속도실험 결과는 유사이차 반응속도식에 잘 따랐다. 흡착 메카니즘은 입자내 확산 모델에 의해 경막 확산과 입자내 확산의 두 단계로 평가되었다. 흡착공정에 대한 깁스 자유에너지, 엔탈피및 엔트로피 변화와 같은 열역학 파라미터들이 평가되었다. 엔탈피 변화(48.49 kJ/mol)은 흡착공정이 물리흡착이고흡열반응임을 알려주었다. 깁스 자유 에너지는 온도가 올라갈수록 감소하였기 때문에 흡착반응은 온도가 올라갈수록 자발성이 더 높아졌다. 등량흡착열은 흡착제 표면의 에너지 불균일성 때문에 흡착제와 흡착질 사이에 상호작용이 있음을 나타내었다. Characteristics of adsorption equilibrium, kinetic and thermodynamic of aniline blue onto activated carbon from aqueous solution were investigated as function of initial concentration, contact time and temperature. Adsorption isotherm of aniline blue was analyzed by Langmuir, Freundlich, Redlich-Peterson, Temkin and Dubinin-Radushkevich models. Langmuir isotherm model fit better with isothermal data than other isotherm models. Estmated Langmuir separation factors (RL=0.036~0.068) indicated that adsorption process of aniline blue by activated carbon could be an effective treatment method. Adsorption kinetic data were fitted to pseudo first order model, pseudo second order model and intraparticle diffusion models. The kinetic results showed that the adsorption of aniline blue onto activated carbon well followed pseudo second-order model. Adsorption mechanism was evaluated in two steps, film diffusion and intraparticle diffusion, by intraparticle diffusion model. Thermodynamic parameters such as Gibbs free energy, enthalpy and entropy for adsorption process were estimated. Enthalpy change (48.49 kJ/mol) indicated that this adsorption process was physical adsorption and endothermic. Since Gibbs free energy decreased with increasing temperature, the adsorption reaction became more spontaneously with increasing temperature. The isosteric heat of adsorption indicated that there is interaction between the adsorbent and the adsorbate because the energy heterogeneity of the adsorbent surface.