• Title, Summary, Keyword: liquid adsorption isotherm

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Adsorption of ibuprofen sodium salt onto Amberlite resin IRN-78: Kinetics, isotherm and thermodynamic investigations

  • Taleb, Fayrouz;Mosbah, Mongi ben;Elaloui, Elimame;Moussaoui, Younes
    • Korean Journal of Chemical Engineering
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    • v.34 no.4
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    • pp.1141-1148
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    • 2017
  • Amberlite resin IRN-78 was used for the adsorption of Ibuprofen sodium salt (IBP) from liquid phase. The effects of solvent, initial concentration, solution pH, temperature and contact time were investigated. Adsorption studies were carried out in water and in ethanol. It was found that the adsorption capacity was dependent on pH. The optimum pH range was between 6 and 10. The maximum adsorption capacities on the IRN-78 were 1.266 and 0.611 mmol/g for IBP in water and in ethanol, respectively. The equilibrium data of the adsorption of IBP onto IRN-78 fit well to the Langmuir model. The separation factor ($R_L$) values were in the range of 0-1, indicating that the adsorption was favorable. The values of thermodynamic parameters including ${\Delta}G^0$, ${\Delta}H^0$ and ${\Delta}S^0$ demonstrated that the adsorption of IBP onto IRN-78 was spontaneous and endothermic within the temperature range of 288-308 K. The adsorption process was controlled by physical mechanism rather than chemical mechanism.

Liquid Phase Adsorption Equilibria of Amines onto High Silica Zeolite, Macroreticular Resin and Granular Activated Carbon (고시리카제올라이트, 거대망상수지 및 입상활성탄에 의한 아민류의 액상흡착평형)

  • Lee, Sung-Sik;Kim, Hyung-Jun;Yu, Myung-Ho
    • Applied Chemistry for Engineering
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    • v.9 no.5
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    • pp.661-666
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    • 1998
  • Liquid phase adsorption equilibria of amines in an aqueous solution onto high silica zeolite pellets (HSZ), macroreticular resin particles (MR) and granular activated carbon (GAC) were determined using a batch bottle technique at 298K. The isotherm curves of HSZ-amines and GAC-amines indicate the nonlinear relationship of unfavorable adsorption type of HSZ-amines and favourable one of GAC-amines. However the curves of MR-amines represent the linear pattern of an adsorption isotherm. Among various equilibrium isotherms, the three parameters of the Redlich-Peterson equation and the two parameters of the Freundlich equation are found to be the most satisfactory within the range of this study. The two parameters of the Langmuir isotherm were not applicable to the present adsorption systems. The amines were adsorbed on the HSZ, MR and GAC in the following sequence of adsorptivity; aromatic amines > primary amines > secondary amines. The product of the Freundlich constants, k and n, proportionally increased with the boiling point, molar volume and dissociation constants of amines adsorbed on HSZ, MR and GAC.

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Equilibrium and kinetic studies on the adsorption of copper onto carica papaya leaf powder

  • Varma V., Geetha;Misra, Anil Kumar
    • Membrane Water Treatment
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    • v.7 no.5
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    • pp.403-416
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    • 2016
  • The possibility of using carica papaya leaf powder for removal of copper from wastewater as a low cost adsorbent was explored. Different parameters that affect the adsorption process like initial concentration of metal ion, time of contact, adsorbent quantity and pH were evaluated and the outcome of the study was tested using adsorption isotherm models. A maximum of 90%-94.1% copper removal was possible from wastewater having low concentration of the metal using papaya leaf powder under optimum conditions by conducting experimental studies. The biosorption of copper ion was influenced by pH and outcome of experimental results indicate the optimum pH as 7.0 for maximum copper removal. Copper distribution between the solid and liquid phases in batch studies was described by isotherms like Langmuir adsorption and Freundlich models. The adsorption process was better represented by the Freundlich isotherm model. The maximum adsorption capacity of copper was measured to be 24.51 mg/g through the Langmuir model. Pseudo-second order rate equation was better suited for the adsorption process. A dynamic mode study was also conducted to analyse the ability of papaya leaf powder to remove copper (II) ions from aqueous solution and the breakthrough curve was described by an S profile. Present study revealed that papaya leaf powder can be used for the removal of copper from the wastewater and low cost water treatment techniques can be developed using this adsorbent.

Automated Cold Volume Calibration of Temperature Variation in Cryogenic Hydrogen Isotope Sorption Isotherm (극저온(20K) 수소동위원소 흡착 등온선의 온도 변화에 대한 자동 저온 부피 교정)

  • Park, Jawoo;Oh, Hyunchul
    • Korean Journal of Materials Research
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    • v.29 no.5
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    • pp.336-341
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    • 2019
  • The gas adsorption isotherm requires accurate measurement for the analysis of porous materials and is used as an index of surface area, pore distribution, and adsorption amount of gas. Basically, adsorption isotherms of porous materials are measured conventionally at 77K and 87K using liquid nitrogen and liquid argon. The cold volume calibration in this conventional method is done simply by splitting a sample cell into two zones (cold and warm volumes) by controlling the level sensor in a Dewar filled with liquid nitrogen or argon. As a result, BET measurement for textural properties is mainly limited to liquefied gases (i.e. $N_2$ or Ar) at atmospheric pressure. In order to independently investigate other gases (e.g. hydrogen isotopes) at cryogenic temperature, a novel temperature control system in the sample cell is required, and consequently cold volume calibration at various temperatures becomes more important. In this study, a cryocooler system is installed in a commercially available BET device to control the sample cell temperature, and the automated cold volume calibration method of temperature variation is introduced. This developed calibration method presents a reliable and reproducible method of cryogenic measurement for hydrogen isotope separation in porous materials, and also provides large flexibility for evaluating various other gases at various temperature.

Adsorption on Solid Surface from Binary Liquid Solution (이성분 용액에서의 고체 표면에 대한 흡착)

  • Seihun Chang;Hyungsuk Pak;Sangyoun Park
    • Journal of the Korean Chemical Society
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    • v.17 no.2
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    • pp.80-84
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    • 1973
  • In treating solid-liquid interfaces, it is assumed that the adsorbed layer consists of monolayer and the molecules of the adsorbed layer behave as two dimensional liquid and oscillate harmonically in the vertical direction to the adsorbent. Applying the transition state theory of significant liquid structure to the adsorbed molecules, the adsorption isotherm, entropy and heat of adsorption for cyclohexane-benzene solutions adsorbed on silica-gel G are calculated. The calculated values are in good agreements with those of the observed ones.

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Adsorption of $N_2$ and Ar Gases on the Non-porous Perovskite Surfaces (무공성 Perovskite 표면에서의 $N_2$와 Ar 기체의 흡착)

  • Hyun-Woo Cho;Jung-Soo Kim;Kwang-Soon Lee;Woon-Sun Ahn
    • Journal of the Korean Chemical Society
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    • v.35 no.3
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    • pp.204-210
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    • 1991
  • Multilayer adsorption isotherms of nitrogen and argon on the perovskite-type mixed oxides, synthesized by a citrate coprecipitation method, are determined at the liquid nitrogen temperature using a gravimetric adsorption apparatus. The volume of the adsorbed gas are plotted against the statistical thickness of the adsorbed layer, calculated from several universal adsorption isotherms one after another. The t-method area obtained from this plot is compared with the BET area and finally the appropriateness of universal adsorption isotherms is then discussed on the basis of the plot.

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Liquid Phase Adsorption of Activated Carbon Fibers (활성탄소섬유의 액상흡착)

  • Moon, Dong Cheul;Kim, Chang Soo;Park, Il Yeong;Kim, Mi Ran;Hong, Seung Soo;Lee, Kwang Ho;Lee, Chang Gi
    • Analytical Science and Technology
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    • v.13 no.5
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    • pp.573-583
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    • 2000
  • Activated carbon fibers (ACFs) were prepared from various precursors of plantic, synthetic, and mixed fabrics of viscous rayon and cotton. Their adsorption performances of phenol and methylene blue in aqueous phase were evaluated through their adsorption isotherms, adsorption rates and breakthrough curves. The two adsorbates showed type I adsorption isotherm on ACFs. Adsorption rates to ACFs were 100 fold faster than to GAC. The effective diffusion coefficients of the adsorbates in ACFs were twenty fold greater than in GAC. The ACFs removed completely ten organic pollutants from a prepared water specimens through the 2nd column of a natural filtration method where 50 L of the water samples were treated.

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Nonlinear Adsorption Isotherm of Single and Multi-Components of 2'-Deoxyribonucleosides (2'-deoxyribonucleosides의 단일 및 다성분계의 비선형 흡착평형식)

  • Jin, Long Mei;Han, Soon Koo;Choi, Dae-Ki;Row, Kyung Ho
    • Korean Chemical Engineering Research
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    • v.43 no.2
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    • pp.230-235
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    • 2005
  • Reversed-phase high-performance liquid chromatography (RP-HPLC) was used to determine the equilibrium isotherm of single and multi-components of dUrd(2'-deoxyuridine), dGuo(2'-deoxyguanosine), and dAdo(2'-deoxyadenosine) of 2'-deoxyribonucleosides by dynamic method. The composition of mobile phase was 90/10 vol.% (water/MeOH). With an increase in the injection volumes, the retention times were shorter and the peak shapes were triangle-shaped, so Langmuir-type isotherm was assumed. The Langmuir adsorption parameters were estimated by PIM (pulsed-input method), and the competitive Langmuir adsorption isotherm was further utilized. For the sample of the dUrd and dGuo whose retention times were relatively short, the agreement of between the calculated value and experimental data was fairly good in both single and multi-components, but for the dAdo, the last eluting component, some deviations were caused by non-linear and non-ideal properties.

Study on Adsoption Characteristics of Tharonil on Activated Carbon Fixed Bed (활성탄 고정층에 대한 Tharonil의 흡착특성에 관한 연구)

  • Lee, Jong-Jip;Yu, Yong-Ho
    • Journal of the Korean Society of Safety
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    • v.17 no.1
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    • pp.54-60
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    • 2002
  • 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 $D_s=2.825{\times}10^{-9}cm^2/s,\;D_p=1.26{\times}10^{-5}cm^2/s$, 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.

Physical Adsorption of Nitrogen Gas on BN, Alumina, and Silica-Gel Powders

  • Cho, Hyun-Woo;Kim, Jung-Soo;Yoo, Eun-Ah;Ahn, Woon-Sun
    • Bulletin of the Korean Chemical Society
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    • v.9 no.4
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    • pp.244-248
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    • 1988
  • Multilayer adsorption isotherms of nitrogen on hexagonal boron nitride, ${\gamma}$-alumina, and silica-gel powders are determined at the liquid nitrogen temperature using a gravimetric adsorption apparatus. The volume (V) of the adsorbed gas are plotted against the statistical thickness(t) of the adsorbed layer, and the t-method area are calculated from the slope of these V-t plots to compare with the BET area. A number of universal adsorption isotherms and the Frenkel-Halsey-Hill equation are used one after another in calculating the statistical thickness. The appropriateness of the FHH equation as an universal adsorption isotherm is discussed finally.

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