• 제목/요약/키워드: surfactant adsorption

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Interaction of Indigo Carmine with Cetyltrimethylammonium Bromide and Application to Determination of Cationic Surfactant in Wastewater

  • Wang, Hong-Yan;Gao, Hong-Wen;Zhao, Jian-Fu
    • Bulletin of the Korean Chemical Society
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    • v.24 no.10
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    • pp.1444-1448
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    • 2003
  • The microsurface adsorption - spectral correction (MSASC) technique has been applied to the interaction of indigo carmine (IC) with cetyltrimethylammonium bromide (CTAB). The aggregation of IC on CTAB obeys Langmuir isothermal adsorption. The results show that both the monomer complex $IC{\cdot}CTAB$ and the micellar complex $(IC{\cdot}CTAB)_{78}$ were formed. The binding constant of the monomer complex was calculated to be $K_{IC{\cdot}CTAB}$ = 2.20 ${\times}10^5L{\cdot}mol^{-1}$, and the molar absorptivity of the micellar complex was calculated to be ${\varepsilon}_{(IC{\cdot}CTAB)78}\;^{560nm}$ = 8.58 ${\times}10^5L{\cdot}mol^{-1}{\cdot}cm^{-1}$. The aggregation was applied to the determination of cationic surfactant in wastewater.

Effects of the Surfactant and the Quaternary Ammonium Functional Groups on the Removal of Perrhenate Anions using Mesoporous Anion-Exchange Resins in Aqueous Solutions (암모늄 기능기와 계면활성제가 포함된 메조포러스 음이온교환수지를 이용한 수용액중 퍼리네이트(Perrhenate) 음이온 제거)

  • Lee, Byunghwan;Chung, Yeon-Sung;Park, Chulhwan
    • Korean Chemical Engineering Research
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    • v.46 no.2
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    • pp.436-442
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    • 2008
  • Organic-inorganic hybrid mesoporous anion-exchange resins were prepared for the adsorption of anions from aqueous solutions. The prepared samples were characterized using nitrogen adsorption-desorption measurements, Fourier transform infrared (FTIR) spectroscopy, and elemental analyses. Batch and kinetic experiments were performed to examine the anion-exchange performances of the prepared samples. Among the prepared samples, the hybrid mesoporous anion-exchange resins functionalized with tributylammonium groups showed higher adsorption capacities for perrhenate ions than did the resin functionalized with trimethylammonium groups. The surfactant, hexadecylamine, which had hydrophobic alkyl chains, also showed affinity for hydrophobic perrhenate anions.

Characteristics of p-Xylene Adsorption using Functionalized Mesoporous Silica (관능기화 메조포러스 실리카를 이용한 파라자일렌 흡착 특성)

  • Kim, Sang-Hyoun;Park, Jonghoon;Kang, Seok-Tae;Chung, Jae-Woo;Kim, Soo-Hong;Cho, Yunchul;Lee, Chae-Young
    • Journal of the Korean GEO-environmental Society
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    • v.13 no.6
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    • pp.27-31
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    • 2012
  • This study was designed to examine the feasibility of functionalized mesoporous silica as the adsorbent for benzene, toluene, ethylbenzene, and xylene isomers (BTEX) in groundwater. p-Xylene was used as the model compound of BTEX. A series of functionalized mesoporous silica with MCM-41 type of structure was synthesized using a co-condensation method. Monoamine, triamine, nitrile, phenyl, and octyl groups were functionalized to the mesoporous silica structure. Adsorption sites for p-Xylene in a functionalized mesoporous silica were Si-O-Si covalent bond, the surfactant, and the functional group. Octyl-functionalized mesoporous silica with stearyltrimethylammonium chloride as a surfactant showed the highest adsorption ability. The maximum xylene adsorption capacity of the octyl-functionalized mesoporous silica with stearyltrimethylammonium chloride based on Langmuir model was 4.17 mmol/g on $20^{\circ}C$, which was 2.9 times higher than that of MCM-41.

Synthesis of Magnetic Nanoparticles of Fe3O4 and CoFe2O4 and Their Surface Modification by Surfactant Adsorption

  • Zhao, Shi Yong;Lee, Don-Geun;Kim, Chang-Woo;Cha, Hyun-Gil;Kim, Young-Hwan;Kang, Young-Soo
    • Bulletin of the Korean Chemical Society
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    • v.27 no.2
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    • pp.237-242
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    • 2006
  • $Fe_3O_4$ and $CoFe_2O_4$ magnetic nanoparticles have been synthesized successfully in aqueous solution and coated with oleic acid. The solid and organic solution of the synthesized nanoparticles was obtained. Self-assembled monolayer films were formed using organic solution of these nanoparticles. The crystal sizes determined by Debye-Scherre equation with XRD data were found close to the particle sizes calculated from TEM images, and this indicates that the synthesized particles are nanocrystalline. Especially, EDS, ED, FT-IR, TGA/DTA and DSC were used to characterize the nanoparticles and the oleic acid adsorption, and it was found that oleic acid molecule on the $Fe_3O_4$ nanoparticle is a bilayer adsorption, while that on $CoFe_2O_4$ nanoparticle is single layer adsorption. The superparamagnetic behavior of the nanoparticles was documented by the hysteresis loop measured at 300 K.

The Preparation of D-Phenylalanine Imprinted Microbeads by a Novel Method of Modified Suspension Polymerization

  • Khan, Hamayun;Park, Joong-Kon
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.11 no.6
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    • pp.503-509
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    • 2006
  • Molecularly imprinted polymeric microbeads (MIPMs) were prepared by the suspension and modified suspension polymerization methods using D-phenylalanine as the template, methacrylic acid as the functional monomer, ethylene glycol dimethacrylate as the cross-linker, toluene as the porogen, polyvinyl alcohol as the stabilizer, and sodium dodecyl sulfate as the surfactant. The addition of a surfactant to the conventional suspension polymerization mixture decreased the mean particle size of the MIPMs and increased the adsorption selectivity. For the modified suspension polymerization method, the mean particle size of the MIPMs was smaller than the particle size of MIPMs prepared via conventional suspension polymerization. Moreover, the adsorption selectivity improved considerably compared to the adsorption selectivities of MIPs reported previously.

Investigation of the Adsorption Phenomena of Surfactant on Hydrophilic Surface by Spectroscopic Method (분광학적 방법에 의한 계면활성제의 친수성 표면에 대한 흡착양상 연구)

  • Kim, Dong-Su
    • Journal of Korean Society of Environmental Engineers
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    • v.22 no.12
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    • pp.2215-2226
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    • 2000
  • Adsorption characteristics for homologous xanthates on quartz surface has been investigated by FT-IR spectroscopy to understand the adsorption mechanism in relation with verification of the influence of surfactants on the stability of hydrophilic suspended solids in aqueous system. Contact angle measurement for water droplets on quartz surface treated with xanthate was also conducted as a supplementary study for spectroscopic investigation to grant a reliability to the interpretation of experimental results. It has been observed that monolayer of ethyl xanthate was formed on quartz surface as the adsorption progressed and double layer of ethyl xanthate was formed eventually through the reverse oriented adsorption of xanthate molecules on the monolayer. Similar trend of adsorption to the case of ethyl xanthate was found for propyl and butyl xanthates and adsorption was observed to occur more rapidly as the number of carbon atom in alkyl group of xanthate homologs increased. Thermodynamic aspect of adsorption was discussed using Young's equation and the variation in adsorption rate was examined according to the concentration of ethyl xanthate. Based on the result, it has been concluded that the adsorption features of surfactant on substrate in aquatic system is governed by molecular structure and concentration of surfactant and its residual time in aqueous environment as dissolved state also influences greatly the stability of hydrophilic suspended particles.

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Surface modification of silica aerogel by surfactant adsorption and heat treatment methods (계면활성제 흡착 및 열처리를 이용한 실리카 에어로겔의 표면 개질)

  • Kim, Nam-Yi;Kim, Seong-Woo
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.3
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    • pp.282-289
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    • 2010
  • In preparation of silica aerogel-based hybrid coating materials, the combination of hydrophobic aerogel with organic polar binder material is shown to be very limited due to dissimilar surface property between two materials. Accordingly, the surface modification of the aerogel would be required to obtain compatibilized hybrid coating sols with homogeneous dispersion. In this study, the surface of silica aerogel particles was modified by using both surfactant adsorption and heat treatment methods. Four types of surfactants with different molecular weights and HLB values were used to examine the effect of chain length and hydrophilicity. The surface property of the modified aerogel was evaluated in terms of visible observation for aerogel dispersion in water, water contact angle measurement, and FT-IR analysis. In surface modification using surfactants, the effects of surfactant type and content, and mixing time as process parameter on the degree of hydrophilicity for the modified aerogel. In addition, the temperature condition in modification process via heat treatment was revealed to be significant factor to prepare aerogel with highly hydrophilic property.

An Experiment and Numerical Analysis for One-Dimensional Surface Flow (1차원 표면유동에 관한 실험과 수치해석)

  • Byun, Min-Soo;Suh, Yong-Kweon
    • Proceedings of the KSME Conference
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    • 2001.06e
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    • pp.136-141
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    • 2001
  • In this study, we analysed tree surface flow by using the experimental and numerical method with a different surfactant concentration. We compared numerical solution with experimental results for one-dimensional model. The result shows that in general the tree surface velocity can well be reproduced by the one-dimensional model for various surfactant concentration.

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Adsorption of Hydrophobic Fluid by Polyurethane Foam (폴리우레탄 폼을 이용한 친유성 유체의 흡착)

  • Chai, Joo-Byung;Kim, Byung-Kyu;Shin, Young-Jo
    • Applied Chemistry for Engineering
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    • v.9 no.5
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    • pp.648-653
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    • 1998
  • This study examines the effects of cell size and structure on the oil adsorption by polyurethane (PU) foam. A series of oil-adsorptive PU foam has been prepared, using various molecular weight of polyether polyol (GP-1000, GP-3000, GP-4000, GP-5000), together with TDI-80, water and additives. It was found that the cell size of PU foam decreased with increasing the agitation speed and surfactant content. Oil-adsotption of PU foam increased over 2000% with the increase of molecular weight of polyol and with the decrease of cell size. Increase in the surfactant content and the viscosity of adsorbed oil also give a remarkable decrease in oil adsorption.

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Adsorption of MX (3-chloro-4 (dichloromethyl)-5-hydroxy-2-(5H)-furanone) on amphiphilic mesoporous silica in aqueous solution (양쪽성 메조 포러스 실리카에 의한 수용액 속의 MX의 흡착)

  • Yoo, Eun-Ah;Chung, Kang-Sup
    • Analytical Science and Technology
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    • v.24 no.2
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    • pp.94-104
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    • 2011
  • Mesoporous silica was synthesized in a water solvent and in an ethanol solvent with the non and cationic cetyltrimethyl ammonium chloride (CTAC) by varying the amount of the amphiphilic acrylic urethane oligomer (AAU) and the pH of the solution. The adsorption of the MX (3-chloro-4 (dichloromethyl)-5-hydroxy-2-(5H)-furanone) in drinking water was studied using the synthesized mesoporous silica as an adsorbent. The most appropriate silica was synthesized in acidic conditions in the water solvent and in alkali conditions in the ethanol solvent. The average pore sizes of the synthesized mesosilica were 3 nm and more. The mesoporous silica synthesized by the addition of the AAU oligomer showed excellent adsorption characteristics. With respect to the co-surfactant, the best adsorption characteristics were obtained when the P64,a non-ionic surfactant with a high molecular weight, was used to synthesize the silica than when other co-surfactants were used. The adsorption rate decreased as the MX concentration in the water increased. Different adsorption equilibrium conditions were reached depending on the adsorbate MX concentration in the adsorbent and the solution. It was seen that perfect adsorption does not occur due to such equilibrium conditions.