• Title, Summary, Keyword: 몬모릴로나이트

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Comparison of Properties of Natural Ca-Montmorillonite and its Al-pillared Montmorillonites (천연 Ca-몬모릴로나이트와 이로부터 합성된 Al-가교몬모릴로나이트의 특성 비교연구)

  • 이정현;김수진
    • Journal of the Mineralogical Society of Korea
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    • v.15 no.4
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    • pp.273-282
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    • 2002
  • Al-pillared montmorillonite was synthesized from Na-saturated montmorillonite which was prepared by ionic substitution from Ca-montmorillonite of the Jabut mine, Gyeongiu City d(001), surface areas, and dehydration and ionic substitution properties have been compared for both Ca-montmorillonite and Al-pillared montmorillonite. d(001) spacings of Ca-montmorillonite and Al-pillared montmorillonite were 15.1 $\AA$ and $18.3\AA$, respectively. Dehydration took place before $350 ^{\circ}C$ in Ca-montmorillonite, whereas linealy up to $550^{\circ}C$ in Al-pillared montmorillonite. BET surface areas are 5~6 times larger in Al-pillared montmorillonite ($192 \m^2$/g) than Camontmorillonite. Ca-montmorilonite shows high selectivity for $Na^{+}$ /, whereas Al-pillared montmorillonite for $Ca^{2+}$ . The former shows decreasing d(001) spacing with increasing substitution of $Na^{+}$ and irregular interstratified structure at high substitution of $Ca^{2+}$ /, whereas the latter shows linear decreasing pattern in d(001) spacing with increasing $Ca^{ 2+}$.

The Kinetics of Montmorillonite Expansion in the Treatment with Hexadecyltrimethylammonium (HDTMA와 반응하는 몬모릴로나이트의 팽창 속도론)

  • Lee Seung Yeop;Cho Won Jin
    • Journal of the Mineralogical Society of Korea
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    • v.17 no.4
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    • pp.299-307
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    • 2004
  • Surfactant adsorption by two montmorillonite types with different interlayer cations of Ca and Na was characterized by examining the time dependence of surfactant behavior on the clay surfaces. Surfactants with different micelle concentration were conducted in our experiment to observe a nonequilibrium activity of cationic surfactant on the clay over reaction periods ranging from 0.1 min to 11 days. As compared with Ca-montmorillonite (SAz), a more active intrusion of surfactant molecules into the interlayers was found in Na-montmorillonite (SWy). During a short 'initiation' stage, the basal spacing of SWy montmorillonite increased rapidly with logarithmic time. For SAz montmorillonite, however, the abrupt basal spacing increase occurred at the later stage of the reaction. From the result, the difference in the adsorption behavior exhibited by the two montmorillonite types partly results from their intrinsic nature, that is, inorganic cations originally existing on the clay surfaces. Additionally, the micelle concentration of surfactants affects the development of organo-montmorillonite, especially, in the intercalant formation and stabilization under nonequilibrium.

Synthesis and Chnracterization of Organophilic Montmorillonites Modified with Alkyl Siloxane Amino 01igomers (알킬실록산 아민 올리고머 구조를 함유한 친유성 몬모릴로나이트의 제조 및 특성평가)

  • 김효주;김용석;원종찬;이미혜;최길영
    • Polymer Korea
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    • v.27 no.2
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    • pp.135-141
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    • 2003
  • A series of organophilic montmorillonites (MMTs) modified with various alkyl siloxane amino oligomer groups have been synthesized and their properties were investigated. New organophilic MMTs containing siloxane amino oligomers with alkyl group instead of conventional alkyl amines were synthesized to improve thermal stability as well as gallery spacing. The organophilic MMTs were synthesized from MMT by utilizing the siloxane amino oligomers with various alkyl groups in the water/dioxane solution, which was performed without aq. HCl. Thermal decomposition temperature, gallery spacing, and hydrophobicity of synthesized organophilic MMTs were investigated. X-ray diffraction and TEM experiment results on new organophilic MMTs demonstrated that introduction of siloxane amine oligomers increased d-spacing between silicate layers. The decomposition temperatures of new organophilic MMTs measured by TGA was remarkably improved above 200℃ as compared with those of conventional alkyl substituted organophilic MMTs.

Fundamental Studies on the Characteristics of the Surface Electrokinetic Behavior of Particulate Matter as an Extensive Property (입자성 물질의 크기성질로서의 표면 전기적 특성 규명에 대한 기초연구)

  • O, Se-Jin;Kim, Dong-Su
    • Journal of Korean Society of Environmental Engineers
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    • v.32 no.6
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    • pp.581-586
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    • 2010
  • Generally, electrokinetic potential has been considered as an intensive property. In other words, electrokinetic potential is not affected by the amount of particulate matter. Montmorillonite, one of essential inorganic matter, was chosen to measure electrokinetic potential. The result of electrokinetic potential measuring experiment showed that the value observed to decrease as the amount of montmorillonite clay increased. This is due to the fact that total ions that adsorbed per unit mass were decreased as the amount of montmorillonite was increased. As a result, electrokinetic potential is considered as an extensive property. By using these results, total interaction energy of suspension was also checked, and revealed that total interaction energy was decreased as the amount of montmorillonite increased.

Structural Properties of Epoxy-Montmorillonite Nanocomposites (몬모릴로나이트와 에폭시수지로부터 합성된 나노복합재료의 구조적 특성에 관한 연구)

  • Sur, Gil-Soo;Ryu, Joung-Gul;Lyu, Sung-Gyu;Choi, Hyun-Kuk;Kim, Bong-Sik
    • Applied Chemistry for Engineering
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    • v.10 no.4
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    • pp.615-619
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    • 1999
  • Polyether-clay nanocomposite was not polymerized with stearyltrimethylammonium ion exchanged montmorillonite, but it was self-polymerizable when heated with both stearyltrimethylammpmoim and m-phenylenediammonium ions intercalated montmorillonite to form polyether-clay nanocomposites. Molcular disperion of montmorillonite within the crosslinked epoxy matrix verified using X-ray diffraction and transmission electron microscopy found that the final product contains a uniform dispersion of exfoliated $10{\AA}$ thin clay layers seperated by $250{\sim}500{\AA}$of polyether polymer, thus verifying the nanocomposite structure.

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Synthesis and Characterization of Organophilic Montmorillonites Modified with Various Alkyl Substituents (다양한 구조의 알킬기를 함유한 친유성 몬모릴로나이트의 제조 및 특성 연구)

  • 심종천;김용운;원종찬;최길영;이미혜
    • Polymer Korea
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    • v.27 no.2
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    • pp.129-134
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    • 2003
  • It has been known that the intercalation of long alkyl chains in montmorillonites (MMT) increased the hydrophobicity as well as gallery spacing of UT, which has influenced on the exfoliation behavior of various polymers. A series of organophilic MMTs were synthesized from the water/isopropyl alcohol solution of MMT with ammonium salts of various alkyl amines. The properties of obtained MMTs such as thermal decomposition temperature, gallery spacing as well as hydrophobic property were investigated. The X-ray diffraction experiments on organophilic montmorillonite demonstrated that the increase of length of alkyl substituent resulted in increase in the spacing between silicate layers, which was ranged from 13.1 to 29.4 $\AA$. On the other hand, introduction of (di-, tri-) alkyl substituents in ammonium salts decreased water absorption of organophiplic montmorillonite to 2.7%.

The Electrocatalytic Reduction of Molecular Oxygen with Clay Modified Electrodes (점토광물을 이용한 산소환원의 전기화학적 촉매성에 관한 연구)

  • Oh Sung-Hun;Hwang Jin-Yeon;Shim Yoon-Bo;Lee Hyomin;Yoon Jihae
    • Journal of the Mineralogical Society of Korea
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    • v.18 no.1
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    • pp.1-9
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    • 2005
  • The electrocatalytic reduction of O₂ was investigated with methyl viologen and methylene blue incorporated clay-modified electrodes. Clay suspensions were prepared with Na-montmorillonite, Ca-montmorillonite, and kaolinite. The methyl viologen-clay modified electrodes were made by coating clay suspensions adsorbing methyl viologen on a glassy carbon electrode. Cyclic voltammetry were performed in aqueous media to investigate the electrocatalytic property of the modified electrode in reducing O₂. A Na-montmorillonite modified electrode showed the greatest adsorption capacity for methyl viologen. The modified electrode made of Na-montmorillonite suspension of 0.87 g/10 mL and a 2.5 mM of methyl viologen solution showed the most effective electrocatalytic property, where the catalytic reduction potential was shifted by 242.6 mV toward the positive potential. The electrocatalytic ability was more significant in acidic (pH=3.7) and alkaline (pH=12.7) media than the neutral pH range (6.3∼8.3). The methyl viologen-Na-montmorillonite modified electrode had the good reproducibility and maintain the electrocatalytic property over 20 times reuse.

A Study of Intercalations-complex of Montmorillonite as Model-system (V) (Model-System으로서의 몬트모릴로나이트의 층간화합물에 한 연구(V))

  • Sung-Jun Cho
    • The Journal of Engineering Research
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    • v.6 no.2
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    • pp.119-124
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    • 2004
  • In this research montmorillonite intercalations complexes as organophilic clay compounds which have very different properties as the starting clay mineral were synthesized by the substitution of metal ions which exist in the montmorillonite layers with the organic cations which have long alkyl chain by the cation exchange reaction. Thereafter the obtained products dried in high vacuum were treated with the various swelling liquids such as dist. water, methanol, acetone, ether and acetonitrile in order to know the swelling behaviour of the synthesized complexes. Especially for this research Korean and Turkish clays were selected to compare the intercalations complexes of both clays and their swelling behaviour.

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Assesment of Zeolite, Montmorillonite, and Steel Slag for Interrupting Heavy Metals Release from Contaminated Marine Sediments for Capping Thickness of Reactive materials (오염된 해양퇴적물에서 중금속 용출 차단을 위한 제올라이트, 몬모릴로나이트, 제강슬래그의 적용성 평가)

  • Kang, Ku;Kim, Young-Kee;Park, Seong-Jik
    • Journal of Navigation and Port Research
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    • v.39 no.4
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    • pp.335-344
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    • 2015
  • This study aims to assess the effectiveness of zeolite, montmorillonite, and steel slag as capping materials to block the release of heavy metals from marine sediment depending on their depths. The results showed that all capping materials used this study were not effective in interrupting release of As. Zeolite had negative effect on the block of Cr release but it was significantly reduced to 5 cm by montmorillonite capping. In contrast to As and Cr, Cd, Ni, and Pb were not released even from uncapped sediments. Cu and Zn were the heavy metals those were most significantly influenced by the capping conditions. Cu release from marine sediments were effectively blocked by more than 1 cm depth of montmorillonite and more than 3 cm depth of zeolite. All capping materials were found to be effective in interrupting release of Zn from marine sediments. It was concluded that the zeolite, montmorillonite, and steel slag could be used as a potential capping material for interrupting the release of Cr, Cu, and Zn from the contaminated marine sediments.

Application of Montmorillonite as Capping Material for Blocking of Phosphate Release from Contaminated Marine Sediment (해양오염퇴적물 내 인산염 용출차단을 위한 피복소재로서의 몬모릴로나이트 적용)

  • Kang, Ku;Kim, Young-Kee;Hong, Seong-Gu;Kim, Han-Joong;Park, Seong-Jik
    • Journal of Korean Society of Environmental Engineers
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    • v.36 no.8
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    • pp.554-560
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    • 2014
  • To investigate the applicability of montmorillonite to capping material for the remediation of contaminated marine sediment, adsorption characteristics of $PO{_4}{^{3-}}$ onto montmorillonite were studied in a batch system with respect to changes in contact time, initial concentration, pH, adsorbent dose amount, competing anions, adsorbent mixture, and seawater. Sorption equilibrium reached in 1 h at 50 mg/L but 3 h was required to reach sorption equilibrium at 300 mg/L. Freundlich model was more suitable to describe equilibrium sorption data than Langmuir model. The $PO{_4}{^{3-}}$ adsorption decreased as pH increased, due to the $PO{_4}{^{3-}}$ competition for favorable adsorption site with OH- at higher pH. The presence of anions such as nitrate, sulfate, and bicarbonate had no significant effect on the $PO{_4}{^{3-}}$ adsorption onto the montmorillonite. The use of the montmorillonite alone was more effective for the removal of the $PO{_4}{^{3-}}$ than mixing the montmorillonite with red mud and steel slag. The $PO{_4}{^{3-}}$ adsorption capacity of the montmorillonite was higher in seawater than deionized water, resulting from the presence of calcium ion in seawater. The water tank elution experiments showed that montmorillonite capping blocked well the elution of $PO{_4}{^{3-}}$, which was not measured up to 14 days. It was concluded that the montmirillonite has a potential capping material for the removal of the $PO{_4}{^{3-}}$ from the aqueous solutions.