• Title/Summary/Keyword: Exchange Resin

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Ion-Exchange Separation of Thorium in Monazite (이온交換樹指에 依한 토리움分離)

  • Choi, Han-Suk;Ha, Young-Gu
    • Journal of the Korean Chemical Society
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    • v.5 no.1
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    • pp.56-59
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    • 1961

  • Ion exchange procedure was studied for the separation of thorium from the acidic solution obtained by means of decomposition of monazite with alkali solution. Present cation exchange method consists of adsorption of cations from the sample solution (ca. 0.6N HCl acidic) onto Amberlite IR-120 resin, elution of all of the rare earth cations with 700 ml. of 2N Hydrochloric acid, and recovery of the thorium by elution with 200ml. of 6N sulfaric acid. Thorium recovery by the ion-exchange method mentioned above, was quantitative, and it is concluded that this ion-exchange method may be used not only for industrial separation of thorium from rare earths but also for quantitative determination of thorium with relative error, ${\pm}1.0.$.

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The microdetection of alkaloids with amberlite IRC-50 (Amberlite IRC-50에 의한 alkaloid의 미량검출법)

  • 김근영;이윤중;손윤자
    • YAKHAK HOEJI
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    • v.11 no.1_2
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    • pp.4-6
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    • 1967

  • Cation exchange resin particles amberlite IRC-50 were used as a medium for a identific test of alkaloids with dragendorff reagent. The procedures were as follows; A few particles of amberlite IRC-50 were added to the small portion of sample solutions on a spot plate or in a test tube. After 20 minutes-an hour, a drop of dragendorff reagent were added to particles of resin that were adsorbed. When alkaloid was present, the original color of the resin particles changed instantly to red or reddish orange depending on the amount and kind of alkaloid, while in the absence of alkaloid the original color of the resin particles changed light yellow. These methods were more sensitive than the ordinary spot test or paper spot test for alkaloid. The limits of identifications of nine alkaloids were tested by these methods and compared with the paper spot test method.

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Preparation of Heterogeneous Bipolar Membranes Using Poly (phenylene oxide, PPO) Polyelectrolyte and Their Water Splitting Properties (Poly (phenylene oxide, PPO) 고분자 전해질을 이용한 불균질 바이폴라막 제조 및 물분해 특성)

  • Kim, In Sik;Hwang, Seong Yeon;Kang, Byung Gwan;Hwang, Taek Sung
    • Korean Chemical Engineering Research
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    • v.57 no.1
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    • pp.65-72
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    • 2019

  • In this study, heterogeneous ion exchange membranes were prepared by casting method with various mixing ratios of PPO ion-selective solution and ion exchange resin. Then heterogeneous bipolar membranes were prepared by using this. The water content of heterogeneous cation and anion exchange membranes were 60~80% respectively, the ion exchange capacity was 2.81~3.26 meq/g, 2.31~2.74 meq/g and electrical resistances were $1.65{\sim}1.45{\Omega}{\cdot}cm^2$ and $1.55{\sim}1.05{\Omega}{\cdot}cm^2$. The tensile strength of heterogeneous bipolar membrane was lower than that of PPO resin before functionalization ($700Kg_f/cm^2$). The tensile strength of heterogeneous bipolar membrane with catalyst layer was lower than that of non-catalytic heterogeneous bipolar membrane. The water splitting voltage of the heterogeneous bipolar membrane with catalyst layer was low and stable at a minimum of 1.7~1.8 V, maximum 3.9~4.0 V, and the water splitting voltage of the non-catalytic heterogeneous bipolar membrane was constant at 3.8~4.0 V.

  • https://doi.org/10.9713/kcer.2019.57.1.65 인용 PDF KSCI HTML

Effects of magnetic ion exchange resin with PACI coagulation on removal of natural organic matter and MF fouling (자성체 이온교환 수지와 PACI 응집에 의한 국내 주요 수계 내 자연유기물 제거 특성 및 막오염 저감 효과)

  • Choi, Yang Hun;Jeong, Young Mi;Kim, Young Sam;Lee, Seung Ryul;Kweon, Ji Hyang;Kwon, Soon Buhm
    • Journal of Korean Society of Water and Wastewater
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    • v.22 no.1
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    • pp.131-140
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    • 2008

  • The application of magnetic ion exchange resin($MIEX^{(R)}$) is effective for natural organic matter(NOM) removal and for control of the formation of disinfection byproducts(DBPs). NOM removal is also enhanced by adding $MIEX^{(R)}$ with coagulant such as polyaluminium chloride(PACl) in conventional drinking water treatment systems. In the application of $MIEX^{(R)}$, it is important to understand changes of NOM characteristics such as hydrophobicity and molecular weight distributions with $MIEX^{(R)}$ or $MIEX^{(R)}$+coagulant treatment.To observe characteristics of NOM by treatment with $MIEX^{(R)}$ or $MIEX^{(R)}$+coagulant, four major drinking water sources were employed. Results showed that the addition of $MIEX^{(R)}$ to coagulation significantly reduced the amount of coagulant required for the optimum removal of dissolved organic matter(DOC) and turbidity in the all four waters. The DOC removal was also increased approximately 20%, compared to coagulant treatment alone. The process with $MIEX^{(R)}$ and coagulant showed that complementary removal of hydrophobic and hydrophilic fraction of DOC. The combined processes preferentially removed the fractions of intermediate (3,000-10,000 Da) and low (< 500 Da) molecular weight. The microfiltration test showed that membrane cake resistance was decreased for waters with flocs from $MIEX^{(R)}$+coagulant. A porous layer was formed to $MIEX^{(R)}$ on the membrane surface and the layer consequently inhibited settling of coagulant flocs, which could act on a foulant.

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